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1522 lines
105 KiB
1522 lines
105 KiB
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html lang="en-US-x-Hixie" ><head><title>5 Loading Web pages — HTML5 </title><style type="text/css">
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pre { margin-left: 2em; white-space: pre-wrap; }
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h2 { margin: 3em 0 1em 0; }
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h3 { margin: 2.5em 0 1em 0; }
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h4 { margin: 2.5em 0 0.75em 0; }
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h5, h6 { margin: 2.5em 0 1em; }
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h1 + h2, h1 + h2 + h2 { margin: 0.75em 0 0.75em; }
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h2 + h3, h3 + h4, h4 + h5, h5 + h6 { margin-top: 0.5em; }
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p { margin: 1em 0; }
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hr:not(.top) { display: block; background: none; border: none; padding: 0; margin: 2em 0; height: auto; }
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dl, dd { margin-top: 0; margin-bottom: 0; }
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dt { margin-top: 0.75em; margin-bottom: 0.25em; clear: left; }
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dt + dt { margin-top: 0; }
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dd dt { margin-top: 0.25em; margin-bottom: 0; }
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dd p { margin-top: 0; }
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dd dl + p { margin-top: 1em; }
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dd table + p { margin-top: 1em; }
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p + * > li, dd li { margin: 1em 0; }
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dt, dfn { font-weight: bold; font-style: normal; }
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dt dfn { font-style: italic; }
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pre, code { font-size: inherit; font-family: monospace; font-variant: normal; }
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pre strong { color: black; font: inherit; font-weight: bold; background: yellow; }
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pre em { font-weight: bolder; font-style: normal; }
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@media screen { code { color: orangered; } code :link, code :visited { color: inherit; } }
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var sub { vertical-align: bottom; font-size: smaller; position: relative; top: 0.1em; }
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table { border-collapse: collapse; border-style: hidden hidden none hidden; }
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table thead, table tbody { border-bottom: solid; }
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table tbody th:first-child { border-left: solid; }
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table tbody th { text-align: left; }
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table td, table th { border-left: solid; border-right: solid; border-bottom: solid thin; vertical-align: top; padding: 0.2em; }
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blockquote { margin: 0 0 0 2em; border: 0; padding: 0; font-style: italic; }
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.bad, .bad *:not(.XXX) { color: gray; border-color: gray; background: transparent; }
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.matrix, .matrix td { border: none; text-align: right; }
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.matrix { margin-left: 2em; }
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.dice-example { border-collapse: collapse; border-style: hidden solid solid hidden; border-width: thin; margin-left: 3em; }
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.dice-example caption { width: 30em; font-size: smaller; font-style: italic; padding: 0.75em 0; text-align: left; }
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.dice-example td, .dice-example th { border: solid thin; width: 1.35em; height: 1.05em; text-align: center; padding: 0; }
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.toc dfn, h1 dfn, h2 dfn, h3 dfn, h4 dfn, h5 dfn, h6 dfn { font: inherit; }
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img.extra { float: right; }
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pre.idl { border: solid thin; background: #EEEEEE; color: black; padding: 0.5em 1em; }
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pre.idl :link, pre.idl :visited { color: inherit; background: transparent; }
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pre.css { border: solid thin; background: #FFFFEE; color: black; padding: 0.5em 1em; }
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pre.css:first-line { color: #AAAA50; }
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dl.domintro { color: green; margin: 2em 0 2em 2em; padding: 0.5em 1em; border: none; background: #DDFFDD; }
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hr + dl.domintro, div.impl + dl.domintro { margin-top: 2.5em; margin-bottom: 1.5em; }
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dl.domintro dt, dl.domintro dt * { color: black; text-decoration: none; }
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dl.domintro dd { margin: 0.5em 0 1em 2em; padding: 0; }
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dl.domintro dd p { margin: 0.5em 0; }
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dl.switch { padding-left: 2em; }
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dl.switch > dt { text-indent: -1.5em; }
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dl.switch > dt:before { content: '\21AA'; padding: 0 0.5em 0 0; display: inline-block; width: 1em; text-align: right; line-height: 0.5em; }
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dl.triple { padding: 0 0 0 1em; }
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dl.triple dt, dl.triple dd { margin: 0; display: inline }
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dl.triple dt:after { content: ':'; }
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dl.triple dd:after { content: '\A'; white-space: pre; }
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.diff-old { text-decoration: line-through; color: silver; background: transparent; }
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.diff-chg, .diff-new { text-decoration: underline; color: green; background: transparent; }
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a .diff-new { border-bottom: 1px blue solid; }
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h2 { page-break-before: always; }
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h1, h2, h3, h4, h5, h6 { page-break-after: avoid; }
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h1 + h2, hr + h2.no-toc { page-break-before: auto; }
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p > span:not([title=""]):not([class="XXX"]):not([class="impl"]):not([class="note"]),
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li > span:not([title=""]):not([class="XXX"]):not([class="impl"]):not([class="note"]), { border-bottom: solid #9999CC; }
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div.head { margin: 0 0 1em; padding: 1em 0 0 0; }
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div.head p { margin: 0; }
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div.head h1 { margin: 0; }
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div.head .logo { float: right; margin: 0 1em; }
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div.head .logo img { border: none } /* remove border from top image */
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div.head dl { margin: 1em 0; }
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div.head p.copyright, div.head p.alt { font-size: x-small; font-style: oblique; margin: 0; }
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body > .toc > li { margin-top: 1em; margin-bottom: 1em; }
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body > .toc.brief > li { margin-top: 0.35em; margin-bottom: 0.35em; }
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body > .toc > li > * { margin-bottom: 0.5em; }
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body > .toc > li > * > li > * { margin-bottom: 0.25em; }
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.toc, .toc li { list-style: none; }
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.brief { margin-top: 1em; margin-bottom: 1em; line-height: 1.1; }
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.brief li { margin: 0; padding: 0; }
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.brief li p { margin: 0; padding: 0; }
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.category-list { margin-top: -0.75em; margin-bottom: 1em; line-height: 1.5; }
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.category-list::before { content: '\21D2\A0'; font-size: 1.2em; font-weight: 900; }
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.category-list li { display: inline; }
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.category-list li:not(:last-child)::after { content: ', '; }
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.category-list li > span, .category-list li > a { text-transform: lowercase; }
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.category-list li * { text-transform: none; } /* don't affect <code> nested in <a> */
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.XXX { color: #E50000; background: white; border: solid red; padding: 0.5em; margin: 1em 0; }
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.XXX > :first-child { margin-top: 0; }
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p .XXX { line-height: 3em; }
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.annotation { border: solid thin black; background: #0C479D; color: white; position: relative; margin: 8px 0 20px 0; }
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.annotation:before { position: absolute; left: 0; top: 0; width: 100%; height: 100%; margin: 6px -6px -6px 6px; background: #333333; z-index: -1; content: ''; }
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.annotation :link, .annotation :visited { color: inherit; }
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.annotation :link:hover, .annotation :visited:hover { background: transparent; }
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.annotation span { border: none ! important; }
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.note { color: green; background: transparent; font-family: sans-serif; }
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.warning { color: red; background: transparent; }
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.note, .warning { font-weight: bolder; font-style: italic; }
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p.note, div.note { padding: 0.5em 2em; }
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span.note { padding: 0 2em; }
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.note p:first-child, .warning p:first-child { margin-top: 0; }
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.note p:last-child, .warning p:last-child { margin-bottom: 0; }
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.warning:before { font-style: normal; }
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p.note:before { content: 'Note: '; }
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p.warning:before { content: '\26A0 Warning! '; }
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.bookkeeping:before { display: block; content: 'Bookkeeping details'; font-weight: bolder; font-style: italic; }
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.bookkeeping { font-size: 0.8em; margin: 2em 0; }
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.bookkeeping p { margin: 0.5em 2em; display: list-item; list-style: square; }
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.bookkeeping dt { margin: 0.5em 2em 0; }
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.bookkeeping dd { margin: 0 3em 0.5em; }
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h4 { position: relative; z-index: 3; }
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h4 + .element, h4 + div + .element { margin-top: -2.5em; padding-top: 2em; }
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.element {
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background: #EEEEFF;
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color: black;
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margin: 0 0 1em 0.15em;
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padding: 0 1em 0.25em 0.75em;
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border-left: solid #9999FF 0.25em;
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position: relative;
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z-index: 1;
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}
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.element:before {
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position: absolute;
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z-index: 2;
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top: 0;
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left: -1.15em;
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height: 2em;
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width: 0.9em;
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background: #EEEEFF;
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content: ' ';
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border-style: none none solid solid;
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border-color: #9999FF;
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border-width: 0.25em;
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}
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.example { display: block; color: #222222; background: #FCFCFC; border-left: double; margin-left: 2em; padding-left: 1em; }
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td > .example:only-child { margin: 0 0 0 0.1em; }
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ul.domTree, ul.domTree ul { padding: 0 0 0 1em; margin: 0; }
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ul.domTree li { padding: 0; margin: 0; list-style: none; position: relative; }
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ul.domTree li li { list-style: none; }
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ul.domTree li:first-child::before { position: absolute; top: 0; height: 0.6em; left: -0.75em; width: 0.5em; border-style: none none solid solid; content: ''; border-width: 0.1em; }
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ul.domTree li:not(:last-child)::after { position: absolute; top: 0; bottom: -0.6em; left: -0.75em; width: 0.5em; border-style: none none solid solid; content: ''; border-width: 0.1em; }
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ul.domTree span { font-style: italic; font-family: serif; }
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ul.domTree .t1 code { color: purple; font-weight: bold; }
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ul.domTree .t2 { font-style: normal; font-family: monospace; }
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ul.domTree .t2 .name { color: black; font-weight: bold; }
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ul.domTree .t2 .value { color: blue; font-weight: normal; }
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ul.domTree .t3 code, .domTree .t4 code, .domTree .t5 code { color: gray; }
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ul.domTree .t7 code, .domTree .t8 code { color: green; }
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ul.domTree .t10 code { color: teal; }
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body.dfnEnabled dfn { cursor: pointer; }
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.dfnPanel {
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display: inline;
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position: absolute;
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z-index: 10;
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height: auto;
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width: auto;
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padding: 0.5em 0.75em;
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font: small sans-serif, Droid Sans Fallback;
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background: #DDDDDD;
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color: black;
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border: outset 0.2em;
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}
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.dfnPanel * { margin: 0; padding: 0; font: inherit; text-indent: 0; }
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.dfnPanel :link, .dfnPanel :visited { color: black; }
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.dfnPanel p { font-weight: bolder; }
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.dfnPanel * + p { margin-top: 0.25em; }
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.dfnPanel li { list-style-position: inside; }
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#configUI { position: absolute; z-index: 20; top: 10em; right: 1em; width: 11em; font-size: small; }
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#configUI p { margin: 0.5em 0; padding: 0.3em; background: #EEEEEE; color: black; border: inset thin; }
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#configUI p label { display: block; }
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#configUI #updateUI, #configUI .loginUI { text-align: center; }
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#configUI input[type=button] { display: block; margin: auto; }
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fieldset { margin: 1em; padding: 0.5em 1em; }
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fieldset > legend + * { margin-top: 0; }
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fieldset > :last-child { margin-bottom: 0; }
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fieldset p { margin: 0.5em 0; }
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.stability {
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position: fixed;
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bottom: 0;
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left: 0; right: 0;
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margin: 0 auto 0 auto !important;
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z-index: 1000;
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width: 50%;
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background: maroon; color: yellow;
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-webkit-border-radius: 1em 1em 0 0;
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-moz-border-radius: 1em 1em 0 0;
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border-radius: 1em 1em 0 0;
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-moz-box-shadow: 0 0 1em #500;
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-webkit-box-shadow: 0 0 1em #500;
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box-shadow: 0 0 1em red;
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padding: 0.5em 1em;
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text-align: center;
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}
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.stability strong {
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display: block;
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}
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.stability input {
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appearance: none; margin: 0; border: 0; padding: 0.25em 0.5em; background: transparent; color: black;
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position: absolute; top: -0.5em; right: 0; font: 1.25em sans-serif; text-align: center;
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}
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.stability input:hover {
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color: white;
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text-shadow: 0 0 2px black;
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}
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.stability input:active {
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padding: 0.3em 0.45em 0.2em 0.55em;
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}
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.stability :link, .stability :visited,
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.stability :link:hover, .stability :visited:hover {
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background: transparent;
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color: white;
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}
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</style><link href="data:text/css,.impl%20%7B%20display:%20none;%20%7D%0Ahtml%20%7B%20border:%20solid%20yellow;%20%7D%20.domintro:before%20%7B%20display:%20none;%20%7D" id="author" rel="alternate stylesheet" title="Author documentation only"><link href="data:text/css,.impl%20%7B%20background:%20%23FFEEEE;%20%7D%20.domintro:before%20%7B%20background:%20%23FFEEEE;%20%7D" id="highlight" rel="alternate stylesheet" title="Highlight implementation
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requirements"><link href="http://www.w3.org/StyleSheets/TR/W3C-WD" rel="stylesheet" type="text/css"><style type="text/css">
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.applies thead th > * { display: block; }
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.applies thead code { display: block; }
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.applies tbody th { whitespace: nowrap; }
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.applies td { text-align: center; }
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.applies .yes { background: yellow; }
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.matrix, .matrix td { border: hidden; text-align: right; }
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.matrix { margin-left: 2em; }
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.dice-example { border-collapse: collapse; border-style: hidden solid solid hidden; border-width: thin; margin-left: 3em; }
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.dice-example caption { width: 30em; font-size: smaller; font-style: italic; padding: 0.75em 0; text-align: left; }
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.dice-example td, .dice-example th { border: solid thin; width: 1.35em; height: 1.05em; text-align: center; padding: 0; }
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td.eg { border-width: thin; text-align: center; }
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#table-example-1 { border: solid thin; border-collapse: collapse; margin-left: 3em; }
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#table-example-1 * { font-family: "Essays1743", serif; line-height: 1.01em; }
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#table-example-1 caption { padding-bottom: 0.5em; }
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#table-example-1 thead, #table-example-1 tbody { border: none; }
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#table-example-1 th, #table-example-1 td { border: solid thin; }
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#table-example-1 th { font-weight: normal; }
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#table-example-1 td { border-style: none solid; vertical-align: top; }
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#table-example-1 th { padding: 0.5em; vertical-align: middle; text-align: center; }
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#table-example-1 tbody tr:first-child td { padding-top: 0.5em; }
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#table-example-1 tbody tr:last-child td { padding-bottom: 1.5em; }
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#table-example-1 tbody td:first-child { padding-left: 2.5em; padding-right: 0; width: 9em; }
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#table-example-1 tbody td:first-child::after { content: leader(". "); }
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#table-example-1 tbody td { padding-left: 2em; padding-right: 2em; }
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#table-example-1 tbody td:first-child + td { width: 10em; }
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#table-example-1 tbody td:first-child + td ~ td { width: 2.5em; }
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#table-example-1 tbody td:first-child + td + td + td ~ td { width: 1.25em; }
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.apple-table-examples { border: none; border-collapse: separate; border-spacing: 1.5em 0em; width: 40em; margin-left: 3em; }
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.apple-table-examples * { font-family: "Times", serif; }
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.apple-table-examples td, .apple-table-examples th { border: none; white-space: nowrap; padding-top: 0; padding-bottom: 0; }
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.apple-table-examples tbody th:first-child { border-left: none; width: 100%; }
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.apple-table-examples thead th:first-child ~ th { font-size: smaller; font-weight: bolder; border-bottom: solid 2px; text-align: center; }
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.apple-table-examples tbody th::after, .apple-table-examples tfoot th::after { content: leader(". ") }
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.apple-table-examples tbody th, .apple-table-examples tfoot th { font: inherit; text-align: left; }
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.apple-table-examples td { text-align: right; vertical-align: top; }
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.apple-table-examples.e1 tbody tr:last-child td { border-bottom: solid 1px; }
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.apple-table-examples.e1 tbody + tbody tr:last-child td { border-bottom: double 3px; }
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.apple-table-examples.e2 th[scope=row] { padding-left: 1em; }
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.apple-table-examples sup { line-height: 0; }
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.details-example img { vertical-align: top; }
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#base64-table {
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white-space: nowrap;
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font-size: 0.6em;
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|
column-width: 6em;
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|
column-count: 5;
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column-gap: 1em;
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-moz-column-width: 6em;
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-moz-column-count: 5;
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-moz-column-gap: 1em;
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-webkit-column-width: 6em;
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|
-webkit-column-count: 5;
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|
-webkit-column-gap: 1em;
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}
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#base64-table thead { display: none; }
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|
#base64-table * { border: none; }
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|
#base64-table tbody td:first-child:after { content: ':'; }
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#base64-table tbody td:last-child { text-align: right; }
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#named-character-references-table {
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white-space: nowrap;
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font-size: 0.6em;
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|
column-width: 30em;
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|
column-gap: 1em;
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-moz-column-width: 30em;
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-moz-column-gap: 1em;
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-webkit-column-width: 30em;
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-webkit-column-gap: 1em;
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}
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#named-character-references-table > table > tbody > tr > td:first-child + td,
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#named-character-references-table > table > tbody > tr > td:last-child { text-align: center; }
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#named-character-references-table > table > tbody > tr > td:last-child:hover > span { position: absolute; top: auto; left: auto; margin-left: 0.5em; line-height: 1.2; font-size: 5em; border: outset; padding: 0.25em 0.5em; background: white; width: 1.25em; height: auto; text-align: center; }
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#named-character-references-table > table > tbody > tr#entity-CounterClockwiseContourIntegral > td:first-child { font-size: 0.5em; }
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.glyph.control { color: red; }
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@font-face {
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font-family: 'Essays1743';
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src: url('http://www.whatwg.org/specs/web-apps/current-work/fonts/Essays1743.ttf');
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}
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@font-face {
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font-family: 'Essays1743';
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|
font-weight: bold;
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|
src: url('http://www.whatwg.org/specs/web-apps/current-work/fonts/Essays1743-Bold.ttf');
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}
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@font-face {
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font-family: 'Essays1743';
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|
font-style: italic;
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|
src: url('http://www.whatwg.org/specs/web-apps/current-work/fonts/Essays1743-Italic.ttf');
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}
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@font-face {
|
|
font-family: 'Essays1743';
|
|
font-style: italic;
|
|
font-weight: bold;
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src: url('http://www.whatwg.org/specs/web-apps/current-work/fonts/Essays1743-BoldItalic.ttf');
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}
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</style><style type="text/css">
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.domintro:before { display: table; margin: -1em -0.5em -0.5em auto; width: auto; content: 'This box is non-normative. Implementation requirements are given below this box.'; color: black; font-style: italic; border: solid 2px; background: white; padding: 0 0.25em; }
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</style><script type="text/javascript">
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function getCookie(name) {
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var params = location.search.substr(1).split("&");
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for (var index = 0; index < params.length; index++) {
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if (params[index] == name)
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return "1";
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var data = params[index].split("=");
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if (data[0] == name)
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return unescape(data[1]);
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}
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var cookies = document.cookie.split("; ");
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for (var index = 0; index < cookies.length; index++) {
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var data = cookies[index].split("=");
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if (data[0] == name)
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return unescape(data[1]);
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}
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return null;
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}
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</script>
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<script src="link-fixup.js" type="text/javascript"></script>
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<link href="style.css" rel="stylesheet"><link href="links.html" title="4.12 Links" rel="prev">
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<link href="spec.html#contents" title="Table of contents" rel="index">
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<link href="origin-0.html" title="5.3 Origin" rel="next">
|
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</head><body><div class="head" id="head">
|
|
<div id="multipage-common">
|
|
<p class="stability" id="wip"><strong>This is a work in
|
|
progress!</strong> For the latest updates from the HTML WG, possibly
|
|
including important bug fixes, please look at the <a href="http://dev.w3.org/html5/spec/Overview.html">editor's draft</a> instead.
|
|
There may also be a more
|
|
<a href="http://www.w3.org/TR/html5">up-to-date Working Draft</a>
|
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with changes based on resolution of Last Call issues.
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<input onclick="closeWarning(this.parentNode)" type="button" value="╳⃝"></p>
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<script type="text/javascript">
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function closeWarning(element) {
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element.parentNode.removeChild(element);
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var date = new Date();
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date.setDate(date.getDate()+4);
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document.cookie = 'hide-obsolescence-warning=1; expires=' + date.toGMTString();
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}
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if (getCookie('hide-obsolescence-warning') == '1')
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setTimeout(function () { document.getElementById('wip').parentNode.removeChild(document.getElementById('wip')); }, 2000);
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</script></div>
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<p><a href="http://www.w3.org/"><img alt="W3C" height="48" src="http://www.w3.org/Icons/w3c_home" width="72"></a></p>
|
|
|
|
<h1>HTML5</h1>
|
|
</div><div>
|
|
<a href="links.html" class="prev">4.12 Links</a> –
|
|
<a href="spec.html#contents">Table of contents</a> –
|
|
<a href="origin-0.html" class="next">5.3 Origin</a>
|
|
<ol class="toc"><li><a href="browsers.html#browsers"><span class="secno">5 </span>Loading Web pages</a>
|
|
<ol><li><a href="browsers.html#windows"><span class="secno">5.1 </span>Browsing contexts</a>
|
|
<ol><li><a href="browsers.html#nested-browsing-contexts"><span class="secno">5.1.1 </span>Nested browsing contexts</a>
|
|
<ol><li><a href="browsers.html#navigating-nested-browsing-contexts-in-the-dom"><span class="secno">5.1.1.1 </span>Navigating nested browsing contexts in the DOM</a></li></ol></li><li><a href="browsers.html#auxiliary-browsing-contexts"><span class="secno">5.1.2 </span>Auxiliary browsing contexts</a>
|
|
<ol><li><a href="browsers.html#navigating-auxiliary-browsing-contexts-in-the-dom"><span class="secno">5.1.2.1 </span>Navigating auxiliary browsing contexts in the DOM</a></li></ol></li><li><a href="browsers.html#secondary-browsing-contexts"><span class="secno">5.1.3 </span>Secondary browsing contexts</a></li><li><a href="browsers.html#security-nav"><span class="secno">5.1.4 </span>Security</a></li><li><a href="browsers.html#groupings-of-browsing-contexts"><span class="secno">5.1.5 </span>Groupings of browsing contexts</a></li><li><a href="browsers.html#browsing-context-names"><span class="secno">5.1.6 </span>Browsing context names</a></li></ol></li><li><a href="browsers.html#the-window-object"><span class="secno">5.2 </span>The <code>Window</code> object</a>
|
|
<ol><li><a href="browsers.html#security-window"><span class="secno">5.2.1 </span>Security</a></li><li><a href="browsers.html#apis-for-creating-and-navigating-browsing-contexts-by-name"><span class="secno">5.2.2 </span>APIs for creating and navigating browsing contexts by name</a></li><li><a href="browsers.html#accessing-other-browsing-contexts"><span class="secno">5.2.3 </span>Accessing other browsing contexts</a></li><li><a href="browsers.html#named-access-on-the-window-object"><span class="secno">5.2.4 </span>Named access on the <code>Window</code> object</a></li><li><a href="browsers.html#garbage-collection-and-browsing-contexts"><span class="secno">5.2.5 </span>Garbage collection and browsing contexts</a></li><li><a href="browsers.html#browser-interface-elements"><span class="secno">5.2.6 </span>Browser interface elements</a></li><li><a href="browsers.html#the-windowproxy-object"><span class="secno">5.2.7 </span>The <code>WindowProxy</code> object</a></li></ol></li></ol></li></ol></div>
|
|
|
|
<h2 id="browsers"><span class="secno">5 </span>Loading Web pages</h2><div class="impl">
|
|
|
|
<p>This section describes features that apply most directly to Web
|
|
browsers. Having said that, except where specified otherwise, the
|
|
requirements defined in this section <em>do</em> apply to all user
|
|
agents, whether they are Web browsers or not.</p>
|
|
|
|
</div><h3 id="windows"><span class="secno">5.1 </span>Browsing contexts</h3><p>A <dfn id="browsing-context">browsing context</dfn> is an environment in which
|
|
<code><a href="infrastructure.html#document">Document</a></code> objects are presented to the user.</p><p class="note">A tab or window in a Web browser typically contains
|
|
a <a href="#browsing-context">browsing context</a>, as does an <code><a href="the-iframe-element.html#the-iframe-element">iframe</a></code><span class="impl"> or <code><a href="obsolete.html#frame">frame</a></code>s in a
|
|
<code><a href="obsolete.html#frameset">frameset</a></code></span>.</p><p>Each <a href="#browsing-context">browsing context</a> has a corresponding
|
|
<code><a href="#windowproxy">WindowProxy</a></code> object.</p><p>A <a href="#browsing-context">browsing context</a> has a <a href="history.html#session-history">session
|
|
history</a>, which lists the <code><a href="infrastructure.html#document">Document</a></code> objects that
|
|
that <a href="#browsing-context">browsing context</a> has presented, is presenting, or
|
|
will present. At any time, one <code><a href="infrastructure.html#document">Document</a></code> in each
|
|
<a href="#browsing-context">browsing context</a> is designated the <dfn id="active-document">active
|
|
document</dfn>.</p><p>Each <code><a href="infrastructure.html#document">Document</a></code> is associated with a
|
|
<code><a href="#window">Window</a></code> object. A <a href="#browsing-context">browsing context</a>'s
|
|
<code><a href="#windowproxy">WindowProxy</a></code> object forwards everything to the
|
|
<a href="#browsing-context">browsing context</a>'s <a href="#active-document">active document</a>'s
|
|
<code><a href="#window">Window</a></code> object.</p><p class="note">In general, there is a 1-to-1 mapping from the
|
|
<code><a href="#window">Window</a></code> object to the <code><a href="infrastructure.html#document">Document</a></code> object. In
|
|
one particular case, a <code><a href="#window">Window</a></code> can be reused for the
|
|
presentation of a second <code><a href="infrastructure.html#document">Document</a></code> in the same
|
|
<a href="#browsing-context">browsing context</a>, such that the mapping is then
|
|
2-to-1. This occurs when a <a href="#browsing-context">browsing context</a> is <a href="history.html#navigate" title="navigate">navigated</a> from the initial
|
|
<code><a href="fetching-resources.html#about:blank">about:blank</a></code> <code><a href="infrastructure.html#document">Document</a></code> to another, with
|
|
<a href="history.html#replacement-enabled">replacement enabled</a>.</p><p class="note">A <code><a href="infrastructure.html#document">Document</a></code> does not necessarily have a
|
|
<a href="#browsing-context">browsing context</a> associated with it. In particular,
|
|
data mining tools are likely to never instantiate browsing
|
|
contexts.</p><hr><p>A <a href="#browsing-context">browsing context</a> can have a <dfn id="creator-browsing-context">creator browsing
|
|
context</dfn>, the <a href="#browsing-context">browsing context</a> that was
|
|
responsible for its creation. If a <a href="#browsing-context">browsing context</a> has
|
|
a <a href="#parent-browsing-context">parent browsing context</a>, then that is its
|
|
<a href="#creator-browsing-context">creator browsing context</a>. Otherwise, if the
|
|
<a href="#browsing-context">browsing context</a> has an <a href="#opener-browsing-context">opener browsing
|
|
context</a>, then <em>that</em> is its <a href="#creator-browsing-context">creator browsing
|
|
context</a>. Otherwise, the <a href="#browsing-context">browsing context</a> has no
|
|
<a href="#creator-browsing-context">creator browsing context</a>.</p><p>If a <a href="#browsing-context">browsing context</a> <var title="">A</var> has a
|
|
<a href="#creator-browsing-context">creator browsing context</a>, then the
|
|
<code><a href="infrastructure.html#document">Document</a></code> that was the <a href="#active-document">active document</a> of
|
|
that <a href="#creator-browsing-context">creator browsing context</a> at the time <var title="">A</var> was created is the <dfn id="creator-document">creator
|
|
<code>Document</code></dfn>.</p><div class="impl">
|
|
|
|
<p>When a <a href="#browsing-context">browsing context</a> is first created, it must be
|
|
created with a single <code><a href="infrastructure.html#document">Document</a></code> in its session history,
|
|
whose <a href="dom.html#the-document-s-address" title="the document's address">address</a> is
|
|
<code><a href="fetching-resources.html#about:blank">about:blank</a></code>, which is marked as being an <a href="dom.html#html-documents" title="HTML documents">HTML document</a>, and whose <a href="dom.html#document-s-character-encoding" title="document's character encoding">character encoding</a> is
|
|
UTF-8. The <code><a href="infrastructure.html#document">Document</a></code> must have a single child
|
|
<code><a href="semantics.html#the-html-element">html</a></code> node, which itself has a single child
|
|
<code><a href="sections.html#the-body-element">body</a></code> node.</p>
|
|
|
|
<p class="note">If the <a href="#browsing-context">browsing context</a> is created
|
|
specifically to be immediately navigated, then that initial
|
|
navigation will have <a href="history.html#replacement-enabled">replacement enabled</a>.</p>
|
|
|
|
<p id="about-blank-origin">The <a href="origin-0.html#origin">origin</a> of the
|
|
<code><a href="fetching-resources.html#about:blank">about:blank</a></code> <code><a href="infrastructure.html#document">Document</a></code> is set when the
|
|
<code><a href="infrastructure.html#document">Document</a></code> is created. If the new <a href="#browsing-context">browsing
|
|
context</a> has a <a href="#creator-browsing-context">creator browsing context</a>, then the
|
|
<a href="origin-0.html#origin">origin</a> of the <code><a href="fetching-resources.html#about:blank">about:blank</a></code>
|
|
<code><a href="infrastructure.html#document">Document</a></code> is the <a href="origin-0.html#origin">origin</a> of the
|
|
<a href="#creator-document">creator <code>Document</code></a>. Otherwise, the
|
|
<a href="origin-0.html#origin">origin</a> of the <code><a href="fetching-resources.html#about:blank">about:blank</a></code>
|
|
<code><a href="infrastructure.html#document">Document</a></code> is a globally unique identifier assigned when
|
|
the new <a href="#browsing-context">browsing context</a> is created.</p>
|
|
|
|
</div><h4 id="nested-browsing-contexts"><span class="secno">5.1.1 </span>Nested browsing contexts</h4><p>Certain elements (for example, <code><a href="the-iframe-element.html#the-iframe-element">iframe</a></code> elements) can
|
|
instantiate further <a href="#browsing-context" title="browsing context">browsing
|
|
contexts</a>. These are called <dfn id="nested-browsing-context" title="nested browsing
|
|
context">nested browsing contexts</dfn>. If a browsing context <var title="">P</var> has a <code><a href="infrastructure.html#document">Document</a></code>s <var title="">D</var>
|
|
with an element <var title="">E</var> that nests another browsing
|
|
context <var title="">C</var> inside it, then <var title="">C</var>
|
|
is said to be <dfn id="browsing-context-nested-through" title="browsing context nested through">nested
|
|
through</dfn> <var title="">D</var>, and <var title="">E</var> is
|
|
said to be the <dfn id="browsing-context-container">browsing context container</dfn> of <var title="">C</var>. If the <a href="#browsing-context-container">browsing context container</a>
|
|
element <var title="">E</var> is <a href="infrastructure.html#in-a-document" title="in a
|
|
Document">in</a> the <code><a href="infrastructure.html#document">Document</a></code> <var title="">D</var>,
|
|
then <var title="">P</var> is said to be the <dfn id="parent-browsing-context">parent browsing
|
|
context</dfn> of <var title="">C</var> and <var title="">C</var> is
|
|
said to be a <dfn id="child-browsing-context">child browsing context</dfn> of <var title="">P</var>. Otherwise, the <a href="#nested-browsing-context">nested browsing
|
|
context</a> <var title="">C</var> has no <a href="#parent-browsing-context">parent browsing
|
|
context</a>.</p><p>A browsing context <var title="">A</var> is said to be an <dfn id="ancestor-browsing-context" title="ancestor browsing context">ancestor</dfn> of a browsing
|
|
context <var title="">B</var> if there exists a browsing context
|
|
<var title="">A'</var> that is a <a href="#child-browsing-context">child browsing context</a>
|
|
of <var title="">A</var> and that is itself an <a href="#ancestor-browsing-context" title="ancestor
|
|
browsing context">ancestor</a> of <var title="">B</var>, or if
|
|
there is a browsing context <var title="">P</var> that is a
|
|
<a href="#child-browsing-context">child browsing context</a> of <var title="">A</var> and
|
|
that is the <a href="#parent-browsing-context">parent browsing context</a> of <var title="">B</var>.</p><p>A browsing context that is not a <a href="#nested-browsing-context">nested browsing
|
|
context</a> has no <a href="#parent-browsing-context">parent browsing context</a>, and is
|
|
the <dfn id="top-level-browsing-context">top-level browsing context</dfn> of all the browsing
|
|
contexts for which it is an <a href="#ancestor-browsing-context">ancestor browsing
|
|
context</a>.</p><p>The transitive closure of <a href="#parent-browsing-context" title="parent browsing
|
|
context">parent browsing contexts</a> for a <a href="#nested-browsing-context">nested browsing
|
|
context</a> gives the list of <a href="#ancestor-browsing-context" title="ancestor browsing
|
|
context">ancestor browsing contexts</a>.</p><p>The <dfn id="list-of-the-descendant-browsing-contexts">list of the descendant browsing contexts</dfn> of a
|
|
<code><a href="infrastructure.html#document">Document</a></code> <var title="">d</var> is the (ordered) list
|
|
returned by the following algorithm:</p><ol><li><p>Let <var title="">list</var> be an empty list.</p></li>
|
|
|
|
<li>
|
|
|
|
<p>For each <a href="#child-browsing-context">child browsing context</a> of <var title="">d</var> that is <a href="#browsing-context-nested-through" title="browsing context nested
|
|
through">nested through</a> an element that is <a href="infrastructure.html#in-a-document" title="in
|
|
a document">in the <code>Document</code></a> <var title="">d</var>, in the <a href="infrastructure.html#tree-order">tree order</a> of the elements
|
|
nesting those <a href="#browsing-context" title="browsing context">browsing
|
|
contexts</a>, run these substeps:</p>
|
|
|
|
<ol><li><p>Append that <a href="#child-browsing-context">child browsing context</a> to the
|
|
list <var title="">list</var>.</p>
|
|
|
|
</li><li><p>Append the <a href="#list-of-the-descendant-browsing-contexts">list of the descendant browsing
|
|
contexts</a> of the <a href="#active-document">active document</a> of that
|
|
<a href="#child-browsing-context">child browsing context</a> to the list <var title="">list</var>.</p></li>
|
|
|
|
</ol></li>
|
|
|
|
<li><p>Return the constructed <var title="">list</var>.</p></li>
|
|
|
|
</ol><p>A <code><a href="infrastructure.html#document">Document</a></code> is said to be <dfn id="fully-active">fully active</dfn>
|
|
when it is the <a href="#active-document">active document</a> of its <a href="#browsing-context">browsing
|
|
context</a>, and either its browsing context is a <a href="#top-level-browsing-context">top-level
|
|
browsing context</a>, or it has a <a href="#parent-browsing-context">parent browsing
|
|
context</a> and the <code><a href="infrastructure.html#document">Document</a></code> <a href="#browsing-context-nested-through" title="browsing
|
|
context nested through">through which</a> it is <a href="#nested-browsing-context" title="nested browsing context">nested</a> is itself <a href="#fully-active">fully
|
|
active</a>.</p><p>Because they are nested through an element, <a href="#child-browsing-context" title="child
|
|
browsing context">child browsing contexts</a> are always tied to
|
|
a specific <code><a href="infrastructure.html#document">Document</a></code> in their <a href="#parent-browsing-context">parent browsing
|
|
context</a>. User agents must not allow the user to interact with
|
|
<a href="#child-browsing-context" title="child browsing context">child browsing contexts</a>
|
|
of elements that are in <code><a href="infrastructure.html#document">Document</a></code>s that are not
|
|
themselves <a href="#fully-active">fully active</a>.</p><p>A <a href="#nested-browsing-context">nested browsing context</a> can have a <a href="the-iframe-element.html#seamless-browsing-context-flag">seamless
|
|
browsing context flag</a> set, if it is embedded through an
|
|
<code><a href="the-iframe-element.html#the-iframe-element">iframe</a></code> element with a <code title="attr-iframe-seamless"><a href="the-iframe-element.html#attr-iframe-seamless">seamless</a></code> attribute.</p><p class="note">A <a href="#nested-browsing-context">nested browsing context</a> can in some
|
|
cases be taken out of its <a href="#parent-browsing-context">parent browsing context</a> (e.g.
|
|
if an <code><a href="the-iframe-element.html#the-iframe-element">iframe</a></code> element is removed from its
|
|
<code><a href="infrastructure.html#document">Document</a></code>). In such a situation, the <a href="#nested-browsing-context">nested
|
|
browsing context</a> has no <a href="#parent-browsing-context">parent browsing context</a>,
|
|
but it still has the same <a href="#browsing-context-container">browsing context container</a>
|
|
and is still <a href="#browsing-context-nested-through" title="browsing context nested through">nested
|
|
through</a> that element's <code><a href="infrastructure.html#document">Document</a></code>. Such a
|
|
<a href="#nested-browsing-context">nested browsing context</a> is <em>not</em> a
|
|
<a href="#top-level-browsing-context">top-level browsing context</a>, and cannot contain
|
|
<code><a href="infrastructure.html#document">Document</a></code>s that are <a href="#fully-active">fully active</a>.
|
|
Furthermore, if a <a href="#browsing-context-container">browsing context container</a> (such as
|
|
an <code><a href="the-iframe-element.html#the-iframe-element">iframe</a></code>) is moved to another <code><a href="infrastructure.html#document">Document</a></code>,
|
|
then the <a href="#parent-browsing-context">parent browsing context</a> of its <a href="#nested-browsing-context">nested
|
|
browsing context</a> will change.</p><h5 id="navigating-nested-browsing-contexts-in-the-dom"><span class="secno">5.1.1.1 </span>Navigating nested browsing contexts in the DOM</h5><dl class="domintro"><dt><var title="">window</var> . <code title="dom-top"><a href="#dom-top">top</a></code></dt>
|
|
|
|
<dd>
|
|
|
|
<p>Returns the <code><a href="#windowproxy">WindowProxy</a></code> for the <a href="#top-level-browsing-context">top-level browsing context</a>.</p>
|
|
|
|
</dd>
|
|
|
|
<dt><var title="">window</var> . <code title="dom-parent"><a href="#dom-parent">parent</a></code></dt>
|
|
|
|
<dd>
|
|
|
|
<p>Returns the <code><a href="#windowproxy">WindowProxy</a></code> for the <a href="#parent-browsing-context">parent browsing context</a>.</p>
|
|
|
|
</dd>
|
|
|
|
<dt><var title="">window</var> . <code title="dom-frameElement"><a href="#dom-frameelement">frameElement</a></code></dt>
|
|
|
|
<dd>
|
|
|
|
<p>Returns the <code><a href="infrastructure.html#element">Element</a></code> for the <a href="#browsing-context-container">browsing context container</a>.</p>
|
|
|
|
<p>Returns null if there isn't one.</p>
|
|
|
|
<p>Throws a <code><a href="common-dom-interfaces.html#security_err">SECURITY_ERR</a></code> exception in cross-origin situations.</p>
|
|
|
|
</dd>
|
|
|
|
</dl><div class="impl">
|
|
|
|
<p>The <dfn id="dom-top" title="dom-top"><code>top</code></dfn> IDL attribute on
|
|
the <code><a href="#window">Window</a></code> object of a <code><a href="infrastructure.html#document">Document</a></code> in a
|
|
<a href="#browsing-context">browsing context</a> <var title="">b</var> must return the
|
|
<code><a href="#windowproxy">WindowProxy</a></code> object of its <a href="#top-level-browsing-context">top-level browsing
|
|
context</a> (which would be its own <code><a href="#windowproxy">WindowProxy</a></code>
|
|
object if it was a <a href="#top-level-browsing-context">top-level browsing context</a> itself),
|
|
if it has one, or its own <code><a href="#windowproxy">WindowProxy</a></code> object otherwise
|
|
(e.g. if it was a detached <a href="#nested-browsing-context">nested browsing
|
|
context</a>).</p>
|
|
|
|
<p>The <dfn id="dom-parent" title="dom-parent"><code>parent</code></dfn> IDL
|
|
attribute on the <code><a href="#window">Window</a></code> object of a
|
|
<code><a href="infrastructure.html#document">Document</a></code> in a <a href="#browsing-context">browsing context</a> <var title="">b</var> must return the <code><a href="#windowproxy">WindowProxy</a></code> object of
|
|
the <a href="#parent-browsing-context">parent browsing context</a>, if there is one (i.e. if
|
|
<var title="">b</var> is a <a href="#child-browsing-context">child browsing context</a>), or
|
|
the <code><a href="#windowproxy">WindowProxy</a></code> object of the <a href="#browsing-context">browsing
|
|
context</a> <var title="">b</var> itself, otherwise (i.e. if it
|
|
is a <a href="#top-level-browsing-context">top-level browsing context</a> or a detached
|
|
<a href="#nested-browsing-context">nested browsing context</a>).</p>
|
|
|
|
<p>The <dfn id="dom-frameelement" title="dom-frameElement"><code>frameElement</code></dfn>
|
|
IDL attribute on the <code><a href="#window">Window</a></code> object of a
|
|
<code><a href="infrastructure.html#document">Document</a></code> <var title="">d</var>, on getting, must run
|
|
the following algorithm:</p>
|
|
|
|
<ol><li><p>If <var title="">d</var> is not a <code><a href="infrastructure.html#document">Document</a></code> in a
|
|
<a href="#nested-browsing-context">nested browsing context</a>, return null and abort these
|
|
steps.</p></li>
|
|
|
|
<li><p>If the <a href="#browsing-context-container">browsing context container</a>'s
|
|
<code><a href="infrastructure.html#document">Document</a></code> does not have the <a href="origin-0.html#same-origin" title="same
|
|
origin">same</a> <a href="origin-0.html#effective-script-origin">effective script origin</a> as the
|
|
<a href="#entry-script">entry script</a>, then throw a <code><a href="common-dom-interfaces.html#security_err">SECURITY_ERR</a></code>
|
|
exception.</p></li>
|
|
|
|
<li><p>Otherwise, return the <a href="#browsing-context-container">browsing context
|
|
container</a> for <var title="">b</var>.</p></li>
|
|
|
|
</ol></div><h4 id="auxiliary-browsing-contexts"><span class="secno">5.1.2 </span>Auxiliary browsing contexts</h4><p>It is possible to create new browsing contexts that are related
|
|
to a <a href="#top-level-browsing-context">top-level browsing context</a> without being nested
|
|
through an element. Such browsing contexts are called <dfn id="auxiliary-browsing-context" title="auxiliary browsing context">auxiliary browsing
|
|
contexts</dfn>. Auxiliary browsing contexts are always <a href="#top-level-browsing-context" title="top-level browsing context">top-level browsing
|
|
contexts</a>.</p><p>An <a href="#auxiliary-browsing-context">auxiliary browsing context</a> has an <dfn id="opener-browsing-context">opener
|
|
browsing context</dfn>, which is the <a href="#browsing-context">browsing context</a>
|
|
from which the <a href="#auxiliary-browsing-context">auxiliary browsing context</a> was
|
|
created.</p><h5 id="navigating-auxiliary-browsing-contexts-in-the-dom"><span class="secno">5.1.2.1 </span>Navigating auxiliary browsing contexts in the DOM</h5><p>The <dfn id="dom-opener" title="dom-opener"><code>opener</code></dfn> IDL
|
|
attribute on the <code><a href="#window">Window</a></code> object, on getting, must return
|
|
the <code><a href="#windowproxy">WindowProxy</a></code> object of the <a href="#browsing-context">browsing
|
|
context</a> from which the current <a href="#browsing-context">browsing context</a>
|
|
was created (its <a href="#opener-browsing-context">opener browsing context</a>), if there is
|
|
one, if it is still available, and if the current <a href="#browsing-context">browsing
|
|
context</a> has not <i><a href="#disowned-its-opener">disowned its opener</a></i>. On setting, if
|
|
the new value is null then the current <a href="#browsing-context">browsing context</a>
|
|
must <dfn id="disowned-its-opener" title="disowned its opener">disown its opener</dfn>; if
|
|
the new value is anything else then the user agent must ignore the
|
|
new value.</p><h4 id="secondary-browsing-contexts"><span class="secno">5.1.3 </span>Secondary browsing contexts</h4><p>User agents may support <dfn id="secondary-browsing-context" title="secondary browsing
|
|
context">secondary browsing contexts</dfn>, which are <a href="#browsing-context" title="browsing context">browsing contexts</a> that form part of
|
|
the user agent's interface, apart from the main content area.</p><div class="impl">
|
|
|
|
<h4 id="security-nav"><span class="secno">5.1.4 </span>Security</h4>
|
|
|
|
<p id="security-1">A <a href="#browsing-context">browsing context</a> <var title="">A</var> is <dfn id="allowed-to-navigate">allowed to navigate</dfn> a second
|
|
<a href="#browsing-context">browsing context</a> <var title="">B</var> if one of the
|
|
following conditions is true:</p>
|
|
|
|
<ul><li>Either the <a href="origin-0.html#origin">origin</a> of the <a href="#active-document">active
|
|
document</a> of <var title="">A</var> is the <a href="origin-0.html#same-origin" title="same
|
|
origin">same</a> as the <a href="origin-0.html#origin">origin</a> of the <a href="#active-document">active
|
|
document</a> of <var title="">B</var>, or</li>
|
|
|
|
<li>The browsing context <var title="">A</var> is a <a href="#nested-browsing-context">nested
|
|
browsing context</a> with a <a href="#top-level-browsing-context">top-level browsing
|
|
context</a>, and its <a href="#top-level-browsing-context">top-level browsing context</a> is
|
|
<var title="">B</var>, or</li>
|
|
|
|
<li>The browsing context <var title="">B</var> is an
|
|
<a href="#auxiliary-browsing-context">auxiliary browsing context</a> and <var title="">A</var>
|
|
is <a href="#allowed-to-navigate">allowed to navigate</a> <var title="">B</var>'s
|
|
<a href="#opener-browsing-context">opener browsing context</a>, or</li>
|
|
|
|
<li>The browsing context <var title="">B</var> is not a
|
|
<a href="#top-level-browsing-context">top-level browsing context</a>, but there exists an
|
|
<a href="#ancestor-browsing-context">ancestor browsing context</a> of <var title="">B</var>
|
|
whose <a href="#active-document">active document</a> has the <a href="origin-0.html#same-origin" title="same
|
|
origin">same</a> <a href="origin-0.html#origin">origin</a> as the <a href="#active-document">active
|
|
document</a> of <var title="">A</var> (possibly in fact being
|
|
<var title="">A</var> itself).</li>
|
|
|
|
</ul><hr><p>An element has a <dfn id="browsing-context-scope-origin">browsing context scope origin</dfn> if its
|
|
<code><a href="infrastructure.html#document">Document</a></code>'s <a href="#browsing-context">browsing context</a> is a
|
|
<a href="#top-level-browsing-context">top-level browsing context</a> or if all of its
|
|
<code><a href="infrastructure.html#document">Document</a></code>'s <a href="#ancestor-browsing-context" title="ancestor browsing
|
|
context">ancestor browsing contexts</a> all have <a href="#active-document" title="active document">active documents</a> whose
|
|
<a href="origin-0.html#origin">origin</a> are the <a href="origin-0.html#same-origin">same origin</a> as the
|
|
element's <code><a href="infrastructure.html#document">Document</a></code>'s <a href="origin-0.html#origin">origin</a>. If an element
|
|
has a <a href="#browsing-context-scope-origin">browsing context scope origin</a>, then its value is
|
|
the <a href="origin-0.html#origin">origin</a> of the element's <code><a href="infrastructure.html#document">Document</a></code>.</p>
|
|
|
|
</div><div class="impl">
|
|
|
|
<h4 id="groupings-of-browsing-contexts"><span class="secno">5.1.5 </span>Groupings of browsing contexts</h4>
|
|
|
|
<p>Each <a href="#browsing-context">browsing context</a> is defined as having a list of
|
|
one or more <dfn id="directly-reachable-browsing-contexts">directly reachable browsing contexts</dfn>. These
|
|
are:</p>
|
|
|
|
<ul><li>The <a href="#browsing-context">browsing context</a> itself.</li>
|
|
|
|
<li>All the <a href="#browsing-context">browsing context</a>'s <a href="#child-browsing-context" title="child
|
|
browsing context">child browsing contexts</a>.</li>
|
|
|
|
<li>The <a href="#browsing-context">browsing context</a>'s <a href="#parent-browsing-context">parent browsing
|
|
context</a>.</li>
|
|
|
|
<li>All the <a href="#browsing-context" title="browsing context">browsing contexts</a>
|
|
that have the <a href="#browsing-context">browsing context</a> as their <a href="#opener-browsing-context">opener
|
|
browsing context</a>.</li>
|
|
|
|
<li>The <a href="#browsing-context">browsing context</a>'s <a href="#opener-browsing-context">opener browsing
|
|
context</a>.</li>
|
|
|
|
</ul><p>The transitive closure of all the <a href="#browsing-context" title="browsing
|
|
context">browsing contexts</a> that are <a href="#directly-reachable-browsing-contexts">directly reachable
|
|
browsing contexts</a> forms a <dfn id="unit-of-related-browsing-contexts">unit of related browsing
|
|
contexts</dfn>.</p>
|
|
|
|
<p>Each <a href="#unit-of-related-browsing-contexts">unit of related browsing contexts</a> is then
|
|
further divided into the smallest number of groups such that every
|
|
member of each group has an <a href="#active-document">active document</a> with an
|
|
<a href="origin-0.html#effective-script-origin">effective script origin</a> that, through appropriate
|
|
manipulation of the <code title="dom-document-domain"><a href="origin-0.html#dom-document-domain">document.domain</a></code> attribute, could
|
|
be made to be the same as other members of the group, but could not
|
|
be made the same as members of any other group. Each such group is a
|
|
<dfn id="unit-of-related-similar-origin-browsing-contexts">unit of related similar-origin browsing contexts</dfn>.</p>
|
|
|
|
<p>Each <a href="#unit-of-related-similar-origin-browsing-contexts">unit of related similar-origin browsing
|
|
contexts</a> can have a <dfn id="entry-script">entry script</dfn> which is used to
|
|
obtain, amongst other things, the <a href="webappapis.html#script-s-base-url">script's base URL</a> to
|
|
<a href="urls.html#resolve-a-url" title="resolve a url">resolve</a> relative <a href="urls.html#url" title="URL">URLs</a> used in scripts running in that <a href="#unit-of-related-similar-origin-browsing-contexts">unit
|
|
of related similar-origin browsing contexts</a>. Initially, there
|
|
is no <a href="#entry-script">entry script</a>. It is changed by the <a href="webappapis.html#jump-to-a-code-entry-point">jump to
|
|
a code entry-point</a> algorithm.</p>
|
|
|
|
<p class="note">There is at most one <a href="webappapis.html#event-loop">event loop</a> per
|
|
<a href="#unit-of-related-similar-origin-browsing-contexts">unit of related similar-origin browsing contexts</a>.</p>
|
|
|
|
</div><h4 id="browsing-context-names"><span class="secno">5.1.6 </span>Browsing context names</h4><p>Browsing contexts can have a <dfn id="browsing-context-name">browsing context name</dfn>. By
|
|
default, a browsing context has no name (its name is not set).</p><p>A <dfn id="valid-browsing-context-name">valid browsing context name</dfn> is any string with at
|
|
least one character that does not start with a U+005F LOW LINE
|
|
character. (Names starting with an underscore are reserved for
|
|
special keywords.)</p><p>A <dfn id="valid-browsing-context-name-or-keyword">valid browsing context name or keyword</dfn> is any string
|
|
that is either a <a href="#valid-browsing-context-name">valid browsing context name</a> or that is
|
|
an <a href="infrastructure.html#ascii-case-insensitive">ASCII case-insensitive</a> match for one of: <code title="">_blank</code>, <code title="">_self</code>, <code title="">_parent</code>, or <code title="">_top</code>.</p><div class="impl">
|
|
|
|
<p><dfn id="the-rules-for-choosing-a-browsing-context-given-a-browsing-context-name">The rules for choosing a browsing context given a browsing
|
|
context name</dfn> are as follows. The rules assume that they are
|
|
being applied in the context of a <a href="#browsing-context">browsing context</a>.</p>
|
|
|
|
<ol><li>
|
|
|
|
<p>If the given browsing context name is the empty string or <code title="">_self</code>, then the chosen browsing context must be
|
|
the current one.</p>
|
|
|
|
<p>If the given browsing context name is <code title="">_self</code>, then this is an <dfn id="explicit-self-navigation-override">explicit
|
|
self-navigation override</dfn>, which overrides the behavior of
|
|
the <a href="the-iframe-element.html#seamless-browsing-context-flag">seamless browsing context flag</a> set by the <code title="attr-iframe-seamless"><a href="the-iframe-element.html#attr-iframe-seamless">seamless</a></code> attribute on
|
|
<code><a href="the-iframe-element.html#the-iframe-element">iframe</a></code> elements.</p>
|
|
|
|
</li>
|
|
|
|
<li><p>If the given browsing context name is <code title="">_parent</code>, then the chosen browsing context must be
|
|
the <a href="#parent-browsing-context"><em>parent</em> browsing context</a> of the current
|
|
one, unless there isn't one, in which case the chosen browsing
|
|
context must be the current browsing context.</p></li>
|
|
|
|
<li><p>If the given browsing context name is <code title="">_top</code>, then the chosen browsing context must be the
|
|
<a href="#top-level-browsing-context">top-level browsing context</a> of the current one, if
|
|
there is one, or else the current browsing context.</p></li>
|
|
|
|
<li>
|
|
|
|
<p>If the given browsing context name is not <code title="">_blank</code> and there exists a browsing context whose
|
|
<a href="#browsing-context-name" title="browsing context name">name</a> is the same as the
|
|
given browsing context name, and the current browsing context is
|
|
<a href="#allowed-to-navigate">allowed to navigate</a> that browsing context, and the
|
|
user agent determines that the two browsing contexts are related
|
|
enough that it is ok if they reach each other, then that browsing
|
|
context must be the chosen one. If there are multiple matching
|
|
browsing contexts, the user agent should select one in some
|
|
arbitrary consistent manner, such as the most recently opened,
|
|
most recently focused, or more closely related.</p>
|
|
|
|
<p>If the browsing context is chosen by this step to be the
|
|
current browsing context, then this is also an <a href="#explicit-self-navigation-override">explicit
|
|
self-navigation override</a>.</p>
|
|
|
|
</li>
|
|
|
|
<li>
|
|
|
|
<p>Otherwise, a new browsing context is being requested, and what
|
|
happens depends on the user agent's configuration and/or
|
|
abilities:</p>
|
|
|
|
<dl><dt id="sandboxWindowOpen">If the current browsing context had
|
|
the <a href="the-iframe-element.html#sandboxed-navigation-browsing-context-flag">sandboxed navigation browsing context flag</a> set
|
|
when its <a href="#active-document">active document</a> was created.</dt>
|
|
|
|
<dd><p>The user agent may offer to create a new <a href="#top-level-browsing-context">top-level
|
|
browsing context</a> or reuse an existing <a href="#top-level-browsing-context">top-level
|
|
browsing context</a>. If the user picks one of those options,
|
|
then the designated browsing context must be the chosen one (the
|
|
browsing context's name isn't set to the given browsing context
|
|
name). Otherwise (if the user agent doesn't offer the option to
|
|
the user, or if the user declines to allow a browsing context to
|
|
be used) there must not be a chosen browsing context.</p></dd>
|
|
|
|
|
|
<dt id="noopener">If the user agent has been configured such that
|
|
in this instance it will create a new browsing context, and the
|
|
browsing context is being requested as part of <a href="links.html#following-hyperlinks" title="following hyperlinks">following a hyperlink</a> whose
|
|
<a href="links.html#linkTypes">link types</a> include the <code title="rel-noreferrer"><a href="links.html#link-type-noreferrer">noreferrer</a></code> keyword</dt>
|
|
|
|
<dd><p>A new <a href="#top-level-browsing-context">top-level browsing context</a> must be
|
|
created. If the given browsing context name is not <code title="">_blank</code>, then the new top-level browsing context's
|
|
name must be the given browsing context name (otherwise, it has
|
|
no name). The chosen browsing context must be this new browsing
|
|
context.</p>
|
|
|
|
<p class="note">If it is immediately <a href="history.html#navigate" title="navigate">navigated</a>, then the navigation will be
|
|
done with <a href="history.html#replacement-enabled">replacement enabled</a>.</p></dd>
|
|
|
|
|
|
<dt>If the user agent has been configured such that in this
|
|
instance it will create a new browsing context, and the <code title="rel-noreferrer"><a href="links.html#link-type-noreferrer">noreferrer</a></code> keyword doesn't
|
|
apply</dt>
|
|
|
|
<dd><p>A new <a href="#auxiliary-browsing-context">auxiliary browsing context</a> must be
|
|
created, with the <a href="#opener-browsing-context">opener browsing context</a> being the
|
|
current one. If the given browsing context name is not <code title="">_blank</code>, then the new auxiliary browsing context's
|
|
name must be the given browsing context name (otherwise, it has
|
|
no name). The chosen browsing context must be this new browsing
|
|
context.</p>
|
|
|
|
<p class="note">If it is immediately <a href="history.html#navigate" title="navigate">navigated</a>, then the navigation will be
|
|
done with <a href="history.html#replacement-enabled">replacement enabled</a>.</p></dd>
|
|
|
|
|
|
<dt>If the user agent has been configured such that in this
|
|
instance it will reuse the current browsing context</dt>
|
|
|
|
<dd><p>The chosen browsing context is the current browsing
|
|
context.</p></dd>
|
|
|
|
|
|
<dt>If the user agent has been configured such that in this
|
|
instance it will not find a browsing context</dt>
|
|
|
|
<dd><p>There must not be a chosen browsing context.</p></dd>
|
|
|
|
</dl><p>User agent implementors are encouraged to provide a way for
|
|
users to configure the user agent to always reuse the current
|
|
browsing context.</p>
|
|
|
|
</li>
|
|
|
|
</ol></div><h3 id="the-window-object"><span class="secno">5.2 </span>The <code><a href="#window">Window</a></code> object</h3><pre class="idl">[ReplaceableNamedProperties]
|
|
interface <dfn id="window">Window</dfn> {
|
|
// the current browsing context
|
|
readonly attribute <a href="#windowproxy">WindowProxy</a> <a href="#dom-window" title="dom-window">window</a>;
|
|
readonly attribute <a href="#windowproxy">WindowProxy</a> <a href="#dom-self" title="dom-self">self</a>;
|
|
readonly attribute <a href="infrastructure.html#document">Document</a> <a href="#dom-document" title="dom-document">document</a>;
|
|
attribute DOMString <a href="#dom-name" title="dom-name">name</a>;
|
|
[PutForwards=<a href="history.html#dom-location-href" title="dom-location-href">href</a>] readonly attribute <a href="history.html#location">Location</a> <a href="history.html#dom-location" title="dom-location">location</a>;
|
|
readonly attribute <a href="history.html#history-0">History</a> <a href="history.html#dom-history" title="dom-history">history</a>;
|
|
[Replaceable] readonly attribute <a href="#barprop">BarProp</a> <a href="#dom-window-locationbar" title="dom-window-locationbar">locationbar</a>;
|
|
[Replaceable] readonly attribute <a href="#barprop">BarProp</a> <a href="#dom-window-menubar" title="dom-window-menubar">menubar</a>;
|
|
[Replaceable] readonly attribute <a href="#barprop">BarProp</a> <a href="#dom-window-personalbar" title="dom-window-personalbar">personalbar</a>;
|
|
[Replaceable] readonly attribute <a href="#barprop">BarProp</a> <a href="#dom-window-scrollbars" title="dom-window-scrollbars">scrollbars</a>;
|
|
[Replaceable] readonly attribute <a href="#barprop">BarProp</a> <a href="#dom-window-statusbar" title="dom-window-statusbar">statusbar</a>;
|
|
[Replaceable] readonly attribute <a href="#barprop">BarProp</a> <a href="#dom-window-toolbar" title="dom-window-toolbar">toolbar</a>; void <a href="#dom-window-close" title="dom-window-close">close</a>();
|
|
void <a href="#dom-window-stop" title="dom-window-stop">stop</a>();
|
|
void <a href="editing.html#dom-window-focus" title="dom-window-focus">focus</a>();
|
|
void <a href="editing.html#dom-window-blur" title="dom-window-blur">blur</a>();
|
|
|
|
// other browsing contexts
|
|
[Replaceable] readonly attribute <a href="#windowproxy">WindowProxy</a> <a href="#dom-frames" title="dom-frames">frames</a>;
|
|
[Replaceable] readonly attribute unsigned long <a href="#dom-length" title="dom-length">length</a>;
|
|
readonly attribute <a href="#windowproxy">WindowProxy</a> <a href="#dom-top" title="dom-top">top</a>;
|
|
attribute <a href="#windowproxy">WindowProxy</a> <a href="#dom-opener" title="dom-opener">opener</a>;
|
|
readonly attribute <a href="#windowproxy">WindowProxy</a> <a href="#dom-parent" title="dom-parent">parent</a>;
|
|
readonly attribute <a href="infrastructure.html#element">Element</a> <a href="#dom-frameelement" title="dom-frameElement">frameElement</a>;
|
|
<a href="#windowproxy">WindowProxy</a> <a href="#dom-open" title="dom-open">open</a>(in optional DOMString url, in optional DOMString target, in optional DOMString features, in optional DOMString replace);
|
|
<a href="#dom-window-item" title="dom-window-item">getter</a> <a href="#windowproxy">WindowProxy</a> (in unsigned long index);
|
|
<a href="#dom-window-nameditem" title="dom-window-namedItem">getter</a> any (in DOMString name);
|
|
|
|
// the user agent
|
|
readonly attribute <a href="timers.html#navigator">Navigator</a> <a href="timers.html#dom-navigator" title="dom-navigator">navigator</a>;
|
|
readonly attribute <a href="offline.html#applicationcache">ApplicationCache</a> <a href="offline.html#dom-applicationcache" title="dom-applicationCache">applicationCache</a>;
|
|
|
|
// user prompts
|
|
void <a href="timers.html#dom-alert" title="dom-alert">alert</a>(in DOMString message);
|
|
boolean <a href="timers.html#dom-confirm" title="dom-confirm">confirm</a>(in DOMString message);
|
|
DOMString <a href="timers.html#dom-prompt" title="dom-prompt">prompt</a>(in DOMString message, in optional DOMString default);
|
|
void <a href="timers.html#dom-print" title="dom-print">print</a>();
|
|
any <a href="timers.html#dom-showmodaldialog" title="dom-showModalDialog">showModalDialog</a>(in DOMString url, in optional any argument);
|
|
|
|
// <a href="webappapis.html#event-handler-idl-attributes">event handler IDL attributes</a>
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onabort" title="handler-onabort">onabort</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-window-onafterprint" title="handler-window-onafterprint">onafterprint</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-window-onbeforeprint" title="handler-window-onbeforeprint">onbeforeprint</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-window-onbeforeunload" title="handler-window-onbeforeunload">onbeforeunload</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-window-onblur" title="handler-window-onblur">onblur</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-oncanplay" title="handler-oncanplay">oncanplay</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-oncanplaythrough" title="handler-oncanplaythrough">oncanplaythrough</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onchange" title="handler-onchange">onchange</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onclick" title="handler-onclick">onclick</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-oncontextmenu" title="handler-oncontextmenu">oncontextmenu</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-oncuechange" title="handler-oncuechange">oncuechange</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-ondblclick" title="handler-ondblclick">ondblclick</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-ondrag" title="handler-ondrag">ondrag</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-ondragend" title="handler-ondragend">ondragend</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-ondragenter" title="handler-ondragenter">ondragenter</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-ondragleave" title="handler-ondragleave">ondragleave</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-ondragover" title="handler-ondragover">ondragover</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-ondragstart" title="handler-ondragstart">ondragstart</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-ondrop" title="handler-ondrop">ondrop</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-ondurationchange" title="handler-ondurationchange">ondurationchange</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onemptied" title="handler-onemptied">onemptied</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onended" title="handler-onended">onended</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-window-onerror" title="handler-window-onerror">onerror</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-window-onfocus" title="handler-window-onfocus">onfocus</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-window-onhashchange" title="handler-window-onhashchange">onhashchange</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-oninput" title="handler-oninput">oninput</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-oninvalid" title="handler-oninvalid">oninvalid</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onkeydown" title="handler-onkeydown">onkeydown</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onkeypress" title="handler-onkeypress">onkeypress</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onkeyup" title="handler-onkeyup">onkeyup</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-window-onload" title="handler-window-onload">onload</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onloadeddata" title="handler-onloadeddata">onloadeddata</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onloadedmetadata" title="handler-onloadedmetadata">onloadedmetadata</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onloadstart" title="handler-onloadstart">onloadstart</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-window-onmessage" title="handler-window-onmessage">onmessage</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onmousedown" title="handler-onmousedown">onmousedown</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onmousemove" title="handler-onmousemove">onmousemove</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onmouseout" title="handler-onmouseout">onmouseout</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onmouseover" title="handler-onmouseover">onmouseover</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onmouseup" title="handler-onmouseup">onmouseup</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onmousewheel" title="handler-onmousewheel">onmousewheel</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-window-onoffline" title="handler-window-onoffline">onoffline</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-window-ononline" title="handler-window-ononline">ononline</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onpause" title="handler-onpause">onpause</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onplay" title="handler-onplay">onplay</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onplaying" title="handler-onplaying">onplaying</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-window-onpagehide" title="handler-window-onpagehide">onpagehide</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-window-onpageshow" title="handler-window-onpageshow">onpageshow</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-window-onpopstate" title="handler-window-onpopstate">onpopstate</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onprogress" title="handler-onprogress">onprogress</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onratechange" title="handler-onratechange">onratechange</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onreadystatechange" title="handler-onreadystatechange">onreadystatechange</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-window-onredo" title="handler-window-onredo">onredo</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onreset" title="handler-onreset">onreset</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-window-onresize" title="handler-window-onresize">onresize</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onscroll" title="handler-onscroll">onscroll</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onseeked" title="handler-onseeked">onseeked</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onseeking" title="handler-onseeking">onseeking</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onselect" title="handler-onselect">onselect</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onshow" title="handler-onshow">onshow</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onstalled" title="handler-onstalled">onstalled</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-window-onstorage" title="handler-window-onstorage">onstorage</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onsubmit" title="handler-onsubmit">onsubmit</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onsuspend" title="handler-onsuspend">onsuspend</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-ontimeupdate" title="handler-ontimeupdate">ontimeupdate</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-window-onundo" title="handler-window-onundo">onundo</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-window-onunload" title="handler-window-onunload">onunload</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onvolumechange" title="handler-onvolumechange">onvolumechange</a>;
|
|
attribute <a href="webappapis.html#function">Function</a> <a href="webappapis.html#handler-onwaiting" title="handler-onwaiting">onwaiting</a>;
|
|
};
|
|
<a href="#window">Window</a> implements <a href="infrastructure.html#eventtarget">EventTarget</a>;</pre><dl class="domintro"><dt><var title="">window</var> . <code title="dom-window"><a href="#dom-window">window</a></code></dt>
|
|
<dt><var title="">window</var> . <code title="dom-frames"><a href="#dom-frames">frames</a></code></dt>
|
|
<dt><var title="">window</var> . <code title="dom-self"><a href="#dom-self">self</a></code></dt>
|
|
|
|
<dd>
|
|
|
|
<p>These attributes all return <var title="">window</var>.</p>
|
|
|
|
</dd>
|
|
|
|
|
|
<dt><var title="">window</var> . <code title="dom-document"><a href="#dom-document">document</a></code></dt>
|
|
|
|
<dd>
|
|
|
|
<p>Returns the <a href="#active-document">active document</a>.</p>
|
|
|
|
</dd>
|
|
|
|
|
|
<dt><var title="">document</var> . <code title="dom-document-defaultView"><a href="#dom-document-defaultview">defaultView</a></code></dt>
|
|
|
|
<dd>
|
|
|
|
<p>Returns the <code><a href="#window">Window</a></code> object of the <a href="#active-document">active document</a>.</p>
|
|
|
|
</dd>
|
|
|
|
</dl><div class="impl">
|
|
|
|
<p>The <dfn id="dom-window" title="dom-window"><code>window</code></dfn>, <dfn id="dom-frames" title="dom-frames"><code>frames</code></dfn>, and <dfn id="dom-self" title="dom-self"><code>self</code></dfn> IDL attributes must all
|
|
return the <code><a href="#window">Window</a></code> object's <a href="#browsing-context">browsing
|
|
context</a>'s <code><a href="#windowproxy">WindowProxy</a></code> object.</p>
|
|
|
|
<p>The <dfn id="dom-document" title="dom-document"><code>document</code></dfn> IDL
|
|
attribute must return the <code><a href="infrastructure.html#document">Document</a></code> object of the
|
|
<code><a href="#window">Window</a></code> object's <code><a href="infrastructure.html#document">Document</a></code>'s <a href="#browsing-context">browsing
|
|
context</a>'s <a href="#active-document">active document</a>.</p>
|
|
|
|
<p>The <dfn id="dom-document-defaultview" title="dom-document-defaultView"><code>defaultView</code></dfn> IDL
|
|
attribute of the <code><a href="dom.html#htmldocument">HTMLDocument</a></code> interface must return the
|
|
<code><a href="infrastructure.html#document">Document</a></code>'s <a href="#browsing-context">browsing context</a>'s
|
|
<code><a href="#windowproxy">WindowProxy</a></code> object, if there is one, or null
|
|
otherwise.</p>
|
|
|
|
</div><div class="impl">
|
|
|
|
<h4 id="security-window"><span class="secno">5.2.1 </span>Security</h4>
|
|
|
|
<p id="security-2">User agents must raise a
|
|
<code><a href="common-dom-interfaces.html#security_err">SECURITY_ERR</a></code> exception whenever any of the members of a
|
|
<code><a href="#window">Window</a></code> object are accessed by scripts whose
|
|
<a href="origin-0.html#effective-script-origin">effective script origin</a> is not the same as the
|
|
<code><a href="#window">Window</a></code> object's <code><a href="infrastructure.html#document">Document</a></code>'s <a href="origin-0.html#effective-script-origin">effective
|
|
script origin</a>, with the following exceptions:</p>
|
|
|
|
<ul><li>The <code title="dom-location"><a href="history.html#dom-location">location</a></code> object
|
|
|
|
</li><li>The <code title="dom-window-postMessage">postMessage()</code> method
|
|
|
|
</li><li>The <code title="dom-frames"><a href="#dom-frames">frames</a></code> attribute
|
|
|
|
</li><li>The <a href="#dynamic-nested-browsing-context-properties">dynamic nested browsing context properties</a>
|
|
|
|
</li></ul><p>When a script whose <a href="origin-0.html#effective-script-origin">effective script origin</a> is not
|
|
the same as the <code><a href="#window">Window</a></code> object's <code><a href="infrastructure.html#document">Document</a></code>'s
|
|
<a href="origin-0.html#effective-script-origin">effective script origin</a> attempts to access that
|
|
<code><a href="#window">Window</a></code> object's methods or attributes, the user agent
|
|
must act as if any changes to the <code><a href="#window">Window</a></code> object's
|
|
properties, getters, setters, etc, were not present.</p>
|
|
|
|
<p>For members that return objects (including function objects),
|
|
each distinct <a href="origin-0.html#effective-script-origin">effective script origin</a> that is not the
|
|
same as the <code><a href="#window">Window</a></code> object's <code><a href="infrastructure.html#document">Document</a></code>'s
|
|
<a href="origin-0.html#effective-script-origin">effective script origin</a> must be provided with a
|
|
separate set of objects. These objects must have the prototype chain
|
|
appropriate for the script for which the objects are created (not
|
|
those that would be appropriate for scripts whose <a href="webappapis.html#script-s-global-object">script's
|
|
global object</a> is the <code><a href="#window">Window</a></code> object in
|
|
question).</p>
|
|
|
|
<div class="example">
|
|
|
|
<p>For instance, if two frames containing <code><a href="infrastructure.html#document">Document</a></code>s
|
|
from different <a href="origin-0.html#origin" title="origin">origins</a> access the same
|
|
<code><a href="#window">Window</a></code> object's <code title="dom-window-postMessage">postMessage()</code> method, they
|
|
will get distinct objects that are not equal.</p>
|
|
|
|
</div>
|
|
|
|
</div><h4 id="apis-for-creating-and-navigating-browsing-contexts-by-name"><span class="secno">5.2.2 </span>APIs for creating and navigating browsing contexts by name</h4><dl class="domintro"><dt><var title="">window</var> = <var title="">window</var> . <code title="dom-open"><a href="#dom-open">open</a></code>( [ <var title="">url</var> [, <var title="">target</var> [, <var title="">features</var> [, <var title="">replace</var> ] ] ] ] )</dt>
|
|
|
|
<dd>
|
|
|
|
<p>Opens a window to show <var title="">url</var> (defaults to
|
|
<code><a href="fetching-resources.html#about:blank">about:blank</a></code>), and returns it. The <var title="">target</var> argument gives the name of the new
|
|
window. If a window exists with that name already, it is
|
|
reused. The <var title="">replace</var> attribute, if true, means
|
|
that whatever page is currently open in that window will be
|
|
removed from the window's session history. The <var title="">features</var> argument is ignored.</p>
|
|
|
|
</dd>
|
|
|
|
<dt><var title="">window</var> . <code title="dom-name"><a href="#dom-name">name</a></code> [ = <var title="">value</var> ]</dt>
|
|
|
|
<dd>
|
|
|
|
<p>Returns the name of the window.</p>
|
|
|
|
<p>Can be set, to change the name.</p>
|
|
|
|
</dd>
|
|
|
|
<dt><var title="">window</var> . <code title="dom-window-close"><a href="#dom-window-close">close</a></code>()</dt>
|
|
|
|
<dd>
|
|
|
|
<p>Closes the window.</p>
|
|
|
|
</dd>
|
|
|
|
<dt><var title="">window</var> . <code title="dom-window-stop"><a href="#dom-window-stop">stop</a></code>()</dt>
|
|
|
|
<dd>
|
|
|
|
<p>Cancels the document load.</p>
|
|
|
|
</dd>
|
|
|
|
</dl><div class="impl">
|
|
|
|
<p>The <dfn id="dom-open" title="dom-open"><code>open()</code></dfn> method on
|
|
<code><a href="#window">Window</a></code> objects provides a mechanism for <a href="history.html#navigate" title="navigate">navigating</a> an existing <a href="#browsing-context">browsing
|
|
context</a> or opening and navigating an <a href="#auxiliary-browsing-context">auxiliary browsing
|
|
context</a>.</p>
|
|
|
|
<p>The method has four arguments, though they are all optional.</p>
|
|
|
|
<p>The first argument, <var title="">url</var>, must be a
|
|
<a href="urls.html#valid-non-empty-url">valid non-empty URL</a> for a page to load in the browsing
|
|
context. If no arguments are provided, or if the first argument is
|
|
the empty string, then the <var title="">url</var> argument defaults
|
|
to "<code><a href="fetching-resources.html#about:blank">about:blank</a></code>". The argument must be <a href="urls.html#resolve-a-url" title="resolve a url">resolved</a> to an <a href="urls.html#absolute-url">absolute
|
|
URL</a> (or an error), relative to the <a href="#entry-script">entry
|
|
script</a>'s <a href="webappapis.html#script-s-base-url" title="script's base URL">base URL</a>,
|
|
when the method is invoked.</p>
|
|
|
|
<p>The second argument, <var title="">target</var>, specifies the
|
|
<a href="#browsing-context-name" title="browsing context name">name</a> of the browsing
|
|
context that is to be navigated. It must be a <a href="#valid-browsing-context-name-or-keyword">valid browsing
|
|
context name or keyword</a>. If fewer than two arguments are
|
|
provided, then the <var title="">target</var> argument defaults to the
|
|
value "<code>_blank</code>".</p>
|
|
|
|
<p>The third argument, <var title="">features</var>, has no defined
|
|
effect and is mentioned for historical reasons only. User agents may
|
|
interpret this argument as instructions to set the size and position
|
|
of the browsing context, but are encouraged to instead ignore the
|
|
argument entirely.</p>
|
|
|
|
<p>The fourth argument, <var title="">replace</var>, specifies
|
|
whether or not the new page will <a href="history.html#replacement-enabled" title="replacement
|
|
enabled">replace</a> the page currently loaded in the browsing
|
|
context, when <var title="">target</var> identifies an existing
|
|
browsing context (as opposed to leaving the current page in the
|
|
browsing context's <a href="history.html#session-history">session history</a>). When three or
|
|
fewer arguments are provided, <var title="">replace</var> defaults
|
|
to false.</p>
|
|
|
|
<p>When the method is invoked, the user agent must first select a
|
|
<a href="#browsing-context">browsing context</a> to navigate by applying <a href="#the-rules-for-choosing-a-browsing-context-given-a-browsing-context-name">the
|
|
rules for choosing a browsing context given a browsing context
|
|
name</a> using the <var title="">target</var> argument as the
|
|
name and the <a href="#browsing-context">browsing context</a> of the script as the
|
|
context in which the algorithm is executed, unless the user has
|
|
indicated a preference, in which case the browsing context to
|
|
navigate may instead be the one indicated by the user.</p>
|
|
|
|
<p class="example">For example, suppose there is a user agent that
|
|
supports control-clicking a link to open it in a new tab. If a user
|
|
clicks in that user agent on an element whose <code title="handler-onclick"><a href="webappapis.html#handler-onclick">onclick</a></code> handler uses the <code title="dom-open"><a href="#dom-open">window.open()</a></code> API to open a page in an
|
|
iframe, but, while doing so, holds the control key down, the user
|
|
agent could override the selection of the target browsing context to
|
|
instead target a new tab.</p>
|
|
|
|
<p>Then, the user agent must <a href="history.html#navigate">navigate</a> the selected <a href="#browsing-context">browsing context</a> to the
|
|
<a href="urls.html#absolute-url">absolute URL</a> (or error) obtained from <a href="urls.html#resolve-a-url" title="resolve a url">resolving</a> <var title="">url</var>
|
|
earlier. If the <var title="">replace</var> is true or if the
|
|
<a href="#browsing-context">browsing context</a> was just created as part of <a href="#the-rules-for-choosing-a-browsing-context-given-a-browsing-context-name">the
|
|
rules for choosing a browsing context given a browsing context
|
|
name</a>, then <a href="history.html#replacement-enabled" title="replacement enabled">replacement must
|
|
be enabled</a>. The navigation must be done with the <a href="webappapis.html#script-s-browsing-context" title="script's browsing context">browsing context</a> of the
|
|
<a href="#entry-script">entry script</a> as the <a href="history.html#source-browsing-context">source browsing
|
|
context</a>.</p>
|
|
|
|
<p>The method must return the <code><a href="#windowproxy">WindowProxy</a></code> object of the
|
|
<a href="#browsing-context">browsing context</a> that was navigated, or null if no
|
|
browsing context was navigated.</p>
|
|
|
|
<hr><p>The <dfn id="dom-name" title="dom-name"><code>name</code></dfn> attribute of
|
|
the <code><a href="#window">Window</a></code> object must, on getting, return the current
|
|
name of the <a href="#browsing-context">browsing context</a>, and, on setting, set the
|
|
name of the <a href="#browsing-context">browsing context</a> to the new value.</p>
|
|
|
|
<p class="note">The name <a href="history.html#resetBCName">gets reset</a> when
|
|
the browsing context is navigated to another domain.</p>
|
|
|
|
<hr><p>The <dfn id="dom-window-close" title="dom-window-close"><code>close()</code></dfn>
|
|
method on <code><a href="#window">Window</a></code> objects should, if the corresponding
|
|
<a href="#browsing-context">browsing context</a> <var title="">A</var> is an
|
|
<a href="#auxiliary-browsing-context">auxiliary browsing context</a> that was created by a script
|
|
(as opposed to by an action of the user), and if the <a href="webappapis.html#script-s-browsing-context" title="script's browsing context">browsing context</a> of the
|
|
<a href="webappapis.html#concept-script" title="concept-script">script</a> that invokes the method
|
|
is <a href="#allowed-to-navigate">allowed to navigate</a> the <a href="#browsing-context">browsing
|
|
context</a> <var title="">A</var>, close the <a href="#browsing-context">browsing
|
|
context</a> <var title="">A</var> (and may <a href="#a-browsing-context-is-discarded" title="a
|
|
browsing context is discarded">discard</a> it too).</p>
|
|
|
|
<p>The <dfn id="dom-window-stop" title="dom-window-stop"><code>stop()</code></dfn> method
|
|
on <code><a href="#window">Window</a></code> objects should, if there is an existing
|
|
attempt to <a href="history.html#navigate">navigate</a> the <a href="#browsing-context">browsing context</a>
|
|
and that attempt is not currently running the <a href="history.html#unload-a-document">unload a
|
|
document</a> algorithm, cancel that <a href="history.html#navigate" title="navigate">navigation</a> and any associated instances of
|
|
the <a href="fetching-resources.html#fetch" title="fetch">fetch algorithm</a>. Otherwise, it must
|
|
do nothing.</p>
|
|
|
|
</div><h4 id="accessing-other-browsing-contexts"><span class="secno">5.2.3 </span>Accessing other browsing contexts</h4><dl class="domintro"><dt><var title="">window</var> . <code title="dom-length"><a href="#dom-length">length</a></code></dt>
|
|
|
|
<dd>
|
|
|
|
<p>Returns the number of <a href="#child-browsing-context" title="child browsing
|
|
context">child browsing contexts</a>.</p>
|
|
|
|
</dd>
|
|
|
|
<dt><var title="">window</var>[<var title="">index</var>]</dt>
|
|
|
|
<dd>
|
|
|
|
<p>Returns the indicated <a href="#child-browsing-context">child browsing context</a>.</p>
|
|
|
|
</dd>
|
|
|
|
</dl><div class="impl">
|
|
|
|
<p>The <dfn id="dom-length" title="dom-length"><code>length</code></dfn> IDL
|
|
attribute on the <code><a href="#window">Window</a></code> interface must return the
|
|
number of <a href="#child-browsing-context" title="child browsing context">child browsing
|
|
contexts</a> that are <a href="#browsing-context-nested-through" title="browsing context nested
|
|
through">nested through</a> elements that are <a href="infrastructure.html#in-a-document" title="in a
|
|
document">in the <code>Document</code></a> that is the
|
|
<a href="#active-document">active document</a> of that <code><a href="#window">Window</a></code> object, if
|
|
that <code><a href="#window">Window</a></code>'s <a href="#browsing-context">browsing context</a> shares the
|
|
same <a href="webappapis.html#event-loop">event loop</a> as the <a href="webappapis.html#script-s-browsing-context">script's browsing
|
|
context</a> of the <a href="#entry-script">entry script</a> accessing the IDL
|
|
attribute; otherwise, it must return zero.</p>
|
|
|
|
|
|
|
|
<p>The <a href="infrastructure.html#supported-property-indices">supported property indices</a> on the
|
|
<code><a href="#window">Window</a></code> object at any instant are the numbers in the
|
|
range 0 .. <span title=""><var title="">n</var>-1</span>, where <var title="">n</var> is the number returned by the <code title="dom-length"><a href="#dom-length">length</a></code> IDL attribute. If <var title="">n</var> is zero then there are no <a href="infrastructure.html#supported-property-indices">supported property
|
|
indices</a>.</p>
|
|
|
|
<p>To <dfn id="dom-window-item" title="dom-window-item">determine the value of an indexed
|
|
property</dfn> <var title="">index</var> of a <code><a href="#window">Window</a></code>
|
|
object, the user agent must return the <code><a href="#windowproxy">WindowProxy</a></code>
|
|
object of the <var title="">index</var>th <a href="#child-browsing-context">child browsing
|
|
context</a> of the <code><a href="infrastructure.html#document">Document</a></code> that is nested through
|
|
an element that is <a href="infrastructure.html#in-a-document" title="in a document">in the
|
|
<code>Document</code></a>, sorted in the <a href="infrastructure.html#tree-order">tree order</a>
|
|
of the elements nesting those <a href="#browsing-context" title="browsing
|
|
context">browsing contexts</a>.</p>
|
|
|
|
<p>These properties are the <dfn id="dynamic-nested-browsing-context-properties">dynamic nested browsing context
|
|
properties</dfn>.</p>
|
|
|
|
</div><h4 id="named-access-on-the-window-object"><span class="secno">5.2.4 </span>Named access on the <code><a href="#window">Window</a></code> object</h4><dl class="domintro"><dt><var title="">window</var>[<var title="">name</var>]</dt>
|
|
|
|
<dd>
|
|
|
|
<p>Returns the indicated element or collection of elements.</p>
|
|
|
|
</dd>
|
|
|
|
</dl><div class="impl">
|
|
|
|
<p>The <code><a href="#window">Window</a></code> interface <span title="support named
|
|
properties">supports named properties</span>. The <a href="infrastructure.html#supported-property-names">supported
|
|
property names</a> at any moment consist of:</p>
|
|
|
|
<ul><li>the value of the <code title="">name</code> content attribute
|
|
for all <code><a href="text-level-semantics.html#the-a-element">a</a></code>, <code><a href="obsolete.html#the-applet-element">applet</a></code>, <code><a href="the-map-element.html#the-area-element">area</a></code>,
|
|
<code><a href="the-iframe-element.html#the-embed-element">embed</a></code>, <code><a href="forms.html#the-form-element">form</a></code>, <code><a href="obsolete.html#frame">frame</a></code>,
|
|
<code><a href="obsolete.html#frameset">frameset</a></code>, <code><a href="the-iframe-element.html#the-iframe-element">iframe</a></code>, <code><a href="embedded-content-1.html#the-img-element">img</a></code>, and
|
|
<code><a href="the-iframe-element.html#the-object-element">object</a></code> elements in the <a href="#active-document">active document</a>
|
|
that have a <code title="">name</code> content attribute, and</li>
|
|
|
|
<li>the value of the <code title="attr-id"><a href="elements.html#the-id-attribute">id</a></code> content
|
|
attribute of any <a href="infrastructure.html#html-elements" title="HTML elements">HTML element</a> in
|
|
the <a href="#active-document">active document</a> with an <code title="attr-id"><a href="elements.html#the-id-attribute">id</a></code> content attribute.</li>
|
|
|
|
</ul><p class="critical">It is possible that this will change. Browser
|
|
vendors are considering limiting this behaviour to <a href="dom.html#quirks-mode">quirks
|
|
mode</a>. <a href="http://www.w3.org/Bugs/Public/show_bug.cgi?id=11960">Read
|
|
more...</a></p>
|
|
|
|
<p>When <dfn id="dom-window-nameditem" title="dom-window-namedItem">the <code>Window</code>
|
|
object is indexed for property retrieval</dfn> using a name <var title="">name</var>, then the user agent must return the value
|
|
obtained using the following steps:</p>
|
|
|
|
<ol><li>
|
|
|
|
<p>Let <var title="">elements</var> be the list of <a href="#dom-window-nameditem-filter" title="dom-window-namedItem-filter">named elements</a> with the
|
|
name <var title="">name</var> in the <a href="#active-document">active document</a>.
|
|
|
|
</p><p class="note">There will be at least one such element, by
|
|
definition.</p>
|
|
|
|
</li>
|
|
|
|
<li>
|
|
|
|
<p>If <var title="">elements</var> contains an <code><a href="the-iframe-element.html#the-iframe-element">iframe</a></code>
|
|
element, then return the <code><a href="#windowproxy">WindowProxy</a></code> object of the
|
|
<a href="#nested-browsing-context">nested browsing context</a> represented by the first such
|
|
<code><a href="the-iframe-element.html#the-iframe-element">iframe</a></code> element in <a href="infrastructure.html#tree-order">tree order</a>, and abort
|
|
these steps.</p>
|
|
|
|
</li>
|
|
|
|
<li>
|
|
|
|
<p>Otherwise, if <var title="">elements</var> has only one
|
|
element, return that element and abort these steps.</p>
|
|
|
|
</li>
|
|
|
|
<li>
|
|
|
|
<p>Otherwise return an <code><a href="common-dom-interfaces.html#htmlcollection">HTMLCollection</a></code> rooted at the
|
|
<code><a href="infrastructure.html#document">Document</a></code> node, whose filter matches only <a href="#dom-window-nameditem-filter" title="dom-window-namedItem-filter">named elements</a> with
|
|
the name <var title="">name</var>.</p>
|
|
</li>
|
|
|
|
</ol><p><dfn id="dom-window-nameditem-filter" title="dom-window-nameditem-filter">Named elements</dfn>
|
|
with the name <var title="">name</var>, for the purposes of the
|
|
above algorithm, are those that are either:</p>
|
|
|
|
<ul><li><code><a href="text-level-semantics.html#the-a-element">a</a></code>, <code><a href="obsolete.html#the-applet-element">applet</a></code>, <code><a href="the-map-element.html#the-area-element">area</a></code>,
|
|
<code><a href="the-iframe-element.html#the-embed-element">embed</a></code>, <code><a href="forms.html#the-form-element">form</a></code>, <code><a href="obsolete.html#frame">frame</a></code>,
|
|
<code><a href="obsolete.html#frameset">frameset</a></code>, <code><a href="the-iframe-element.html#the-iframe-element">iframe</a></code>, <code><a href="embedded-content-1.html#the-img-element">img</a></code>, or
|
|
<code><a href="the-iframe-element.html#the-object-element">object</a></code> elements that have a <code title="attr-name">name</code> content attribute whose value is <var title="">name</var>, or</li>
|
|
|
|
<li><a href="infrastructure.html#html-elements">HTML elements</a> that have an <code title="attr-id"><a href="elements.html#the-id-attribute">id</a></code> content attribute whose value is <var title="">name</var>.</li>
|
|
|
|
</ul></div><div class="impl">
|
|
|
|
<h4 id="garbage-collection-and-browsing-contexts"><span class="secno">5.2.5 </span>Garbage collection and browsing contexts</h4>
|
|
|
|
<p>A <a href="#browsing-context">browsing context</a> has a strong reference to each of
|
|
its <code><a href="infrastructure.html#document">Document</a></code>s and its <code><a href="#windowproxy">WindowProxy</a></code> object,
|
|
and the user agent itself has a strong reference to its <a href="#top-level-browsing-context" title="top-level browsing context">top-level browsing
|
|
contexts</a>.</p>
|
|
|
|
<p>A <code><a href="infrastructure.html#document">Document</a></code> has a strong reference to its
|
|
<code><a href="#window">Window</a></code> object.</p>
|
|
|
|
<p class="note">A <code><a href="#window">Window</a></code> object <a href="common-dom-interfaces.html#implied-strong-reference" title="implied
|
|
strong reference">has a strong reference</a> to its
|
|
<code><a href="infrastructure.html#document">Document</a></code> object through its <code title="dom-document"><a href="#dom-document">document</a></code> attribute. Thus, references
|
|
from other scripts to either of those objects will keep both
|
|
alive. Similarly, both <code><a href="infrastructure.html#document">Document</a></code> and <code><a href="#window">Window</a></code>
|
|
objects have <a href="common-dom-interfaces.html#implied-strong-reference" title="implied strong reference">implied strong
|
|
references</a> to the <code><a href="#windowproxy">WindowProxy</a></code> object.</p>
|
|
|
|
<p>Each <a href="webappapis.html#concept-script" title="concept-script">script</a> has a strong
|
|
reference to its <a href="webappapis.html#script-s-browsing-context" title="script's browsing context">browsing
|
|
context</a> and its <a href="webappapis.html#script-s-document" title="script's
|
|
document">document</a>.</p>
|
|
|
|
<p>When a <a href="#browsing-context">browsing context</a> is to <dfn id="discard-a-document">discard a
|
|
<code>Document</code></dfn>, the user agent must run the following
|
|
steps:</p>
|
|
|
|
<ol><li><p>Set the <code><a href="infrastructure.html#document">Document</a></code>'s <var title="concept-document-salvageable">salvageable</var> state to
|
|
false.</p></li>
|
|
|
|
<li><p>Run any <a href="history.html#unloading-document-cleanup-steps">unloading document cleanup steps</a> for
|
|
the <code><a href="infrastructure.html#document">Document</a></code> that are defined by this specification
|
|
and <a href="infrastructure.html#other-applicable-specifications">other applicable specifications</a>.</p></li>
|
|
|
|
<li><p>Remove any <a href="webappapis.html#concept-task" title="concept-task">tasks</a>
|
|
associated with the <code><a href="infrastructure.html#document">Document</a></code> in any <a href="webappapis.html#task-source">task
|
|
source</a>, without running those tasks.</p></li>
|
|
|
|
<li><p><a href="#a-browsing-context-is-discarded" title="a browsing context is discarded">Discard</a>
|
|
all the <a href="#child-browsing-context" title="child browsing context">child browsing
|
|
contexts</a> of the <code><a href="infrastructure.html#document">Document</a></code>.</p></li>
|
|
|
|
<li><p>Lose the strong reference from the <code><a href="infrastructure.html#document">Document</a></code>'s
|
|
<a href="#browsing-context">browsing context</a> to the
|
|
<code><a href="infrastructure.html#document">Document</a></code>.</p></li>
|
|
|
|
</ol><p class="note">Whenever a <code><a href="infrastructure.html#document">Document</a></code> object is <a href="#discard-a-document" title="discard a Document">discarded</a>, it is also removed from
|
|
the list of <span>the worker's <code><a href="infrastructure.html#document">Document</a></code>s</span> of each
|
|
worker whose list contains that <code><a href="infrastructure.html#document">Document</a></code>.</p>
|
|
|
|
<p>When <dfn id="a-browsing-context-is-discarded">a <em><span>browsing context</span></em> is
|
|
discarded</dfn>, the strong reference from the user agent itself to
|
|
the <a href="#browsing-context">browsing context</a> must be severed, and all the
|
|
<code><a href="infrastructure.html#document">Document</a></code> objects for all the entries in the
|
|
<a href="#browsing-context">browsing context</a>'s session history must be <a href="#discard-a-document" title="discard a document">discarded</a> as well.</p>
|
|
|
|
<p>User agents may <a href="#a-browsing-context-is-discarded" title="a browsing context is
|
|
discarded">discard</a> <a href="#top-level-browsing-context" title="top-level browsing
|
|
context">top-level browsing contexts</a> at any time (typically,
|
|
in response to user requests, e.g. when a user closes a window
|
|
containing one or more <a href="#top-level-browsing-context" title="top-level browsing
|
|
context">top-level browsing contexts</a>). Other <a href="#browsing-context" title="browsing context">browsing contexts</a> must be discarded
|
|
once their <code><a href="#windowproxy">WindowProxy</a></code> object is eligible for garbage
|
|
collection.</p>
|
|
|
|
</div><h4 id="browser-interface-elements"><span class="secno">5.2.6 </span>Browser interface elements</h4><p>To allow Web pages to integrate with Web browsers, certain Web
|
|
browser interface elements are exposed in a limited way to scripts
|
|
in Web pages.</p><p>Each interface element is represented by a <code><a href="#barprop">BarProp</a></code>
|
|
object:</p><pre class="idl">interface <dfn id="barprop">BarProp</dfn> {
|
|
attribute boolean <a href="#dom-barprop-visible" title="dom-BarProp-visible">visible</a>;
|
|
};</pre><dl class="domintro"><dt><var title="">window</var> . <code title="dom-window-locationbar"><a href="#dom-window-locationbar">locationbar</a></code> . <code title="dom-BarProp-visible"><a href="#dom-barprop-visible">visible</a></code></dt>
|
|
<dd>
|
|
<p>Returns true if the location bar is visible; otherwise, returns false.</p>
|
|
</dd>
|
|
|
|
<dt><var title="">window</var> . <code title="dom-window-menubar"><a href="#dom-window-menubar">menubar</a></code> . <code title="dom-BarProp-visible"><a href="#dom-barprop-visible">visible</a></code></dt>
|
|
<dd>
|
|
<p>Returns true if the menu bar is visible; otherwise, returns false.</p>
|
|
</dd>
|
|
|
|
<dt><var title="">window</var> . <code title="dom-window-personalbar"><a href="#dom-window-personalbar">personalbar</a></code> . <code title="dom-BarProp-visible"><a href="#dom-barprop-visible">visible</a></code></dt>
|
|
|
|
<dd>
|
|
<p>Returns true if the personal bar is visible; otherwise, returns false.</p>
|
|
</dd>
|
|
|
|
<dt><var title="">window</var> . <code title="dom-window-scrollbars"><a href="#dom-window-scrollbars">scrollbars</a></code> . <code title="dom-BarProp-visible"><a href="#dom-barprop-visible">visible</a></code></dt>
|
|
<dd>
|
|
<p>Returns true if the scroll bars are visible; otherwise, returns false.</p>
|
|
</dd>
|
|
|
|
<dt><var title="">window</var> . <code title="dom-window-statusbar"><a href="#dom-window-statusbar">statusbar</a></code> . <code title="dom-BarProp-visible"><a href="#dom-barprop-visible">visible</a></code></dt>
|
|
<dd>
|
|
<p>Returns true if the status bar is visible; otherwise, returns false.</p>
|
|
</dd>
|
|
|
|
<dt><var title="">window</var> . <code title="dom-window-toolbar"><a href="#dom-window-toolbar">toolbar</a></code> . <code title="dom-BarProp-visible"><a href="#dom-barprop-visible">visible</a></code></dt>
|
|
<dd>
|
|
<p>Returns true if the toolbar is visible; otherwise, returns false.</p>
|
|
</dd>
|
|
|
|
</dl><div class="impl">
|
|
|
|
<p>The <dfn id="dom-barprop-visible" title="dom-BarProp-visible">visible</dfn> attribute, on
|
|
getting, must return either true or a value determined by the user
|
|
agent to most accurately represent the visibility state of the user
|
|
interface element that the object represents, as described below. On
|
|
setting, the new value must be discarded.</p>
|
|
|
|
<p>The following <code><a href="#barprop">BarProp</a></code> objects exist for each
|
|
<code><a href="infrastructure.html#document">Document</a></code> object in a <a href="#browsing-context">browsing
|
|
context</a>. Some of the user interface elements represented by
|
|
these objects might have no equivalent in some user agents; for
|
|
those user agents, except when otherwise specified, the object must
|
|
act as if it was present and visible (i.e. its <code title="dom-BarProp-visible"><a href="#dom-barprop-visible">visible</a></code> attribute must return
|
|
true).</p>
|
|
|
|
<dl><dt><dfn id="the-location-bar-barprop-object">The location bar <code>BarProp</code> object</dfn></dt>
|
|
|
|
<dd>Represents the user interface element that contains a control
|
|
that displays the <a href="urls.html#url">URL</a> of the <a href="#active-document">active
|
|
document</a>, or some similar interface concept.</dd>
|
|
|
|
<dt><dfn id="the-menu-bar-barprop-object">The menu bar <code>BarProp</code> object</dfn></dt>
|
|
|
|
<dd>Represents the user interface element that contains a list of
|
|
commands in menu form, or some similar interface concept.</dd>
|
|
|
|
<dt><dfn id="the-personal-bar-barprop-object">The personal bar <code>BarProp</code> object</dfn></dt>
|
|
|
|
<dd>Represents the user interface element that contains links to
|
|
the user's favorite pages, or some similar interface concept.</dd>
|
|
|
|
<dt><dfn id="the-scrollbar-barprop-object">The scrollbar <code>BarProp</code> object</dfn></dt>
|
|
|
|
<dd>Represents the user interface element that contains a scrolling
|
|
mechanism, or some similar interface concept.</dd>
|
|
|
|
<dt><dfn id="the-status-bar-barprop-object">The status bar <code>BarProp</code> object</dfn></dt>
|
|
|
|
<dd>Represents a user interface element found immediately below or
|
|
after the document, as appropriate for the user's media. If the
|
|
user agent has no such user interface element, then the object may
|
|
act as if the corresponding user interface element was absent
|
|
(i.e. its <code title="dom-BarProp-visible"><a href="#dom-barprop-visible">visible</a></code>
|
|
attribute may return false).</dd>
|
|
|
|
<dt><dfn id="the-toolbar-barprop-object">The toolbar <code>BarProp</code> object</dfn></dt>
|
|
|
|
<dd>Represents the user interface element found immediately above
|
|
or before the document, as appropriate for the user's media. If the
|
|
user agent has no such user interface element, then the object may
|
|
act as if the corresponding user interface element was absent
|
|
(i.e. its <code title="dom-BarProp-visible"><a href="#dom-barprop-visible">visible</a></code>
|
|
attribute may return false).</dd>
|
|
|
|
</dl><p>The <dfn id="dom-window-locationbar" title="dom-window-locationbar"><code>locationbar</code></dfn>
|
|
attribute must return <a href="#the-location-bar-barprop-object">the location bar <code>BarProp</code>
|
|
object</a>.</p>
|
|
|
|
<p>The <dfn id="dom-window-menubar" title="dom-window-menubar"><code>menubar</code></dfn>
|
|
attribute must return <a href="#the-menu-bar-barprop-object">the menu bar <code>BarProp</code>
|
|
object</a>.</p>
|
|
|
|
<p>The <dfn id="dom-window-personalbar" title="dom-window-personalbar"><code>personalbar</code></dfn>
|
|
attribute must return <a href="#the-personal-bar-barprop-object">the personal bar <code>BarProp</code>
|
|
object</a>.</p>
|
|
|
|
<p>The <dfn id="dom-window-scrollbars" title="dom-window-scrollbars"><code>scrollbars</code></dfn>
|
|
attribute must return <a href="#the-scrollbar-barprop-object">the scrollbar <code>BarProp</code>
|
|
object</a>.</p>
|
|
|
|
<p>The <dfn id="dom-window-statusbar" title="dom-window-statusbar"><code>statusbar</code></dfn> attribute
|
|
must return <a href="#the-status-bar-barprop-object">the status bar <code>BarProp</code>
|
|
object</a>.</p>
|
|
|
|
<p>The <dfn id="dom-window-toolbar" title="dom-window-toolbar"><code>toolbar</code></dfn>
|
|
attribute must return <a href="#the-toolbar-barprop-object">the toolbar <code>BarProp</code>
|
|
object</a>.</p>
|
|
|
|
|
|
</div><div class="impl">
|
|
|
|
<h4 id="the-windowproxy-object"><span class="secno">5.2.7 </span>The <code><a href="#windowproxy">WindowProxy</a></code> object</h4>
|
|
|
|
|
|
<p>As mentioned earlier, each <a href="#browsing-context">browsing context</a> has a
|
|
<dfn id="windowproxy"><code>WindowProxy</code></dfn> object. This object is unusual
|
|
in that all operations that would be performed on it must be
|
|
performed on the <code><a href="#window">Window</a></code> object of the <a href="#browsing-context">browsing
|
|
context</a>'s <a href="#active-document">active document</a> instead. It is thus
|
|
indistinguishable from that <code><a href="#window">Window</a></code> object in every way
|
|
until the <a href="#browsing-context">browsing context</a> is navigated.</p>
|
|
|
|
<p>There is no <code><a href="#windowproxy">WindowProxy</a></code> interface object.</p>
|
|
|
|
<p class="note">The <code><a href="#windowproxy">WindowProxy</a></code> object allows scripts
|
|
to act as if each <a href="#browsing-context">browsing context</a> had a single
|
|
<code><a href="#window">Window</a></code> object, while still keeping separate
|
|
<code><a href="#window">Window</a></code> objects for each <code><a href="infrastructure.html#document">Document</a></code>.</p>
|
|
|
|
<div class="example">
|
|
|
|
<p>In the following example, the variable <var title="">x</var> is
|
|
set to the <code><a href="#windowproxy">WindowProxy</a></code> object returned by the <code title="dom-window"><a href="#dom-window">window</a></code> accessor on the global object. All
|
|
of the expressions following the assignment return true, because in
|
|
every respect, the <code><a href="#windowproxy">WindowProxy</a></code> object acts like the
|
|
underlying <code><a href="#window">Window</a></code> object.</p>
|
|
|
|
<pre>var x = window;
|
|
x instanceof Window; // true
|
|
x === this; // true</pre>
|
|
|
|
</div>
|
|
|
|
</div></body></html>
|