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  <h1 class="title" id="title">Core Mobile Web Platform — 2012</h1>
  
  <h2 id="draft-community-group-specification-29-august-2012">Draft Community Group Specification 29 August 2012</h2>
  <dl>
    
    
      <dt>Latest editor's draft:</dt>
      <dd><a href="http://coremob.github.com/coremob-2012/">http://coremob.github.com/coremob-2012/</a></dd>
    
    
        <dt>Previous editor's draft:</dt>
        <dd><a href="http://coremob.github.com/coremob-2012/ED-coremob-20120801.html">http://coremob.github.com/coremob-2012/ED-coremob-20120801.html</a></dd>
      
    
    <dt>Editors:</dt>
    <dd><span>Tobie Langel</span>, <a href="http://facebook.com/">Facebook</a></dd>
<dd><a href="http://berjon.com/">Robin Berjon</a>, <a href="http://robineko.com/">Robineko</a></dd>

    
  </dl>
  
  <p class="copyright">
    <a href="http://www.w3.org/Consortium/Legal/ipr-notice#Copyright">Copyright</a> © 
    2012
    the Contributors to the Core Mobile Web Platform — 2012 Specification, published by the
    <a href="http://www.w3.org/community/coremob/">Core Mobile Web Platform Community Group</a> under the
    
      <a href="https://www.w3.org/community/about/agreements/cla/">W3C Community Contributor License Agreement (CLA)</a>.
      A human-readable <a href="http://www.w3.org/community/about/agreements/cla-deed/">summary</a> is available.
    
  </p>
  <hr>
</div>
    <section id="abstract" class="introductory"><h2>Abstract</h2>
      <p>
        This specification describes the core set of technologies that define the baseline platform
        for mobile Web applications to target. It does not create any new technology but rather syndicates
        them into a globally coherent view of the mobile Web platform.
      </p>
    </section><section id="sotd" class="introductory"><h2>Status of This Document</h2>
  <p>
    This specification was published by the <a href="http://www.w3.org/community/coremob/">Core Mobile Web Platform Community Group</a>.
    It is not a W3C Standard nor is it on the W3C Standards Track.
    
      Please note that under the 
      <a href="https://www.w3.org/community/about/agreements/cla/">W3C Community Contributor License Agreement (CLA)</a>
      there is a limited opt-out and other conditions apply.
    
    Learn more about 
    <a href="http://www.w3.org/community/">W3C Community and Business Groups</a>.
  </p>
  
      <p>Notes are non-normative.</p>
      <p>
        Development of this document happens on <a href="https://github.com/coremob/level-1">GitHub</a>.
        Please file well-scoped <a href="https://github.com/coremob/level-1/issues">issues</a> and send
        <a href="https://github.com/coremob/level-1/pulls">pull requests</a> directly on GitHub. Please
        send comments to the mailing list.
      </p>
    
</section><section id="toc"><h2 class="introductory">Table of Contents</h2><ul class="toc"><li class="tocline"><a href="#introduction" class="tocxref"><span class="secno">1. </span>Introduction</a></li><li class="tocline"><a href="#markup" class="tocxref"><span class="secno">2. </span>Markup</a><ul class="toc"><li class="tocline"><a href="#html5" class="tocxref"><span class="secno">2.1 </span>HTML5</a></li><li class="tocline"><a href="#html-media-capture" class="tocxref"><span class="secno">2.2 </span>HTML Media Capture</a></li><li class="tocline"><a href="#svg" class="tocxref"><span class="secno">2.3 </span>SVG</a></li><li class="tocline"><a href="#meta-elements" class="tocxref"><span class="secno">2.4 </span><code>meta</code> Elements</a></li><li class="tocline"><a href="#application-configuration" class="tocxref"><span class="secno">2.5 </span>Application Configuration</a></li><li class="tocline"><a href="#view-orientation" class="tocxref"><span class="secno">2.6 </span>View Orientation</a></li><li class="tocline"><a href="#chromeless-mode" class="tocxref"><span class="secno">2.7 </span>Chromeless Mode</a></li></ul></li><li class="tocline"><a href="#style" class="tocxref"><span class="secno">3. </span>Style</a><ul class="toc"><li class="tocline"><a href="#css-2.1" class="tocxref"><span class="secno">3.1 </span>CSS 2.1</a></li><li class="tocline"><a href="#processing" class="tocxref"><span class="secno">3.2 </span>Processing</a><ul class="toc"><li class="tocline"><a href="#values" class="tocxref"><span class="secno">3.2.1 </span>Values</a></li><li class="tocline"><a href="#media-queries" class="tocxref"><span class="secno">3.2.2 </span>Media Queries</a></li><li class="tocline"><a href="#selectors" class="tocxref"><span class="secno">3.2.3 </span>Selectors</a></li></ul></li><li class="tocline"><a href="#graphical" class="tocxref"><span class="secno">3.3 </span>Graphical</a><ul class="toc"><li class="tocline"><a href="#backgrounds-and-borders" class="tocxref"><span class="secno">3.3.1 </span>Backgrounds and Borders</a></li><li class="tocline"><a href="#color" class="tocxref"><span class="secno">3.3.2 </span>Color</a></li><li class="tocline"><a href="#image-values-and-replaced-content" class="tocxref"><span class="secno">3.3.3 </span>Image Values and Replaced Content</a></li></ul></li><li class="tocline"><a href="#layout" class="tocxref"><span class="secno">3.4 </span>Layout</a><ul class="toc"><li class="tocline"><a href="#flexbox" class="tocxref"><span class="secno">3.4.1 </span>Flexbox</a></li><li class="tocline"><a href="#transforms" class="tocxref"><span class="secno">3.4.2 </span>Transforms</a></li></ul></li><li class="tocline"><a href="#typography" class="tocxref"><span class="secno">3.5 </span>Typography</a><ul class="toc"><li class="tocline"><a href="#css-fonts" class="tocxref"><span class="secno">3.5.1 </span>CSS Fonts</a></li><li class="tocline"><a href="#woff" class="tocxref"><span class="secno">3.5.2 </span><acronym title="Web Open Font Format">WOFF</acronym></a></li><li class="tocline"><a href="#css-text" class="tocxref"><span class="secno">3.5.3 </span>CSS Text</a></li></ul></li><li class="tocline"><a href="#animations-and-transitions" class="tocxref"><span class="secno">3.6 </span>Animations and Transitions</a><ul class="toc"><li class="tocline"><a href="#animations" class="tocxref"><span class="secno">3.6.1 </span>Animations</a></li><li class="tocline"><a href="#transitions" class="tocxref"><span class="secno">3.6.2 </span>Transitions</a></li></ul></li></ul></li><li class="tocline"><a href="#scripting" class="tocxref"><span class="secno">4. </span>Scripting</a><ul class="toc"><li class="tocline"><a href="#ecmascript" class="tocxref"><span class="secno">4.1 </span>ECMAScript</a></li><li class="tocline"><a href="#dom" class="tocxref"><span class="secno">4.2 </span>DOM</a><ul class="toc"><li class="tocline"><a href="#dom4" class="tocxref"><span class="secno">4.2.1 </span>DOM4</a></li><li class="tocline"><a href="#selectors-1" class="tocxref"><span class="secno">4.2.2 </span>Selectors</a></li><li class="tocline"><a href="#touch-events" class="tocxref"><span class="secno">4.2.3 </span>Touch Events</a></li><li class="tocline"><a href="#cssom-view" class="tocxref"><span class="secno">4.2.4 </span>CSSOM View</a></li></ul></li><li class="tocline"><a href="#storage" class="tocxref"><span class="secno">4.3 </span>Storage</a><ul class="toc"><li class="tocline"><a href="#web-storage" class="tocxref"><span class="secno">4.3.1 </span>Web Storage</a></li><li class="tocline"><a href="#indexed-database" class="tocxref"><span class="secno">4.3.2 </span>Indexed Database</a></li><li class="tocline"><a href="#file" class="tocxref"><span class="secno">4.3.3 </span>File</a></li><li class="tocline"><a href="#quota-management" class="tocxref"><span class="secno">4.3.4 </span>Quota Management</a></li></ul></li><li class="tocline"><a href="#networking" class="tocxref"><span class="secno">4.4 </span>Networking</a><ul class="toc"><li class="tocline"><a href="#xmlhttprequest" class="tocxref"><span class="secno">4.4.1 </span>XMLHttpRequest</a></li><li class="tocline"><a href="#web-messaging" class="tocxref"><span class="secno">4.4.2 </span>Web Messaging</a></li><li class="tocline"><a href="#web-workers" class="tocxref"><span class="secno">4.4.3 </span>Web Workers</a></li></ul></li><li class="tocline"><a href="#sensors" class="tocxref"><span class="secno">4.5 </span>Sensors</a><ul class="toc"><li class="tocline"><a href="#geolocation" class="tocxref"><span class="secno">4.5.1 </span>Geolocation</a></li><li class="tocline"><a href="#deviceorientation-event" class="tocxref"><span class="secno">4.5.2 </span>DeviceOrientation Event</a></li></ul></li><li class="tocline"><a href="#multimedia" class="tocxref"><span class="secno">4.6 </span>Multimedia</a><ul class="toc"><li class="tocline"><a href="#canvas2d" class="tocxref"><span class="secno">4.6.1 </span>Canvas2D</a></li><li class="tocline"><a href="#timing-control-for-script-based-animations" class="tocxref"><span class="secno">4.6.2 </span>Timing control for script-based animations</a></li></ul></li></ul></li><li class="tocline"><a href="#network" class="tocxref"><span class="secno">5. </span>Network</a><ul class="toc"><li class="tocline"><a href="#http" class="tocxref"><span class="secno">5.1 </span>HTTP</a></li><li class="tocline"><a href="#cors" class="tocxref"><span class="secno">5.2 </span>CORS</a></li><li class="tocline"><a href="#data-scheme" class="tocxref"><span class="secno">5.3 </span><code>data:</code> scheme</a></li><li class="tocline"><a href="#mailto-scheme" class="tocxref"><span class="secno">5.4 </span><code>mailto:</code> scheme</a></li><li class="tocline"><a href="#tel-scheme" class="tocxref"><span class="secno">5.5 </span><code>tel:</code> scheme</a></li><li class="tocline"><a href="#sms-scheme" class="tocxref"><span class="secno">5.6 </span><code>sms:</code> scheme</a></li><li class="tocline"><a href="#mmsto-scheme" class="tocxref"><span class="secno">5.7 </span><code>mmsto:</code> scheme</a></li></ul></li><li class="tocline"><a href="#references" class="tocxref"><span class="secno">A. </span>References</a><ul class="toc"><li class="tocline"><a href="#normative-references" class="tocxref"><span class="secno">A.1 </span>Normative references</a></li><li class="tocline"><a href="#informative-references" class="tocxref"><span class="secno">A.2 </span>Informative references</a></li></ul></li></ul></section>
    
    <section class="informative" id="introduction">
      <!--OddPage--><h2><span class="secno">1. </span>Introduction</h2><p><em>This section is non-normative.</em></p>
      <p>
        The goal of the Core Mobile Web Platform Community Group is to accelerate the adoption of the Mobile Web as a compelling platform for the development of modern mobile Web applications. In order to achieve this mission, the CG brings developers, equipment manufacturers, browser vendors, operators and other relevant members of the industry together to agree on core features developers can depend on.</p>

        <p>This specification is the result of this work. It attempts to carefully balances developer needs and implementation constraints as of today. Updated versions of this document will be released as the platform evolves and new technologies become broadly available.
        </p>
    </section>
    <section id="markup">
      <!--OddPage--><h2><span class="secno">2. </span>Markup</h2>
      <p>This section describes requirements for markup languages and related features.</p>

      <section id="html5">
        <h3><span class="secno">2.1 </span>HTML5</h3>
        <p>User agents <em class="rfc2119" title="must">must</em> support HTML5 [<cite><a class="bibref" href="#bib-HTML5">HTML5</a></cite>].</p>
        <div class="issue"><div class="issue-title"><span>Issue 1</span></div><p class="">Some <a href="https://www.w3.org/Bugs/Public/show_bug.cgi?id=14702">critical AppCache issues</a> are being <a href="http://html5.org/tools/web-apps-tracker?from=7135&amp;to=7136">fixed</a> in the HTML Living Standard spec. Unfortunately, these fixes aren't brought (yet) to the HTML5 spec because they are considered new features belonging in HTML.next. What should the group's position be with regards to that?</p></div>
        <div class="note"><div class="note-title"><span>Note</span></div><p class="">Implementors should pay particular attention to the quality of implementation of the <code>audio</code> element. <code>audio</code> elements are commonly used in games to play background music and sound effects. It is recommended that implementations support playing 8 audio files in parallel without audible artifacts and provide sub 10ms latency.</p></div>
        <div class="issue"><div class="issue-title"><span>Issue 2</span></div><p class="">Can the latency requirements be lightened a bit. Sub 10ms seems ideal, slightly longer latency times may be acceptable for most use cases.</p></div>
      </section>

      <section id="html-media-capture">
        <h3><span class="secno">2.2 </span>HTML Media Capture</h3>
        <p>User agents <em class="rfc2119" title="must">must</em> support HTML Media Capture [<cite><a class="bibref" href="#bib-HTMLMEDIACAPTURE">HTMLMEDIACAPTURE</a></cite>].</p>
      </section>

      <section id="svg">
        <h3><span class="secno">2.3 </span>SVG</h3>
        <p>User agents <em class="rfc2119" title="must">must</em> support Scalable Vector Graphics (SVG) 1.1 (Second Edition) [<cite><a class="bibref" href="#bib-SVG11">SVG11</a></cite>].</p>
      </section>

      <section id="meta-elements">
        <h3><span class="secno">2.4 </span><code>meta</code> Elements</h3>
        <p>User agents <em class="rfc2119" title="must">must</em> support CSS Device Adaptation [<cite><a class="bibref" href="#bib-CSS-ADAPTATION">CSS-ADAPTATION</a></cite>] as specified through a <code>meta</code> viewport element.</p>
      </section>

      <section id="application-configuration">
        <h3><span class="secno">2.5 </span>Application Configuration</h3>
        <div class="issue"><div class="issue-title"><span>Issue 6</span></div><p class="">WebApps WG is <a href="http://www.w3.org/2012/webapps/charter/Overview.html#deliverables">chartered</a> to work on this and has two related specs: Widget Packaging and Configuration [<cite><a class="bibref" href="#bib-WIDGETS">WIDGETS</a></cite>] (which has had little traction among the main vendors), and Web Application Manifest Format and Management APIs [<cite><a class="bibref" href="#bib-WEBAPPS-MANIFEST-API">WEBAPPS-MANIFEST-API</a></cite>] (which is still an early Editor's draft).</p></div>
      </section>

      <section id="view-orientation">
        <h3><span class="secno">2.6 </span>View Orientation</h3>
        <div class="issue"><div class="issue-title"><span>Issue 7</span></div><p class="">This is a new deliverable of the WebApps WG. See the WG's <a href="http://www.w3.org/2012/webapps/charter/">charter</a> for details. No spec to link to for the moment. Could also end up as an attribute of <a href="#application-configuration">Application Configuration</a>.</p></div>
      </section>

      <section id="chromeless-mode">
        <h3><span class="secno">2.7 </span>Chromeless Mode</h3>
        <div class="issue"><div class="issue-title"><span>Issue 8</span></div><p class="">Within the scope of the WebApps WG's <a href="http://www.w3.org/2012/webapps/charter/">charter</a>. Could end up as an attribute of <a href="#application-configuration">Application Configuration</a>.</p></div>
      </section>
    </section>

    <section id="style">
      <!--OddPage--><h2><span class="secno">3. </span>Style</h2>
      <p>This section defines requirements for CSS and other, styling-related features.</p>

      <section id="css-2.1">
        <h3><span class="secno">3.1 </span>CSS 2.1</h3>
        <p>User agents <em class="rfc2119" title="must">must</em> support CSS 2.1 [<cite><a class="bibref" href="#bib-CSS21">CSS21</a></cite>].</p>
      </section>

      <section id="processing">
        <h3><span class="secno">3.2 </span>Processing</h3>
        <section id="values">
          <h4><span class="secno">3.2.1 </span>Values</h4>
          <p>User agents <em class="rfc2119" title="must">must</em> support CSS Values [<cite><a class="bibref" href="#bib-CSS3VAL">CSS3VAL</a></cite>].</p>
          <div class="issue"><div class="issue-title"><span>Issue 9</span></div><p class="">CSS Values is a WD. Most of the common content of CSS Values is already included in CSS 2.1. There are some features that would be welcomed additions, notably <code>calc()</code>, <code>rem</code> unit, but also some that don't seem to have a lot of traction (e.g. <code>cycle()</code>).</p></div>
        </section>
        <section id="media-queries">
          <h4><span class="secno">3.2.2 </span>Media Queries</h4>
          <p>User agents <em class="rfc2119" title="must">must</em> support CSS Media Queries [<cite><a class="bibref" href="#bib-CSS3-MEDIAQUERIES">CSS3-MEDIAQUERIES</a></cite>].</p>
        </section>
        <section id="selectors">
          <h4><span class="secno">3.2.3 </span>Selectors</h4>
          <p>User agents <em class="rfc2119" title="must">must</em> support CSS Selectors Level 3 [<cite><a class="bibref" href="#bib-SELECTORS">SELECTORS</a></cite>].</p>
        </section>
        <div class="issue"><div class="issue-title"><span>Issue 11</span></div><p class="">Request for momentum scrolling (e.g. <code>-webkit-overflow-scrolling: touch</code>) are extremely common. Unfortunately, there is no spec effort at this point.</p></div>
      </section>

      <section id="graphical">
        <h3><span class="secno">3.3 </span>Graphical</h3>
        <section id="backgrounds-and-borders">
          <h4><span class="secno">3.3.1 </span>Backgrounds and Borders</h4>
          <p>User agents <em class="rfc2119" title="must">must</em> support CSS Backgrounds and Borders [<cite><a class="bibref" href="#bib-CSS3-BG">CSS3-BG</a></cite>].</p>
        </section>
        <section id="color">
          <h4><span class="secno">3.3.2 </span>Color</h4>
          <p>User agents <em class="rfc2119" title="must">must</em> support CSS Color [<cite><a class="bibref" href="#bib-CSS3COLOR">CSS3COLOR</a></cite>].</p>
        </section>
        <section id="image-values-and-replaced-content">
          <h4><span class="secno">3.3.3 </span>Image Values and Replaced Content</h4>
          <p>User agents <em class="rfc2119" title="must">must</em> support CSS Image Values and Replaced Content [<cite><a class="bibref" href="#bib-CSS3-IMAGES">CSS3-IMAGES</a></cite>].</p>
          <div class="issue"><div class="issue-title"><span>Issue 10</span></div><p class="">CSS Image Values is a CR. Questionable content is marked at risk, which is reassuring.</p></div>
        </section>
      </section>

      <section id="layout">
        <h3><span class="secno">3.4 </span>Layout</h3>
        <section id="flexbox">
          <h4><span class="secno">3.4.1 </span>Flexbox</h4>
          <p>User agents <em class="rfc2119" title="must">must</em> support CSS Flexible Box Layout [<cite><a class="bibref" href="#bib-FLEXBOX">FLEXBOX</a></cite>].</p>
        </section>
        <section id="transforms">
          <h4><span class="secno">3.4.2 </span>Transforms</h4>
          <p>User agents <em class="rfc2119" title="must">must</em> support CSS Transforms [<cite><a class="bibref" href="#bib-CSS3-TRANSFORMS">CSS3-TRANSFORMS</a></cite>].</p>
        </section>
      </section>

      <section id="typography">
        <h3><span class="secno">3.5 </span>Typography</h3>
        <section id="css-fonts">
          <h4><span class="secno">3.5.1 </span>CSS Fonts</h4>
          <p>User agents <em class="rfc2119" title="must">must</em> support CSS Fonts [<cite><a class="bibref" href="#bib-CSS3-FONTS">CSS3-FONTS</a></cite>].</p>
        </section>
        <section id="woff">
          <h4><span class="secno">3.5.2 </span><acronym title="Web Open Font Format">WOFF</acronym></h4>
          <p>User agents <em class="rfc2119" title="must">must</em> support <acronym title="Web Open Font Format">WOFF</acronym> [<cite><a class="bibref" href="#bib-WOFF">WOFF</a></cite>].</p>
        </section>
        <section id="css-text">
          <h4><span class="secno">3.5.3 </span>CSS Text</h4>
          <p>User agents <em class="rfc2119" title="must">must</em> support CSS Text [<cite><a class="bibref" href="#bib-CSS3TEXT">CSS3TEXT</a></cite>].</p>
          <div class="issue"><div class="issue-title"><span>Issue 13</span></div><p class="">Spec in WD. We're interested in a small subset of CSS Text, mainly text-shadow. Like CSS Values, a lot what is of interest is already covered by CSS 2.1.</p></div>
        </section>
      </section>

      <section id="animations-and-transitions">
        <h3><span class="secno">3.6 </span>Animations and Transitions</h3>
        <section id="animations">
          <h4><span class="secno">3.6.1 </span>Animations</h4>
          <p>User agents <em class="rfc2119" title="must">must</em> support CSS Animations [<cite><a class="bibref" href="#bib-CSS3-ANIMATIONS">CSS3-ANIMATIONS</a></cite>].</p>
        </section>
        <section id="transitions">
          <h4><span class="secno">3.6.2 </span>Transitions</h4>
          <p>User agents <em class="rfc2119" title="must">must</em> support CSS Transitions [<cite><a class="bibref" href="#bib-CSS3-TRANSITIONS">CSS3-TRANSITIONS</a></cite>].</p>
        </section>
      </section>
    </section>

    <section id="scripting">
      <!--OddPage--><h2><span class="secno">4. </span>Scripting</h2>
      <p>This section defines which scripting support in language and APIs are required.</p>

      <section id="ecmascript">
        <h3><span class="secno">4.1 </span>ECMAScript</h3>
        <p>User agents <em class="rfc2119" title="must">must</em> support ECMAScript, Edition 5.1 [<cite><a class="bibref" href="#bib-ECMA-262-51">ECMA-262-51</a></cite>].</p>
      </section>

      <section id="dom">
        <h3><span class="secno">4.2 </span>DOM</h3>
        <section id="dom4">
          <h4><span class="secno">4.2.1 </span>DOM4</h4>
          <p>User agents <em class="rfc2119" title="must">must</em> support the DOM4 API [<cite><a class="bibref" href="#bib-DOM4">DOM4</a></cite>].</p>
        </section>
        <section id="selectors-1">
          <h4><span class="secno">4.2.2 </span>Selectors</h4>
          <p>User agents <em class="rfc2119" title="must">must</em> support the Selectors API level 2 [<cite><a class="bibref" href="#bib-SELECTORS-API2">SELECTORS-API2</a></cite>].</p>
        </section>
        <section id="touch-events">
          <h4><span class="secno">4.2.3 </span>Touch Events</h4>
          <p>User agents <em class="rfc2119" title="should">should</em> support Touch Events version 1 [<cite><a class="bibref" href="#bib-TOUCH-EVENTS">TOUCH-EVENTS</a></cite>].</p>
        </section>
        <section id="cssom-view">
          <h4><span class="secno">4.2.4 </span>CSSOM View</h4>
          <p>User agents <em class="rfc2119" title="must">must</em> support CSSOM View [<cite><a class="bibref" href="#bib-CSSOM-VIEW">CSSOM-VIEW</a></cite>].</p>
        </section>
      </section>

      <section id="storage">
        <h3><span class="secno">4.3 </span>Storage</h3>
        <section id="web-storage">
          <h4><span class="secno">4.3.1 </span>Web Storage</h4>
          <p>User agents <em class="rfc2119" title="must">must</em> support the Web Storage API [<cite><a class="bibref" href="#bib-WEBSTORAGE">WEBSTORAGE</a></cite>].</p>
        </section>
        <section id="indexed-database">
          <h4><span class="secno">4.3.2 </span>Indexed Database</h4>
          <p>User agents <em class="rfc2119" title="must">must</em> support the Indexed Database API [<cite><a class="bibref" href="#bib-INDEXEDDB">INDEXEDDB</a></cite>].</p>
        </section>
        <section id="file">
          <h4><span class="secno">4.3.3 </span>File</h4>
          <p>User agents <em class="rfc2119" title="must">must</em> support the File API [<cite><a class="bibref" href="#bib-FILE-API">FILE-API</a></cite>].</p>
        </section>
        <section id="quota-management">
          <h4><span class="secno">4.3.4 </span>Quota Management</h4>
          <p>User agents <em class="rfc2119" title="must">must</em> support the Quota Management API [<cite><a class="bibref" href="#bib-QUOTA-API">QUOTA-API</a></cite>].</p>
        </section>
      </section>

      <section id="networking">
        <h3><span class="secno">4.4 </span>Networking</h3>
        <section id="xmlhttprequest">
          <h4><span class="secno">4.4.1 </span>XMLHttpRequest</h4>
          <p>User agents <em class="rfc2119" title="must">must</em> support the XMLHttpRequest API [<cite><a class="bibref" href="#bib-XMLHTTPREQUEST">XMLHTTPREQUEST</a></cite>].</p>
          <div class="issue"><div class="issue-title"><span>Issue 14</span></div><p class="">The Editor folded level 1 and 2 in the same spec recently, but this isn't reflected in /TR yet.</p></div>
        </section>
        <section id="web-messaging">
          <h4><span class="secno">4.4.2 </span>Web Messaging</h4>
          <p>User agents <em class="rfc2119" title="must">must</em> support the Web Messaging API [<cite><a class="bibref" href="#bib-POSTMSG">POSTMSG</a></cite>].</p>
        </section>
        <section id="web-workers">
          <h4><span class="secno">4.4.3 </span>Web Workers</h4>
          <p>User agents <em class="rfc2119" title="must">must</em> support the Web Workers API [<cite><a class="bibref" href="#bib-WEBWORKERS">WEBWORKERS</a></cite>].</p>
          <div class="issue"><div class="issue-title"><span>Issue 15</span></div><p class="">Do we need both Shared and Web Workers?</p></div>
        </section>
      </section>

      <section id="sensors">
        <h3><span class="secno">4.5 </span>Sensors</h3>
        <section id="geolocation">
          <h4><span class="secno">4.5.1 </span>Geolocation</h4>
          <p>User agents <em class="rfc2119" title="must">must</em> support the Geolocation API [<cite><a class="bibref" href="#bib-GEOLOCATION-API">GEOLOCATION-API</a></cite>].</p>
        </section>
        <section id="deviceorientation-event">
          <h4><span class="secno">4.5.2 </span>DeviceOrientation Event</h4>
          <p>User agents <em class="rfc2119" title="must">must</em> support the DeviceOrientation Event [<cite><a class="bibref" href="#bib-DEVICE-ORIENTATION">DEVICE-ORIENTATION</a></cite>].</p>
        </section>
      </section>

      <section id="multimedia">
        <h3><span class="secno">4.6 </span>Multimedia</h3>
        <section id="canvas2d">
          <h4><span class="secno">4.6.1 </span>Canvas2D</h4>
          <p>User agents <em class="rfc2119" title="must">must</em> support the Canvas2D API [<cite><a class="bibref" href="#bib-CANVAS-2D">CANVAS-2D</a></cite>].</p>
          <div class="note"><div class="note-title"><span>Note</span></div><p class="">Implementors should pay attention to the performance characteristics of the <code>canvas</code> element which is particularly well suited for the development of 2D and isometric games. In order to meet the expectations of users, implementations should be capable of running such games at 30fps in full-screen mode.</p></div>
        </section>
        <section id="timing-control-for-script-based-animations">
          <h4><span class="secno">4.6.2 </span>Timing control for script-based animations</h4>
          <p>User agents <em class="rfc2119" title="must">must</em> support the Timing control for script-based animations API [<cite><a class="bibref" href="#bib-ANIMATION-TIMING">ANIMATION-TIMING</a></cite>].</p>
        </section>
      </section>

    </section>
    <section id="network">
      <!--OddPage--><h2><span class="secno">5. </span>Network</h2>
      <section id="http">
        <h3><span class="secno">5.1 </span>HTTP</h3>
        <p>User agents <em class="rfc2119" title="must">must</em> support HTTP 1.1 [<cite><a class="bibref" href="#bib-HTTP11">HTTP11</a></cite>].</p>
      </section>
      <section id="cors">
        <h3><span class="secno">5.2 </span>CORS</h3>
        <p>User agents <em class="rfc2119" title="must">must</em> support Cross-Origin Resource Sharing [<cite><a class="bibref" href="#bib-CORS">CORS</a></cite>].</p>
      </section>
      <section id="data-scheme">
        <h3><span class="secno">5.3 </span><code>data:</code> scheme</h3>
        <p>User agents <em class="rfc2119" title="must">must</em> support the <code>data:</code> URI scheme [<cite><a class="bibref" href="#bib-RFC2397">RFC2397</a></cite>].</p>
      </section>
      <section id="mailto-scheme">
        <h3><span class="secno">5.4 </span><code>mailto:</code> scheme</h3>
        <p>User agents <em class="rfc2119" title="must">must</em> support the <code>mailto:</code> URI scheme [<cite><a class="bibref" href="#bib-RFC6068">RFC6068</a></cite>].</p>
      </section>
      <section id="tel-scheme">
        <h3><span class="secno">5.5 </span><code>tel:</code> scheme</h3>
        <p>User agents <em class="rfc2119" title="must">must</em> support the <code>tel:</code> URI scheme [<cite><a class="bibref" href="#bib-RFC3966">RFC3966</a></cite>].</p>
      </section>
      <section id="sms-scheme">
        <h3><span class="secno">5.6 </span><code>sms:</code> scheme</h3>
        <p>User agents <em class="rfc2119" title="must">must</em> support the <code>sms:</code> URI scheme [<cite><a class="bibref" href="#bib-RFC5724">RFC5724</a></cite>].</p>
      </section>
      <section id="mmsto-scheme">
        <h3><span class="secno">5.7 </span><code>mmsto:</code> scheme</h3>
        <p>User agents <em class="rfc2119" title="must">must</em> support the <code>mmsto:</code> URI scheme [<cite><a class="bibref" href="#bib-OMA-URI-SCHEME">OMA-URI-SCHEME</a></cite>].</p>
      </section>
    </section>
  
  
<section id="references" class="appendix"><!--OddPage--><h2><span class="secno">A. </span>References</h2><section id="normative-references"><h3><span class="secno">A.1 </span>Normative references</h3><dl class="bibliography"><dt id="bib-ANIMATION-TIMING">[ANIMATION-TIMING]</dt><dd>James Robinson; Cameron McCormack. <a href="http://www.w3.org/TR/animation-timing/"><cite>Timing control for script-based animations.</cite></a> URL: <a href="http://www.w3.org/TR/animation-timing/">http://www.w3.org/TR/animation-timing/</a>
</dd><dt id="bib-CANVAS-2D">[CANVAS-2D]</dt><dd>Ian Hickson. <a href="http://www.w3.org/TR/2dcontext/"><cite>HTML Canvas 2D Context.</cite></a> 25 May 2011. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/2dcontext/">http://www.w3.org/TR/2dcontext/</a> 
</dd><dt id="bib-CORS">[CORS]</dt><dd>Anne van Kesteren. <a href="http://www.w3.org/TR/2009/WD-cors-20090317"><cite>Cross-Origin Resource Sharing.</cite></a> 17 March 2009. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/2009/WD-cors-20090317">http://www.w3.org/TR/2009/WD-cors-20090317</a> 
</dd><dt id="bib-CSS-ADAPTATION">[CSS-ADAPTATION]</dt><dd>Rune Lillesveen. <a href="http://dev.w3.org/csswg/css-device-adapt/">CSS Device Adaptation</a>. 23 January 2012. Editor's Draft. (Work in progress.) URL: <a href="http://dev.w3.org/csswg/css-device-adapt/">http://dev.w3.org/csswg/css-device-adapt/</a>
</dd><dt id="bib-CSS21">[CSS21]</dt><dd>Bert Bos; et al. <a href="http://www.w3.org/TR/CSS21/"><cite>Cascading Style Sheets Level 2 Revision 1 (CSS 2.1) Specification.</cite></a>. W3C Recommendation. URL: <a href="http://www.w3.org/TR/CSS21">http://www.w3.org/TR/CSS21/</a> 
</dd><dt id="bib-CSS3-ANIMATIONS">[CSS3-ANIMATIONS]</dt><dd>Dean Jackson (Apple Inc); David Hyatt (Apple Inc); Chris Marrin (Apple Inc). <a href="http://www.w3.org/TR/css3-animations/"><cite>CSS Animations.</cite></a> 03 April 2012. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/css3-animations/">http://www.w3.org/TR/css3-animations/</a> 
</dd><dt id="bib-CSS3-BG">[CSS3-BG]</dt><dd>Elika J. Etemad; Bert Bos; Brad Kemper. <a href="http://www.w3.org/TR/css3-background/"><cite>CSS Backgrounds and Borders Module Level 3.</cite></a> URL: <a href="http://www.w3.org/TR/css3-background/">http://www.w3.org/TR/css3-background/</a> 
</dd><dt id="bib-CSS3-FONTS">[CSS3-FONTS]</dt><dd>John Daggett (Mozilla). <a href="http://www.w3.org/TR/css3-fonts"><cite>CSS Fonts Module Level 3</cite></a> URL: <a href="http://www.w3.org/TR/css3-fonts">http://www.w3.org/TR/css3-fonts</a> 
</dd><dt id="bib-CSS3-IMAGES">[CSS3-IMAGES]</dt><dd>Elika J. Etemad, Tab Atkins Jr.. <a href="http://www.w3.org/TR/css3-images/">CSS Image Values and Replaced Content</a>. 17 April 2012. W3C Candidate Recommendation. URL: <a href="http://www.w3.org/TR/css3-images/">http://www.w3.org/TR/css3-images/</a>
</dd><dt id="bib-CSS3-MEDIAQUERIES">[CSS3-MEDIAQUERIES]</dt><dd>H. Lie, T. Çelik, D. Glazman, A. van Kesteren. <a href="http://www.w3.org/TR/css3-mediaqueries/"><cite>Media Queries</cite></a>  URL: <a href="http://www.w3.org/TR/css3-mediaqueries/">http://www.w3.org/TR/css3-mediaqueries/</a> 
</dd><dt id="bib-CSS3-TRANSFORMS">[CSS3-TRANSFORMS]</dt><dd>Simon Fraser; Dean Jackson; David Hyatt; Chris Marrin; Edward O'Connor; Dirk Schulze; Aryeh Gregor. <a href="http://www.w3.org/TR/css3-transforms/"><cite>CSS Transforms.</cite></a> URL: <a href="http://www.w3.org/TR/css3-transforms/">http://www.w3.org/TR/css3-transforms/</a> 
</dd><dt id="bib-CSS3-TRANSITIONS">[CSS3-TRANSITIONS]</dt><dd>Dean Jackson; David Hyatt; Chris Marrin; L. David Baron. <a href="http://www.w3.org/TR/css3-transitions/"><cite>CSS Transitions.</cite></a> 03 April 2012. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/css3-transitions/">http://www.w3.org/TR/css3-transitions/</a> 
</dd><dt id="bib-CSS3COLOR">[CSS3COLOR]</dt><dd>Tantek Çelik; Chris Lilley; L. David Baron. <a href="http://www.w3.org/TR/css3-color"><cite>CSS Color Module Level 3.</cite></a> 07 June 2011. W3C Recommendation. URL: <a href="http://www.w3.org/TR/css3-color">http://www.w3.org/TR/css3-color</a> 
</dd><dt id="bib-CSS3TEXT">[CSS3TEXT]</dt><dd>Elika J. Etemad; Koji Ishii. <a href="http://www.w3.org/TR/css3-text/"><cite>CSS Text Level 3.</cite></a> 19 January 2012. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/css3-text/">http://www.w3.org/TR/css3-text/</a> 
</dd><dt id="bib-CSS3VAL">[CSS3VAL]</dt><dd>Chris Lilley; Håkon Wium Lie. <a href="http://www.w3.org/TR/css3-values/"><cite>CSS3 Values and Units.</cite></a> 08 March 2012. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/css3-values/">http://www.w3.org/TR/css3-values/</a> 
</dd><dt id="bib-CSSOM-VIEW">[CSSOM-VIEW]</dt><dd>Anne van Kesteren. <a href="http://www.w3.org/TR/2008/WD-cssom-view-20080222"><cite>CSSOM View Module.</cite></a> 22 February 2008. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/2008/WD-cssom-view-20080222">http://www.w3.org/TR/2008/WD-cssom-view-20080222</a> 
</dd><dt id="bib-DEVICE-ORIENTATION">[DEVICE-ORIENTATION]</dt><dd>Steve Block, Andrei Popescu. <a href="http://www.w3.org/TR/2011/WD-orientation-event-20111201/">DeviceOrientation Event Specification</a>. 1 December 2011. Last Call Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/2011/WD-orientation-event-20111201/">http://www.w3.org/TR/2011/WD-orientation-event-20111201/</a>
</dd><dt id="bib-DOM4">[DOM4]</dt><dd>Anne van Kesteren; Aryeh Gregor; Ms2ger. <a href="http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html/"><cite>DOM4.</cite></a> URL: <a href="http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html/">http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html/</a> 
</dd><dt id="bib-ECMA-262-51">[ECMA-262-51]</dt><dd><a href="http://www.ecma-international.org/publications/standards/Ecma-262.htm">ECMAScript Language Specification, Edition 5.1</a>. June 2011. URL: <a href="http://www.ecma-international.org/publications/standards/Ecma-262.htm">http://www.ecma-international.org/publications/standards/Ecma-262.htm</a>
</dd><dt id="bib-FILE-API">[FILE-API]</dt><dd>Arun Ranganathan; Jonas Sicking. <a href="http://www.w3.org/TR/2011/WD-FileAPI-20111020/"><cite>File API.</cite></a> 20 October 2011. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/2011/WD-FileAPI-20111020/">http://www.w3.org/TR/2011/WD-FileAPI-20111020/</a> 
</dd><dt id="bib-FLEXBOX">[FLEXBOX]</dt><dd>Tab Atkins Jr.; Elika J. Etemad; Alex Mogilevsky. <a href="http://www.w3.org/TR/css3-flexbox/"><cite>Flexible Box Layout Module.</cite></a> 12 June 2012. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/css3-flexbox/">http://www.w3.org/TR/css3-flexbox/</a> 
</dd><dt id="bib-GEOLOCATION-API">[GEOLOCATION-API]</dt><dd>Andrei Popescu. <a href="http://www.w3.org/TR/2008/WD-geolocation-API-20081222/"><cite>Geolocation API Specification.</cite></a> 22 December 2008. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/2008/WD-geolocation-API-20081222/">http://www.w3.org/TR/2008/WD-geolocation-API-20081222/</a> 
</dd><dt id="bib-HTML5">[HTML5]</dt><dd>Ian Hickson; David Hyatt. <a href="http://www.w3.org/TR/html5"><cite>HTML5.</cite></a> 29 March 2012. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/html5">http://www.w3.org/TR/html5</a> 
</dd><dt id="bib-HTMLMEDIACAPTURE">[HTMLMEDIACAPTURE]</dt><dd>Anssi Kostiainen; Ilkka Oksanen; Dominique Hazaël-Massieux. <a href="http://www.w3.org/TR/2012/WD-html-media-capture-20120529/"><cite>HTML Media Capture.</cite></a> 29 May 2012. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/2012/WD-html-media-capture-20120529/">http://www.w3.org/TR/2012/WD-html-media-capture-20120529/</a>
</dd><dt id="bib-HTTP11">[HTTP11]</dt><dd>R. Fielding; et al. <a href="http://www.ietf.org/rfc/rfc2616.txt"><cite>Hypertext Transfer Protocol - HTTP/1.1.</cite></a> June 1999. Internet RFC 2616. URL: <a href="http://www.ietf.org/rfc/rfc2616.txt">http://www.ietf.org/rfc/rfc2616.txt</a> 
</dd><dt id="bib-INDEXEDDB">[INDEXEDDB]</dt><dd>Nikunj Mehta, Jonas Sicking, Eliot Graff, Andrei Popescu, Jeremy Orlow. <a href="http://www.w3.org/TR/IndexedDB/">Indexed Database API</a>. April 2011. Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/IndexedDB/">http://www.w3.org/TR/IndexedDB/</a>
</dd><dt id="bib-OMA-URI-SCHEME">[OMA-URI-SCHEME]</dt><dd><em>Reference not found.</em>
</dd><dt id="bib-POSTMSG">[POSTMSG]</dt><dd>Ian Hickson. <a href="http://dev.w3.org/html5/postmsg"><cite>HTML5 Web Messaging.</cite></a> URL: <a href="http://dev.w3.org/html5/postmsg">http://dev.w3.org/html5/postmsg</a>
</dd><dt id="bib-QUOTA-API">[QUOTA-API]</dt><dd>Kinuko Yasuda. <a href="http://www.w3.org/TR/quota-api/"><cite>Quota Management API</cite></a>. 3 July 2012. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/quota-api/">http://www.w3.org/TR/quota-api/</a>
</dd><dt id="bib-RFC2397">[RFC2397]</dt><dd>L. Masinter. <a href="http://www.ietf.org/rfc/rfc2397.txt"><cite>The "data" URL scheme.</cite></a> August 1998. Internet RFC 2397. URL: <a href="http://www.ietf.org/rfc/rfc2397.txt">http://www.ietf.org/rfc/rfc2397.txt</a> 
</dd><dt id="bib-RFC3966">[RFC3966]</dt><dd>H. Schulzrinne. <a href="http://www.ietf.org/rfc/rfc3966.txt"><cite>The tel URI for Telephone Numbers</cite></a> December 2004. Internet RFC 3966. URL: <a href="http://www.ietf.org/rfc/rfc3966.txt">http://www.ietf.org/rfc/rfc3966.txt</a> 
</dd><dt id="bib-RFC5724">[RFC5724]</dt><dd>E. Wilde, A. Vaha-Sipila. <a href="http://www.ietf.org/rfc/rfc5724.txt">URI Scheme for Global System for Mobile Communications (GSM) Short Message Service (SMS)</a>. January 2010. Request for Comments. URL: <a href="http://www.ietf.org/rfc/rfc5724.txt">http://www.ietf.org/rfc/rfc5724.txt</a>
</dd><dt id="bib-RFC6068">[RFC6068]</dt><dd>M. Duerst; L. Masinter; J. Zawinski. <a href="http://www.ietf.org/rfc/rfc6068.txt"><cite>The 'mailto' URI Scheme.</cite></a> October 2010. Internet Proposed Standard RFC 6068. URL: <a href="http://www.ietf.org/rfc/rfc6068.txt">http://www.ietf.org/rfc/rfc6068.txt</a> 
</dd><dt id="bib-SELECTORS">[SELECTORS]</dt><dd><em>Reference not found.</em>
</dd><dt id="bib-SELECTORS-API2">[SELECTORS-API2]</dt><dd>Lachlan Hunt. <a href="http://www.w3.org/TR/selectors-api2/">Selectors API Level 2</a>. 19 January 2010. Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/selectors-api2/">http://www.w3.org/TR/selectors-api2/</a>
</dd><dt id="bib-SVG11">[SVG11]</dt><dd>Erik Dahlström; et al. <a href="http://www.w3.org/TR/2011/REC-SVG11-20110816/"><cite>Scalable Vector Graphics (SVG) 1.1 (Second Edition).</cite></a> 16 August 2011. W3C Recommendation. URL: <a href="http://www.w3.org/TR/2011/REC-SVG11-20110816/">http://www.w3.org/TR/2011/REC-SVG11-20110816/</a> 
</dd><dt id="bib-TOUCH-EVENTS">[TOUCH-EVENTS]</dt><dd>Matt Brubeck; Sangwhan Moon; Doug Schepers; <a href="http://www.w3.org/TR/touch-events/"><cite>Touch Events version 1</cite></a> URL: <a href="http://www.w3.org/TR/touch-events/">http://www.w3.org/TR/touch-events</a>
</dd><dt id="bib-WEBSTORAGE">[WEBSTORAGE]</dt><dd>Ian Hickson. <a href="http://www.w3.org/TR/2009/WD-webstorage-20090910/"><cite>Web Storage.</cite></a> 10 September 2009. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/2009/WD-webstorage-20090910/">http://www.w3.org/TR/2009/WD-webstorage-20090910/</a> 
</dd><dt id="bib-WEBWORKERS">[WEBWORKERS]</dt><dd>Ian Hickson. <a href="http://www.w3.org/TR/2011/WD-workers-20110901/"><cite>Web Workers.</cite></a> 1 September 2011. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/2011/WD-workers-20110901/">http://www.w3.org/TR/2011/WD-workers-20110901/</a> 
</dd><dt id="bib-WOFF">[WOFF]</dt><dd>Jonathan Kew, Tal Leming, Erik van Blokland. <a href="http://www.w3.org/TR/WOFF/">WOFF File Format 1.0</a>. 04 August 2011. Candidate Recommendation. URL: <a href="http://www.w3.org/TR/WOFF/">http://www.w3.org/TR/WOFF/</a>
</dd><dt id="bib-XMLHTTPREQUEST">[XMLHTTPREQUEST]</dt><dd>Anne van Kesteren. <a href="http://www.w3.org/TR/2008/WD-XMLHttpRequest-20080415"><cite>The XMLHttpRequest Object.</cite></a> 15 April 2008. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/2008/WD-XMLHttpRequest-20080415">http://www.w3.org/TR/2008/WD-XMLHttpRequest-20080415</a> 
</dd></dl></section><section id="informative-references"><h3><span class="secno">A.2 </span>Informative references</h3><dl class="bibliography"><dt id="bib-WEBAPPS-MANIFEST-API">[WEBAPPS-MANIFEST-API]</dt><dd>Anant Narayanan. <a href="http://dvcs.w3.org/hg/app-manifest/raw-file/tip/index.html"><cite>Web Application Manifest Format and Management APIs</cite></a>. W3C Editor's Draft. (Work in progress.) URL: <a href="http://dvcs.w3.org/hg/app-manifest/raw-file/tip/index.html">http://dvcs.w3.org/hg/app-manifest/raw-file/tip/index.html</a> 
</dd><dt id="bib-WIDGETS">[WIDGETS]</dt><dd>Marcos Cáceres. <a href="http://www.w3.org/TR/widgets/"><cite>Widget Packaging and XML Configuration</cite></a>. W3C Recommendation. URL: <a href="http://www.w3.org/TR/widgets/">http://www.w3.org/TR/widgets/</a> 
</dd></dl></section></section><div id="respec-err" style="position: fixed; width: 350px; top: 10px; right: 10px; border: 3px double #f00; background: #fff" class="removeOnSave"><ul><li style="color: #c00">Got 2 tokens looking like a reference, not in biblio DB: </li><li style="color: #c00">Bad ref: OMA-URI-SCHEME, count = 1</li><li style="color: #c00">Bad ref: SELECTORS, count = 1</li></ul></div></body></html>