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index.html
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<!DOCTYPE html><html lang="en" dir="ltr"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><meta name="generator" content="ReSpec 25.1.0"><meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"><style>/* --- ISSUES/NOTES --- */
.issue-label {
text-transform: initial;
}
.warning > p:first-child { margin-top: 0 }
.warning {
padding: .5em;
border-left-width: .5em;
border-left-style: solid;
}
span.warning { padding: .1em .5em .15em; }
.issue.closed span.issue-number {
text-decoration: line-through;
}
.warning {
border-color: #f11;
border-width: .2em;
border-style: solid;
background: #fbe9e9;
}
.warning-title:before{
content: "⚠"; /*U+26A0 WARNING SIGN*/
font-size: 1.3em;
float: left;
padding-right: .3em;
margin-top: -0.3em;
}
li.task-list-item {
list-style: none;
}
input.task-list-item-checkbox {
margin: 0 0.35em 0.25em -1.6em;
vertical-align: middle;
}
.issue a.respec-gh-label {
padding: 5px;
margin: 0 2px 0 2px;
font-size: 10px;
text-transform: none;
text-decoration: none;
font-weight: bold;
border-radius: 4px;
position: relative;
bottom: 2px;
border: none;
display: inline-block;
}
.issue a.respec-label-dark {
color: #fff;
background-color: #000;
}
.issue a.respec-label-light {
color: #000;
background-color: #fff;
}
</style><style>/* --- WEB IDL --- */
pre.idl {
padding: 1em;
position: relative;
}
@media print {
pre.idl {
white-space: pre-wrap;
}
}
.idlHeader {
display: block;
width: 150px;
background: #90b8de;
color: #fff;
font-family: sans-serif;
font-weight: bold;
margin: -1em 0 1em -1em;
height: 28px;
line-height: 28px;
}
.idlHeader a.self-link {
color: #fff;
margin-left: .3cm;
text-decoration: none;
border-bottom: none;
}
.idlID {
font-weight: bold;
color: #005a9c;
}
.idlType {
color: #005a9c;
}
.idlName {
color: #ff4500;
}
.idlName a {
color: #ff4500;
border-bottom: 1px dotted #ff4500;
text-decoration: none;
}
a.idlEnumItem {
color: #000;
border-bottom: 1px dotted #ccc;
text-decoration: none;
}
.idlSuperclass {
font-style: italic;
color: #005a9c;
}
/*.idlParam*/
.idlParamName,
.idlDefaultValue {
font-style: italic;
}
.extAttr {
color: #666;
}
/*.idlSectionComment*/
.idlSectionComment {
color: gray;
}
.idlIncludes a {
font-weight: bold;
}
.respec-button-copy-paste:focus {
text-decoration: none;
border-color: #51a7e8;
outline: none;
box-shadow: 0 0 5px rgba(81, 167, 232, 0.5);
}
.respec-button-copy-paste:focus:hover,
.respec-button-copy-paste.selected:focus {
border-color: #51a7e8;
}
.respec-button-copy-paste:hover,
.respec-button-copy-paste:active,
.respec-button-copy-paste.zeroclipboard-is-hover,
.respec-button-copy-paste.zeroclipboard-is-active {
text-decoration: none;
background-color: #ddd;
background-image: linear-gradient(#eee, #ddd);
border-color: #ccc;
}
.respec-button-copy-paste:active,
.respec-button-copy-paste.selected,
.respec-button-copy-paste.zeroclipboard-is-active {
background-color: #dcdcdc;
background-image: none;
border-color: #b5b5b5;
box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.15)
}
.respec-button-copy-paste.selected:hover {
background-color: #cfcfcf;
}
.respec-button-copy-paste:disabled,
.respec-button-copy-paste:disabled:hover,
.respec-button-copy-paste.disabled,
.respec-button-copy-paste.disabled:hover {
color: rgba(102, 102, 102, 0.5);
cursor: default;
background-color: rgba(229, 229, 229, 0.5);
background-image: none;
border-color: rgba(197, 197, 197, 0.5);
box-shadow: none;
}
@media print {
.respec-button-copy-paste {
visibility: hidden;
}
}
</style><style>/* dfn popup panel that list all local references to a dfn */
dfn {
cursor: pointer;
}
.dfn-panel {
position: absolute;
left: var(--left); /* set via JS */
top: var(--top); /* set via JS */
z-index: 35;
height: auto;
width: max-content;
max-width: 300px;
max-height: 500px;
overflow: auto;
padding: 0.5em 0.75em;
font: small Helvetica Neue, sans-serif, Droid Sans Fallback;
background: #dddddd;
color: black;
border: outset 0.2em;
}
.dfn-panel * {
margin: 0;
}
.dfn-panel > b {
display: block;
}
.dfn-panel ul a[href] {
color: black;
}
.dfn-panel a:not(:hover) {
text-decoration: none !important;
border-bottom: none !important;
}
.dfn-panel a[href]:hover {
border-bottom-width: 1px;
}
.dfn-panel > b + b {
margin-top: 0.25em;
}
.dfn-panel ul {
padding: 0;
}
.dfn-panel li {
list-style: inside;
}
.dfn-panel.docked {
display: inline-block;
position: fixed;
left: 0.5em;
top: unset;
bottom: 2em;
margin: 0 auto;
/* 0.75em from padding (x2), 0.5em from left position, 0.2em border (x2) */
max-width: calc(100vw - 0.75em * 2 - 0.5em - 0.2em * 2);
max-height: 30vh;
}
</style>
<title>Media Source Extensions™</title>
<style id="respec-mainstyle">/*****************************************************************
* ReSpec specific CSS
*****************************************************************/
@keyframes pop {
0% {
transform: scale(1, 1);
}
25% {
transform: scale(1.25, 1.25);
opacity: 0.75;
}
100% {
transform: scale(1, 1);
}
}
/* Override code highlighter background */
.hljs {
background: transparent !important;
}
/* --- INLINES --- */
h1 abbr,
h2 abbr,
h3 abbr,
h4 abbr,
h5 abbr,
h6 abbr,
a abbr {
border: none;
}
dfn {
font-weight: bold;
}
a.internalDFN {
color: inherit;
border-bottom: 1px solid #99c;
text-decoration: none;
}
a.externalDFN {
color: inherit;
border-bottom: 1px dotted #ccc;
text-decoration: none;
}
a.bibref {
text-decoration: none;
}
.respec-offending-element:target {
animation: pop 0.25s ease-in-out 0s 1;
}
.respec-offending-element,
a[href].respec-offending-element {
text-decoration: red wavy underline;
}
@supports not (text-decoration: red wavy underline) {
.respec-offending-element:not(pre) {
display: inline-block;
}
.respec-offending-element {
/* Red squiggly line */
background: url(data:image/gif;base64,R0lGODdhBAADAPEAANv///8AAP///wAAACwAAAAABAADAEACBZQjmIAFADs=)
bottom repeat-x;
}
}
#references :target {
background: #eaf3ff;
animation: pop 0.4s ease-in-out 0s 1;
}
cite .bibref {
font-style: normal;
}
code {
color: #c83500;
}
th code {
color: inherit;
}
a[href].orcid {
padding-left: 4px;
padding-right: 4px;
}
a[href].orcid > svg {
margin-bottom: -2px;
}
/* --- TOC --- */
.toc a,
.tof a {
text-decoration: none;
}
a .secno,
a .figno {
color: #000;
}
ul.tof,
ol.tof {
list-style: none outside none;
}
.caption {
margin-top: 0.5em;
font-style: italic;
}
/* --- TABLE --- */
table.simple {
border-spacing: 0;
border-collapse: collapse;
border-bottom: 3px solid #005a9c;
}
.simple th {
background: #005a9c;
color: #fff;
padding: 3px 5px;
text-align: left;
}
.simple th a {
color: #fff;
padding: 3px 5px;
text-align: left;
}
.simple th[scope="row"] {
background: inherit;
color: inherit;
border-top: 1px solid #ddd;
}
.simple td {
padding: 3px 10px;
border-top: 1px solid #ddd;
}
.simple tr:nth-child(even) {
background: #f0f6ff;
}
/* --- DL --- */
.section dd > p:first-child {
margin-top: 0;
}
.section dd > p:last-child {
margin-bottom: 0;
}
.section dd {
margin-bottom: 1em;
}
.section dl.attrs dd,
.section dl.eldef dd {
margin-bottom: 0;
}
#issue-summary > ul,
.respec-dfn-list {
column-count: 2;
}
#issue-summary li,
.respec-dfn-list li {
list-style: none;
}
details.respec-tests-details {
margin-left: 1em;
display: inline-block;
vertical-align: top;
}
details.respec-tests-details > * {
padding-right: 2em;
}
details.respec-tests-details[open] {
z-index: 999999;
position: absolute;
border: thin solid #cad3e2;
border-radius: 0.3em;
background-color: white;
padding-bottom: 0.5em;
}
details.respec-tests-details[open] > summary {
border-bottom: thin solid #cad3e2;
padding-left: 1em;
margin-bottom: 1em;
line-height: 2em;
}
details.respec-tests-details > ul {
width: 100%;
margin-top: -0.3em;
}
details.respec-tests-details > li {
padding-left: 1em;
}
a[href].self-link:hover {
opacity: 1;
text-decoration: none;
background-color: transparent;
}
h2,
h3,
h4,
h5,
h6 {
position: relative;
}
aside.example .marker > a.self-link {
color: inherit;
}
h2 > a.self-link,
h3 > a.self-link,
h4 > a.self-link,
h5 > a.self-link,
h6 > a.self-link {
border: none;
color: inherit;
font-size: 83%;
height: 2em;
left: -1.6em;
opacity: 0.5;
position: absolute;
text-align: center;
text-decoration: none;
top: 0;
transition: opacity 0.2s;
width: 2em;
}
h2 > a.self-link::before,
h3 > a.self-link::before,
h4 > a.self-link::before,
h5 > a.self-link::before,
h6 > a.self-link::before {
content: "§";
display: block;
}
@media (max-width: 767px) {
dd {
margin-left: 0;
}
/* Don't position self-link in headings off-screen */
h2 > a.self-link,
h3 > a.self-link,
h4 > a.self-link,
h5 > a.self-link,
h6 > a.self-link {
left: auto;
top: auto;
}
}
@media print {
.removeOnSave {
display: none;
}
}
</style>
<link rel="stylesheet" href="mse.css">
<link rel="canonical" href="https://www.w3.org/TR/media-source/"><style>/*
Atom One Light by Daniel Gamage
Original One Light Syntax theme from https://github.com/atom/one-light-syntax
base: #fafafa
mono-1: #383a42
mono-2: #686b77
mono-3: #a0a1a7
hue-1: #0184bb
hue-2: #4078f2
hue-3: #a626a4
hue-4: #50a14f
hue-5: #e45649
hue-5-2: #c91243
hue-6: #986801
hue-6-2: #c18401
*/
.hljs {
display: block;
overflow-x: auto;
padding: 0.5em;
color: #383a42;
background: #fafafa;
}
.hljs-comment,
.hljs-quote {
color: #a0a1a7;
font-style: italic;
}
.hljs-doctag,
.hljs-keyword,
.hljs-formula {
color: #a626a4;
}
.hljs-section,
.hljs-name,
.hljs-selector-tag,
.hljs-deletion,
.hljs-subst {
color: #e45649;
}
.hljs-literal {
color: #0184bb;
}
.hljs-string,
.hljs-regexp,
.hljs-addition,
.hljs-attribute,
.hljs-meta-string {
color: #50a14f;
}
.hljs-built_in,
.hljs-class .hljs-title {
color: #c18401;
}
.hljs-attr,
.hljs-variable,
.hljs-template-variable,
.hljs-type,
.hljs-selector-class,
.hljs-selector-attr,
.hljs-selector-pseudo,
.hljs-number {
color: #986801;
}
.hljs-symbol,
.hljs-bullet,
.hljs-link,
.hljs-meta,
.hljs-selector-id,
.hljs-title {
color: #4078f2;
}
.hljs-emphasis {
font-style: italic;
}
.hljs-strong {
font-weight: bold;
}
.hljs-link {
text-decoration: underline;
}
</style><style>var {
position: relative;
cursor: pointer;
}
var[data-type]::before,
var[data-type]::after {
position: absolute;
left: 50%;
top: -6px;
opacity: 0;
transition: opacity 0.4s;
pointer-events: none;
}
/* the triangle or arrow or caret or whatever */
var[data-type]::before {
content: "";
transform: translateX(-50%);
border-width: 4px 6px 0 6px;
border-style: solid;
border-color: transparent;
border-top-color: #000;
}
/* actual text */
var[data-type]::after {
content: attr(data-type);
transform: translateX(-50%) translateY(-100%);
background: #000;
text-align: center;
/* additional styling */
font-family: "Dank Mono", "Fira Code", monospace;
font-style: normal;
padding: 6px;
border-radius: 3px;
color: #daca88;
text-indent: 0;
font-weight: normal;
}
var[data-type]:hover::after,
var[data-type]:hover::before {
opacity: 1;
}
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<a class="logo" href="https://www.w3.org/"><img alt="W3C" width="72" height="48" src="https://www.w3.org/StyleSheets/TR/2016/logos/W3C"></a> <h1 id="title" class="title p-name">Media Source Extensions™</h1>
<h2>
W3C Editor's Draft
<time class="dt-published" datetime="2020-01-30">30 January 2020</time>
</h2>
<dl>
<dt>This version:</dt><dd>
<a class="u-url" href="https://w3c.github.io/media-source/">https://w3c.github.io/media-source/</a>
</dd><dt>Latest published version:</dt><dd>
<a href="https://www.w3.org/TR/media-source/">https://www.w3.org/TR/media-source/</a>
</dd>
<dt>Latest editor's draft:</dt><dd><a href="https://w3c.github.io/media-source/">https://w3c.github.io/media-source/</a></dd>
<dt>Implementation report:</dt><dd>
<a href="http://tidoust.github.io/media-source-testcoverage/">http://tidoust.github.io/media-source-testcoverage/</a>
</dd>
<dt>Editors:</dt>
<dd class="p-author h-card vcard"><span class="p-name fn">Matthew Wolenetz</span>
(<a class="p-org org h-org h-card" href="http://www.google.com/">Google Inc.</a>)
</dd><dd class="p-author h-card vcard"><span class="p-name fn">Mark Watson</span>
(<a class="p-org org h-org h-card" href="http://www.netflix.com/">Netflix Inc.</a>)
</dd>
<dt>
Former editors:
</dt><dd class="p-author h-card vcard"><span class="p-name fn">Jerry Smith</span>
(<a class="p-org org h-org h-card" href="http://www.microsoft.com/">Microsoft Corporation</a>)
(Until September 2017)</dd><dd class="p-author h-card vcard"><span class="p-name fn">Aaron Colwell</span>
(<a class="p-org org h-org h-card" href="http://www.google.com/">Google Inc.</a>)
(Until April 2015)</dd><dd class="p-author h-card vcard"><span class="p-name fn">Adrian Bateman</span>
(<a class="p-org org h-org h-card" href="http://www.microsoft.com/">Microsoft Corporation</a>)
(Until April 2015)</dd>
<dt>Repository:</dt><dd>
<a href="https://github.com/w3c/media-source/">We are on GitHub</a>
</dd><dd>
<a href="https://github.com/w3c/media-source/issues">File a bug</a>
</dd><dd>
<a href="https://github.com/w3c/media-source/commits/gh-pages/media-source-respec.html">Commit history</a>
</dd><dt>Mailing list:</dt><dd>
<a href="https://lists.w3.org/Archives/Public/public-html-media/">public-html-media@w3.org</a>
</dd><dt>Implementation:</dt><dd>
<a href="http://caniuse.com/#feat=mediasource">Can I use Media Source Extensions?</a>
</dd><dd>
<a href="http://w3c-test.org/media-source/">Test Suite</a>
</dd><dd>
<a href="https://github.com/w3c/web-platform-tests/tree/master/media-source">Test Suite repository</a>
</dd>
</dl>
<p>
Please check the
<a href="https://w3c.github.io/media-source/mse-1-errata.html"><strong>errata</strong></a> for any
errors or issues reported since publication.
</p>
<p class="copyright">
<a href="https://www.w3.org/Consortium/Legal/ipr-notice#Copyright">Copyright</a>
©
2020
<a href="https://www.w3.org/"><abbr title="World Wide Web Consortium">W3C</abbr></a><sup>®</sup> (<a href="https://www.csail.mit.edu/"><abbr title="Massachusetts Institute of Technology">MIT</abbr></a>,
<a href="https://www.ercim.eu/"><abbr title="European Research Consortium for Informatics and Mathematics">ERCIM</abbr></a>, <a href="https://www.keio.ac.jp/">Keio</a>,
<a href="https://ev.buaa.edu.cn/">Beihang</a>).
W3C <a href="https://www.w3.org/Consortium/Legal/ipr-notice#Legal_Disclaimer">liability</a>,
<a href="https://www.w3.org/Consortium/Legal/ipr-notice#W3C_Trademarks">trademark</a> and <a rel="license" href="https://www.w3.org/Consortium/Legal/2015/copyright-software-and-document">permissive document license</a> rules
apply.
</p>
<hr title="Separator for header">
</div>
<section id="sotd" class="introductory"><h2>Status of This Document</h2><p><em>This section describes the status of this document at the time of its publication. Other documents may supersede this document. A list of current <abbr title="World Wide Web Consortium">W3C</abbr> publications and the latest revision of this technical report can be found in the <a href="https://www.w3.org/TR/"><abbr title="World Wide Web Consortium">W3C</abbr> technical reports index</a> at https://www.w3.org/TR/.</em></p>
<p>The working group maintains <a href="https://github.com/w3c/media-source/issues">a list of all bug reports</a>. New features for this specification are expected to be incubated in the <a href="https://www.w3.org/community/wicg/">Web Platform Incubator Community Group</a>.</p>
<p>One editorial issue (<a href="https://github.com/w3c/media-source/issues/168">removing the exposure of <code>createObjectURL(mediaSource)</code> in workers</a>) was addressed since the previous publication. For the list of changes done since the previous version, see the <a href="https://github.com/w3c/media-source/commits/gh-pages">commits</a>.</p>
<p>
By publishing this Recommendation, <abbr title="World Wide Web Consortium">W3C</abbr> expects the functionality specified in this Recommendation will not be affected by changes to File API. The Working Group will continue to track these specifications.
</p>
<p>
This document was published by the <a href="https://www.w3.org/html/wg/">HTML Media Extensions Working Group</a> as an
Editor's Draft.
</p><p>