csswg-drafts/css-animations-2/Overview.html at fa7c77f9db9af0e1ca500b8a9fbcd84ca393ff7e · w3c/csswg-drafts · GitHub

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<!doctype html>
<html lang="en">
 <head>

  <meta content="text/html; charset=utf-8" http-equiv="Content-Type">


  <title>CSS Animations Level 2</title>


  <link href="../default.css" rel="stylesheet" type="text/css">


  <link href="../csslogo.ico" rel="shortcut icon" type="image/x-icon">


  <style>
  body {
    background: url("https://www.w3.org/StyleSheets/TR/logo-ED") top left no-repeat white;
    background-attachment: fixed;
    color: black;
    font-family: sans-serif;
    margin: 0 auto;
    max-width: 50em;
    padding: 2em 1em 2em 70px;
  }
  :link { color: #00C; background: transparent }
  :visited { color: #609; background: transparent }
  a[href]:active { color: #C00; background: transparent }
  a[href]:hover { background: #ffa }

  a[href] img { border-style: none }

  h1, h2, h3, h4, h5, h6 { text-align: left }
  h1, h2, h3 { color: #005A9C; }
  h1 { font: 170% sans-serif }
  h2 { font: 140% sans-serif }
  h3 { font: 120% sans-serif }
  h4 { font: bold 100% sans-serif }
  h5 { font: italic 100% sans-serif }
  h6 { font: small-caps 100% sans-serif }

  .hide { display: none }

  div.head { margin-bottom: 1em }
  div.head h1 { margin-top: 2em; clear: both }
  div.head table { margin-left: 2em; margin-top: 2em }

  p.copyright { font-size: small }
  p.copyright small { font-size: small }

  pre { margin-left: 2em }
  dt { font-weight: bold }

  ul.toc, ol.toc {
    list-style: none;
  }
  </style>


  <meta content="Bikeshed 1.0.0" name="generator">
 </head>


 <body class="h-entry">

  <div class="head">

   <p data-fill-with="logo"><a class="logo" href="http://www.w3.org/">
    <img alt="W3C" height="48" src="https://www.w3.org/Icons/w3c_home" width="72">
</a>
</p>

   <h1 class="p-name no-ref" id="title">CSS Animations Level 2</h1>

   <h2 class="no-num no-toc no-ref heading settled" id="subtitle"><span class="content">Editor’s Draft,
    <time class="dt-updated" datetime="2015-05-08">8 May 2015</time></span></h2>

   <div data-fill-with="spec-metadata">
    <dl>
     <dt>This version:
     <dd><a class="u-url" href="http://dev.w3.org/csswg/css-animations-2/">http://dev.w3.org/csswg/css-animations-2/</a>
     <dt>Feedback:
     <dd><span><a href="mailto:www-style@w3.org?subject=%5Bcss-animations-2%5D%20feedback">www-style@w3.org</a> with subject line “<kbd>[css-animations-2] <var>… message topic …</var></kbd>” (<a href="http://lists.w3.org/Archives/Public/www-style/" rel="discussion">archives</a>)</span>
     <dt class="editor">Editor:
     <dd class="editor p-author h-card vcard"><a class="p-name fn u-email email" href="mailto:dbaron@dbaron.org">L. David Baron</a> (<span class="p-org org">Mozilla</span>)
     <dt>Issues List:
     <dd><span><a href="https://www.w3.org/Bugs/Public/buglist.cgi?component=Animations&amp;list_id=36653&amp;product=CSS&amp;query_format=advanced&amp;resolution=---">In Bugzilla</a></span>
     <dd><span></span>
    </dl>
   </div>

   <div data-fill-with="warning"></div>

   <p class="copyright" data-fill-with="copyright"><a href="http://www.w3.org/Consortium/Legal/ipr-notice#Copyright">Copyright</a> © 2015 <a href="http://www.w3.org/"><abbr title="World Wide Web Consortium">W3C</abbr></a><sup>®</sup> (<a href="http://www.csail.mit.edu/"><abbr title="Massachusetts Institute of Technology">MIT</abbr></a>, <a href="http://www.ercim.eu/"><abbr title="European Research Consortium for Informatics and Mathematics">ERCIM</abbr></a>, <a href="http://www.keio.ac.jp/">Keio</a>, <a href="http://ev.buaa.edu.cn/">Beihang</a>). W3C <a href="http://www.w3.org/Consortium/Legal/ipr-notice#Legal_Disclaimer">liability</a>, <a href="http://www.w3.org/Consortium/Legal/ipr-notice#W3C_Trademarks">trademark</a> and <a href="http://www.w3.org/Consortium/Legal/copyright-documents">document use</a> rules apply.
</p>

   <hr title="Separator for header">
</div>


  <h2 class="no-num no-toc no-ref heading settled" id="abstract"><span class="content">Abstract</span></h2>

  <div class="p-summary" data-fill-with="abstract">
   <p>This CSS module describes a way for authors to animate the values of CSS properties over time, using keyframes. The behavior of these keyframe animations can be controlled by specifying their duration, number of repeats, and repeating behavior.</p>

<a href="http://www.w3.org/TR/CSS/">CSS</a> is a language for describing the rendering of structured documents
(such as HTML and XML)
on screen, on paper, in speech, etc.</div>


  <h2 class="no-num no-toc no-ref heading settled" id="status"><span class="content">Status of this document</span></h2>

  <div data-fill-with="status">
   <p>
	This is a public copy of the editors’ draft.
	It is provided for discussion only and may change at any moment.
	Its publication here does not imply endorsement of its contents by W3C.
	Don’t cite this document other than as work in progress.

</p>
   <p>
	The (<a href="http://lists.w3.org/Archives/Public/www-style/">archived</a>) public mailing list
	<a href="mailto:www-style@w3.org?Subject=%5Bcss-animations-2%5D%20PUT%20SUBJECT%20HERE">www-style@w3.org</a>
	(see <a href="http://www.w3.org/Mail/Request">instructions</a>)
	is preferred for discussion of this specification.
	When sending e-mail,
	please put the text “css-animations-2” in the subject,
	preferably like this:
	“[css-animations-2] <em>…summary of comment…</em>”

</p>
   <p>
	This document was produced by the <a href="http://www.w3.org/Style/CSS/members">CSS Working Group</a>
	(part of the <a href="http://www.w3.org/Style/">Style Activity</a>).

</p>
   <p>
	This document was produced by a group operating under
	the <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/">5 February 2004 W3C Patent Policy</a>.
	W3C maintains a <a href="http://www.w3.org/2004/01/pp-impl/32061/status" rel="disclosure">public list of any patent disclosures</a>
	made in connection with the deliverables of the group;
	that page also includes instructions for disclosing a patent.
	An individual who has actual knowledge of a patent which the individual believes contains <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/#def-essential">Essential Claim(s)</a>
	must disclose the information in accordance with <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/#sec-Disclosure">section 6 of the W3C Patent Policy</a>.

</p>
   <p>
	This document is governed by the <a href="http://www.w3.org/2014/Process-20140801/" id="w3c_process_revision">1 August 2014 W3C Process Document</a>.

</p>
   <p>

</p></div>

  <div data-fill-with="at-risk"></div>


  <h2 class="no-num no-toc no-ref heading settled" id="contents"><span class="content">Table of Contents</span></h2>

  <div data-fill-with="table-of-contents" role="navigation">
   <ul class="toc" role="directory">
    <li><a href="#delta"><span class="secno">1</span> <span class="content">Delta specification</span></a>
    <li><a href="#events"><span class="secno">2</span> <span class="content">Animation Events</span></a>
     <ul class="toc">
      <li><a href="#event-animationevent"><span class="secno">2.1</span> <span class="content">Types of <code>AnimationEvent</code></span></a>
     </ul>
    <li><a href="#conformance"><span class="secno"></span> <span class="content">
Conformance</span></a>
     <ul class="toc">
      <li><a href="#conventions"><span class="secno"></span> <span class="content">
Document conventions</span></a>
      <li><a href="#conformance-classes"><span class="secno"></span> <span class="content">
Conformance classes</span></a>
      <li><a href="#partial"><span class="secno"></span> <span class="content">
Partial implementations</span></a>
      <li><a href="#experimental"><span class="secno"></span> <span class="content">
Experimental implementations</span></a>
      <li><a href="#testing"><span class="secno"></span> <span class="content">
Non-experimental implementations</span></a>
     </ul>
    <li><a href="#index"><span class="secno"></span> <span class="content">Index</span></a>
     <ul class="toc">
      <li><a href="#index-defined-here"><span class="secno"></span> <span class="content">Terms defined by this specification</span></a>
      <li><a href="#index-defined-elsewhere"><span class="secno"></span> <span class="content">Terms defined by reference</span></a>
     </ul>
    <li><a href="#references"><span class="secno"></span> <span class="content">References</span></a>
     <ul class="toc">
      <li><a href="#normative"><span class="secno"></span> <span class="content">Normative References</span></a>
     </ul>
   </ul></div>

  <main>


   <h2 class="heading settled" data-level="1" id="delta"><span class="secno">1. </span><span class="content">Delta specification</span><a class="self-link" href="#delta"></a></h2>


   <p>This is a delta specification, meaning that it currently contains
only the differences from CSS Animations Level 1 <a data-link-type="biblio" href="#biblio-css3-animations">[CSS3-ANIMATIONS]</a>.
Once the Level 1 specification is closer to complete, it will be merged
with the additions here into a complete level 2 specification.</p>


   <h2 class="heading settled" data-level="2" id="events"><span class="secno">2. </span><span class="content">Animation Events</span><a class="self-link" href="#events"></a></h2>


   <h3 class="heading settled" data-level="2.1" id="event-animationevent"><span class="secno">2.1. </span><span class="content">Types of <code>AnimationEvent</code></span><a class="self-link" href="#event-animationevent"></a></h3>


8000
   <p>The <em>additional</em> types of animation events that can occur are:</p>


   <dl>

    <dt><dfn class="idl-code" data-dfn-for="animationevent" data-dfn-type="event" data-export="" id="dom-animationevent-animationcancel">animationcancel<a class="self-link" href="#dom-animationevent-animationcancel"></a></dfn>

    <dd>
			The <a data-link-type="idl" href="#dom-animationevent-animationcancel">animationcancel</a> event occurs when the animation stops running in a way that does not fire an <a data-link-type="idl" href="http://dev.w3.org/csswg/css-animations-1/#dom-animationevent-animationend">animationend</a> event, such as a change in the <a class="property" data-link-type="propdesc" href="http://dev.w3.org/csswg/css-animations-1/#propdef-animation-name">animation-name</a> that removes the animation, or the animating element or one of its ancestors becoming <span class="css">display:none</span>.

     <ul>

      <li>Bubbles: Yes


      <li>Cancelable: No


      <li>Context Info: animationName, elapsedTime, pseudoElement


     </ul>


   </dl>


</main>

  <h2 class="no-ref no-num heading settled" id="conformance"><span class="content">
Conformance</span><a class="self-link" href="#conformance"></a></h2>


  <h3 class="no-ref heading settled" id="conventions"><span class="content">
Document conventions</span><a class="self-link" href="#conventions"></a></h3>


  <p>Conformance requirements are expressed with a combination of
    descriptive assertions and RFC 2119 terminology. The key words "MUST",
    "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT",
    "RECOMMENDED", "MAY", and "OPTIONAL" in the normative parts of this
    document are to be interpreted as described in RFC 2119.
    However, for readability, these words do not appear in all uppercase
    letters in this specification.

    </p>
  <p>All of the text of this specification is normative except sections
    explicitly marked as non-normative, examples, and notes. <a data-link-type="biblio" href="#biblio-rfc2119">[RFC2119]</a></p>


  <p>Examples in this specification are introduced with the words "for example"
    or are set apart from the normative text with <code>class="example"</code>,
    like this:

    </p>
  <div class="example" id="example-f839f6c8"><a class="self-link" href="#example-f839f6c8"></a>

   <p>This is an example of an informative example.</p>


  </div>


  <p>Informative notes begin with the word "Note" and are set apart from the
    normative text with <code>class="note"</code>, like this:

    </p>
  <p class="note" role="note">Note, this is an informative note.</p>


  <p>Advisements are normative sections styled to evoke special attention and are
    set apart from other normative text with <code>&lt;strong class="advisement"></code>, like
    this:

    <strong class="advisement">
        UAs MUST provide an accessible alternative.
    </strong>

</p>
  <h3 class="no-ref heading settled" id="conformance-classes"><span class="content">
Conformance classes</span><a class="self-link" href="#conformance-classes"></a></h3>


  <p>Conformance to this specification
    is defined for three conformance classes:
    </p>
  <dl>

   <dt>style sheet

   <dd>A <a href="http://www.w3.org/TR/CSS21/conform.html#style-sheet">CSS
            style sheet</a>.

   <dt>renderer

   <dd>A <a href="http://www.w3.org/TR/CSS21/conform.html#user-agent">UA</a>
            that interprets the semantics of a style sheet and renders
            documents that use them.

   <dt>authoring tool

   <dd>A <a href="http://www.w3.org/TR/CSS21/conform.html#user-agent">UA</a>
            that writes a style sheet.

  </dl>


  <p>A style sheet is conformant to this specification
    if all of its statements that use syntax defined in this module are valid
    according to the generic CSS grammar and the individual grammars of each
    feature defined in this module.

    </p>
  <p>A renderer is conformant to this specification
    if, in addition to interpreting the style sheet as defined by the
    appropriate specifications, it supports all the features defined
    by this specification by parsing them correctly
    and rendering the document accordingly. However, the inability of a
    UA to correctly render a document due to limitations of the device
    does not make the UA non-conformant. (For example, a UA is not
    required to render color on a monochrome monitor.)

    </p>
  <p>An authoring tool is conformant to this specification
    if it writes style sheets that are syntactically correct according to the
    generic CSS grammar and the individual grammars of each feature in
    this module, and meet all other conformance requirements of style sheets
    as described in this module.

</p>
  <h3 class="no-ref heading settled" id="partial"><span class="content">
Partial implementations</span><a class="self-link" href="#partial"></a></h3>


  <p>So that authors can exploit the forward-compatible parsing rules to
    assign fallback values, CSS renderers <strong>must</strong>
    treat as invalid (and <a href="http://www.w3.org/TR/CSS21/conform.html#ignore">ignore
    as appropriate</a>) any at-rules, properties, property values, keywords,
    and other syntactic constructs for which they have no usable level of
    support. In particular, user agents <strong>must not</strong> selectively
    ignore unsupported component values and honor supported values in a single
    multi-value property declaration: if any value is considered invalid
    (as unsupported values must be), CSS requires that the entire declaration
    be ignored.</p>


  <h3 class="no-ref heading settled" id="experimental"><span class="content">
Experimental implementations</span><a class="self-link" href="#experimental"></a></h3>


  <p>To avoid clashes with future CSS features, the CSS2.1 specification
    reserves a <a href="http://www.w3.org/TR/CSS21/syndata.html#vendor-keywords">prefixed
    syntax</a> for proprietary and experimental extensions to CSS.

    </p>
  <p>Prior to a specification reaching the Candidate Recommendation stage
    in the W3C process, all implementations of a CSS feature are considered
    experimental. The CSS Working Group recommends that implementations
    use a vendor-prefixed syntax for such features, including those in
    W3C Working Drafts. This avoids incompatibilities with future changes
    in the draft.
    </p>


  <h3 class="no-ref heading settled" id="testing"><span class="content">
Non-experimental implementations</span><a class="self-link" href="#testing"></a></h3>


  <p>Once a specification reaches the Candidate Recommendation stage,
    non-experimental implementations are possible, and implementors should
    release an unprefixed implementation of any CR-level feature they
    can demonstrate to be correctly implemented according to spec.

    </p>
  <p>To establish and maintain the interoperability of CSS across
    implementations, the CSS Working Group requests that non-experimental
    CSS renderers submit an implementation report (and, if necessary, the
    testcases used for that implementation report) to the W3C before
    releasing an unprefixed implementation of any CSS features. Testcases
    submitted to W3C are subject to review and correction by the CSS
    Working Group.

    </p>
  <p>Further information on submitting testcases and implementation reports
    can be found from on the CSS Working Group’s website at
    <a href="http://www.w3.org/Style/CSS/Test/">http://www.w3.org/Style/CSS/Test/</a>.
    Questions should be directed to the
    <a href="http://lists.w3.org/Archives/Public/public-css-testsuite">public-css-testsuite@w3.org</a>
    mailing list.


</p>
  <h2 class="no-num heading settled" id="index"><span class="content">Index</span><a class="self-link" href="#index"></a></h2>
  <h3 class="no-num heading settled" id="index-defined-here"><span class="content">Terms defined by this specification</span><a class="self-link" href="#index-defined-here"></a></h3>
  <ul class="indexlist">
   <li>animationcancel, <a href="#dom-animationevent-animationcancel">2.1</a>
  </ul>
  <h3 class="no-num heading settled" id="index-defined-elsewhere"><span class="content">Terms defined by reference</span><a class="self-link" href="#index-defined-elsewhere"></a></h3>
  <ul class="indexlist">
   <li><a data-link-type="biblio" href="#biblio-css-animations-1">[css-animations-1]</a> defines the following terms:
    <ul>
     <li><a href="http://dev.w3.org/csswg/css-animations-1/#propdef-animation-name">animation-name</a>
     <li><a href="http://dev.w3.org/csswg/css-animations-1/#dom-animationevent-animationend">animationend</a>
    </ul>
  </ul>
  <h2 class="no-num heading settled" id="references"><span class="content">References</span><a class="self-link" href="#references"></a></h2>
  <h3 class="no-num heading settled" id="normative"><span class="content">Normative References</span><a class="self-link" href="#normative"></a></h3>
  <dl>
   <dt id="biblio-css-animations-1"><a class="self-link" href="#biblio-css-animations-1"></a>[CSS-ANIMATIONS-1]
   <dd>CSS Animations Module Level 1 URL: <a href="http://www.w3.org/TR/css3-animations/">http://www.w3.org/TR/css3-animations/</a>
   <dt id="biblio-css3-animations"><a class="self-link" href="#biblio-css3-animations"></a>[CSS3-ANIMATIONS]
   <dd>Dean Jackson; et al. <a href="http://www.w3.org/TR/css3-animations/">CSS Animations</a>. 19 February 2013. WD. URL: <a href="http://www.w3.org/TR/css3-animations/">http://www.w3.org/TR/css3-animations/</a>
   <dt id="biblio-rfc2119"><a class="self-link" href="#biblio-rfc2119"></a>[RFC2119]
   <dd>S. Bradner. <a href="https://tools.ietf.org/html/rfc2119">Key words for use in RFCs to Indicate Requirement Levels</a>. March 1997. Best Current Practice. URL: <a href="https://tools.ietf.org/html/rfc2119">https://tools.ietf.org/html/rfc2119</a>
  </dl></body>
</html>