css3-transitions/Overview.src.html

Thu, 29 Mar 2012 21:45:50 -0700

author
L. David Baron <dbaron@dbaron.org>
date
Thu, 29 Mar 2012 21:45:50 -0700
changeset 5339
d8c135bd7251
parent 5334
0bf8cf5edf4b
child 5369
0ed99ba5e0c4
permissions
-rw-r--r--

Make the new ids better by not starting them with 'the'.

     1 <!DOCTYPE html PUBLIC '-//W3C//DTD HTML 4.01//EN'
     2   'http://www.w3.org/TR/html4/strict.dtd'>
     4 <html lang="en">
     5 <head>
     6   <title>CSS Transitions</title>
     7   <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
     8   <link rel="stylesheet" type="text/css" href="../default.css">
     9   <style type="text/css">
    10     table.animatable-properties {
    11       border-collapse: collapse;
    12     }
    13     table.animatable-properties td {
    14       padding: 0.2em 1em;
    15       border: 1px solid black;
    16     }
    17   </style>
    18   <link rel="stylesheet" type="text/css" href="http://www.w3.org/StyleSheets/TR/W3C-ED.css">
    19 </head>
    21 <body>
    23 <div class="head">
    24 <!--logo-->
    26 <h1>CSS Transitions</h1>
    28 <h2 class="no-num no-toc">[LONGSTATUS] [DATE]</h2>
    29 <dl>
    30   <dt>This version:
    31     <dd>
    32     <a href="[VERSION]">
    33       http://dev.w3.org/csswg/css3-transitions/</a>
    34       <!--http://www.w3.org/TR/[YEAR]/WD-[SHORTNAME]-[CDATE]-->
    35   <dt>Latest version:
    36     <dd><a href="http://www.w3.org/TR/css3-transitions/">
    37       [LATEST]</a>
    38   <dt>Editor's draft:
    39     <dd><a href="http://dev.w3.org/csswg/[SHORTNAME]/">http://dev.w3.org/csswg/[SHORTNAME]/</a>
    40   <dt>Previous version:
    41     <dd><a href="http://www.w3.org/TR/2009/WD-css3-transitions-20091201/">
    42       http://www.w3.org/TR/2009/WD-css3-transitions-20091201/</a>
    43   <dt id="editors-list">Editors:
    44     <dd><a href="mailto:dino@apple.com">Dean Jackson</a> (<a
    45       href="http://www.apple.com/">Apple Inc</a>)
    46     <dd><a href="mailto:hyatt@apple.com">David Hyatt</a> (<a
    47       href="http://www.apple.com/">Apple Inc</a>)
    48     <dd><a href="mailto:cmarrin@apple.com">Chris Marrin</a> (<a
    49       href="http://www.apple.com/">Apple Inc</a>)
    50     <dd class=vcard><a class=fn href="http://dbaron.org/">L. David Baron</a> (<a
    51       class=org href="http://www.mozilla.org/">Mozilla</a>)
    53   <dt>Issues list:
    54     <dd><a href="https://www.w3.org/Bugs/Public/buglist.cgi?query_format=advanced&amp;product=CSS&amp;component=Transitions&amp;resolution=---&amp;cmdtype=doit">in Bugzilla</a>
    56   <dt>Discussion:</dt>
    57     <dd><a href="http://lists.w3.org/Archives/Public/www-style/">www-style@w3.org</a> with subject line &ldquo;<kbd>[[SHORTNAME]] <var>&hellip; message topic &hellip;</var></kbd>&rdquo;
    59   <dt>Test suite:
    60     <dd>none yet
    61 </dl>
    63 <!--copyright-->
    65 <hr title="Separator for header">
    66 </div>
    68 <h2 class="no-num no-toc" id="abstract">Abstract</h2>
    70 <p>CSS Transitions allows property changes in CSS values to occur smoothly
    71   over a specified duration.
    73 <h2 class="no-num no-toc" id="status">Status of this document</h2>
    74 <!--status-->
    76 <p>
    77   The <a href="ChangeLog">list of changes made to this specification</a> is
    78   available.
    79 </p>
    81 <h2 class="no-num no-toc" id="contents">Table of contents</h2>
    82 <!--toc-->
    85 <h2 id="introduction">Introduction</h2>
    87       <p><em>This section is not normative.</em>
    88       <p>
    89         This document introduces new CSS features to enable <em>implicit transitions</em>, which describe how CSS properties can be made to change smoothly from one value to another over a given duration.
    90       </p>
    92 <h2 id="transitions"><a id="transitions-">Transitions</a></h2>
    93       <p>
    94         Normally when the value of a CSS property changes, the rendered result is instantly updated, with the affected elements immediately changing from the old property value to the new property value. This section describes a way to specify transitions using new CSS properties. These properties are used to animate smoothly from the old state to the new state over time.
    95       </p>
    96       <p>
    97         For example, suppose that transitions of one second have been defined on the <code class="property">'left'</code> and
    98         <code class="property">'background-color'</code> properties. The following diagram illustrates the effect of updating those properties on an element, in this case moving it to the right and changing the background from red to blue. This assumes other transition parameters still have their default values.
    99       </p>
   100       <div class="figure">
   101         <img src="transition1.png" alt="">
   102       </div>
   103       <p class="caption">
   104         Transitions of <code class="property">'left'</code> and <code class="property">'background-color'</code>
   105       </p>
   106       <p>
   107         Transitions are a presentational effect. The computed value of a property transitions over time from the old value to the new value. Therefore if a script queries the computed style of a property as it is transitioning, it will see an intermediate value that represents the current animated value of the property.
   108       </p>
   109       <p>
   110         Only animatable CSS properties can be transitioned. See the table at the end of this document for a list 
   111         of properties that are animatable.
   112       </p>
   113       <p>
   114         The transition for a property is defined using a number of new properties. For example:
   115       </p>
   116       <div class="example">
   117         <p style="display:none">
   118           Example(s):
   119         </p>
   120         <pre>
   121   div {
   122     transition-property: opacity;
   123     transition-duration: 2s;
   124   }
   125   </pre>The above example defines a transition on the <code class="property">'opacity'</code> property that, when a new value is assigned to it, will cause a smooth change between the old value and the new value over a period of two seconds.
   126       </div>
   127       <p>
   128         Each of the transition properties accepts a comma-separated list, allowing multiple transitions to be defined, each acting on a different property. In this case, the individual transitions take their parameters from the same index in all the lists. For example:
   129       </p>
   130       <div class="example">
   131         <p style="display:none">
   132           Example(s):
   133         </p>
   134         <pre>
   135   div {
   136     transition-property: opacity, left;
   137     transition-duration: 2s, 4s;
   138   }
   140   </pre>This will cause the <code class="property">'opacity'</code> property to transition over a period of two seconds and the left property to transition over a period of four seconds.
   141       </div>
   143       <p id="list-matching">
   144         In the case where the lists of values in transition properties
   145         do not have the same length, the length of the
   146         'transition-property' list determines the number of items in
   147         each list examined when starting transitions.  The lists are
   148         matched up from the first value: excess values at the end are
   149         not used.  If one of the other properties doesn't have enough
   150         comma-separated values to match the number of values of
   151         'transition-property', the UA must calculate its used value by
   152         repeating the list of values until there are enough.  This
   153         truncation or repetition does not affect the computed value.
   154         <span class="note">
   155           Note: This is analogous to the behavior of the 'background-*'
   156           properties, with 'background-image' analogous to
   157           'transition-property'.
   158         </span>
   159       </p>
   161       <div class="example">
   162         <p style="display:none">
   163           Example(s):
   164         </p>
   165       <pre>
   166       div {
   167         transition-property: opacity, left, top, width;
   168         transition-duration: 2s, 1s;
   169       }
   170       </pre>The above example defines a transition on the <code class="property">'opacity'</code> property of 2 seconds duration, a
   171       transition on the <code class="property">'left'</code> property of 1
   172       second duration, a transition on the <code class="property">'top'</code> property of 2 seconds duration and a
   173       transition on the <code class="property">'width'</code> property of 1
   174       second duration.
   176       </div>
   178       <!-- ======================================================================================================= -->
   179       <h3 id=transition-property-property><a id=the-transition-property-property->
   180         The <code class="property">'transition-property'</code> Property
   181       </a></h3>
   182       <p>
   183         The <code class="property">'transition-property'</code> property specifies the name of the CSS property to which the transition is applied.
   184       </p>
   185       <div class="issue">
   186         We may ultimately want to support a keypath syntax for this property. A keypath syntax would enable different transitions to be specified for components of a property. For example the blur of a shadow could have a different transition than the color of a shadow.
   187       </div>
   188       <table class="propdef">
   189         <tbody>
   190           <tr>
   191             <td>
   192               <em>Name:</em>
   193             </td>
   194             <td>
   195               <dfn id="transition-property">transition-property</dfn>
   196             </td>
   197           </tr>
   198           <tr>
   199             <td>
   200               <em>Value:</em>
   201             </td>
   202             <td>
   203               none | [ all | &lt;IDENT&gt; ] [ ',' [ all | &lt;IDENT&gt; ] ]*
   204             </td>
   205           </tr>
   206           <tr>
   207             <td>
   208               <em>Initial:</em>
   209             </td>
   210             <td>
   211               all
   212             </td>
   213           </tr>
   214           <tr>
   215             <td>
   216               <em>Applies&nbsp;to:</em>
   217             </td>
   218             <td>
   219               all elements, :before and :after pseudo elements
   220             </td>
   221           </tr>
   222           <tr>
   223             <td>
   224               <em>Inherited:</em>
   225             </td>
   226             <td>
   227               no
   228             </td>
   229           </tr>
   230           <tr>
   231             <td>
   232               <em>Percentages:</em>
   233             </td>
   234             <td>
   235               N/A
   236             </td>
   237           </tr>
   238           <tr>
   239             <td>
   240               <em>Media:</em>
   241             </td>
   242             <td>
   243               visual
   244             </td>
   245           </tr>
   246           <tr>
   247             <td>
   248               <em>Computed value:</em>
   249             </td>
   250             <td>
   251               Same as specified value.
   252             </td>
   253           </tr>
   254         </tbody>
   255       </table>
   257       <p>
   258         A value of 'none' means that no property will transition.
   259         Otherwise, a list of properties to be transitioned, or the
   260         keyword 'all' which indicates that all properties are to be
   261         transitioned, is given.
   262       </p>
   264       <p>
   265         If one of the identifiers listed is not a recognized property
   266         name or is not an animatable property, the implementation must
   267         still start transitions on the animatable properties in the
   268         list using the duration, delay, and timing function at their
   269         respective indices in the lists for 'transition-duration',
   270         'transition-delay', and 'transition-timing-function'.  In other
   271         words, unrecognized or non-animatable properties must be kept in
   272         the list to preserve the matching of indices.
   273       </p>
   274       <p class="issue">
   275         Are 'none', 'inherit', and 'initial' allowed as items in
   276         a list of identifiers (of length greater than one)?
   277       </p>
   278       <p>
   279         For the keyword 'all', or if one of the identifiers listed is a
   280         shorthand property, implementations must start transitions for
   281         any of its longhand sub-properties that are animatable (or, for
   282         'all', all animatable properties), using the duration, delay,
   283         and timing function at the index corresponding to the shorthand.
   284       </p>
   285       <p>
   286         If a property is specified multiple times in the value of
   287         'transition-property' (either on its own, via a shorthand that
   288         contains it, or via the 'all' value), then the transition that
   289         starts uses the duration, delay, and timing function at the
   290         index corresponding to the <em>last</em> item in the value of
   291         'transition-property' that calls for animating that property.
   292       </p>
   293       <p class="note">
   294         Note:  The <code class="property">all</code> value and shorthand
   295         properties work in similar ways, so the <code
   296         class="property">all</code> value is just like a shorthand that
   297         covers all properties.
   298       </p>
   300       <!-- ======================================================================================================= -->
   301       <h3 id=transition-duration-property><a id=the-transition-duration-property->
   302         The <code class="property">'transition-duration'</code> Property
   303       </a></h3>
   304       <p>
   305         The <code class="property">'transition-duration'</code> property defines the length of time that a transition takes.
   306       </p>
   307       <table class="propdef">
   308         <tbody>
   309           <tr>
   310             <td>
   311               <em>Name:</em>
   312             </td>
   313             <td>
   314               <dfn id="transition-duration">transition-duration</dfn>
   315             </td>
   316           </tr>
   317           <tr>
   318             <td>
   319               <em>Value:</em>
   320             </td>
   321             <td>
   322               &lt;time&gt; [, &lt;time&gt;]*
   323             </td>
   324           </tr>
   325           <tr>
   326             <td>
   327               <em>Initial:</em>
   328             </td>
   329             <td>
   330               0s
   331             </td>
   332           </tr>
   333           <tr>
   334             <td>
   335               <em>Applies&nbsp;to:</em>
   336             </td>
   337             <td>
   338               all elements, :before and :after pseudo elements
   339             </td>
   340           </tr>
   341           <tr>
   342             <td>
   343               <em>Inherited:</em>
   344             </td>
   345             <td>
   346               no
   347             </td>
   348           </tr>
   349           <tr>
   350             <td>
   351               <em>Percentages:</em>
   352             </td>
   353             <td>
   354               N/A
   355             </td>
   356           </tr>
   357           <tr>
   358             <td>
   359               <em>Media:</em>
   360             </td>
   361             <td>
   362               interactive
   363             </td>
   364           </tr>
   365           <tr>
   366             <td>
   367               <em>Computed value:</em>
   368             </td>
   369             <td>
   370               Same as specified value.
   371             </td>
   372           </tr>
   373         </tbody>
   374       </table>
   375       <p>
   376         This property specifies how long the transition from the old value to the new value should take. By default the value is '0s', meaning that the transition is immediate (i.e. there will be no animation). A negative value for <code class="property">transition-duration</code> is treated as '0s'.
   377       </p>
   379       <!-- =======================================================================================================   
   380         -->
   382       <h3 id=transition-timing-function-property><a id=transition-timing-function_tag>
   383         The <code class="property">'transition-timing-function'</code> Property
   384       </a></h3>
   385       <p>
   386         The <code class="property">'transition-timing-function'</code> property
   387         describes how the intermediate values used during a transition will be
   388         calculated. It allows for a transition to change speed over its
   389         duration. These effects are commonly called <em>easing</em> functions.
   390         In either case, a mathematical function that provides a smooth curve is
   391         used.
   392       </p>
   393       <p>
   394         Timing functions are either defined as a stepping function or 
   395         a <a
   396         href="http://en.wikipedia.org/wiki/B%C3%A9zier_curve#Cubic_B.C3.A9zier_curves">cubic
   397         B&eacute;zier curve</a>. 
   398         The timing function takes as its input the current elapsed percentage of
   399         the transition duration and outputs a percentage that determines how
   400         close the transition is to its goal state.
   401       </p>
   402       <p>
   403         A <a href="http://en.wikipedia.org/wiki/Step_function">stepping</a>
   404         function is defined by a number that divides the domain of operation
   405         into equally sized intervals. Each subsequent interval is a equal step
   406         closer to the goal state. The function also specifies whether the
   407         change in output percentage happens at the start or end of the
   408         interval (in other words, if 0% on the input percentage is the point
   409         of initial change).
   410       </p>
   411       <div class="figure">
   412         <img src="step.png" alt="The step timing function splits
   413           the function domain into a number of disjoint straight line
   414           segments. steps(1, start) is a function whose
   415           output value is 1 for all input values. steps(1, end) is a function whose
   416           output value is 0 for all input values less than 1, and output
   417           is 1 for the input value of 1. steps(3, start) is a function that
   418           divides the input domain into three segments, each 1/3 in length,
   419           and 1/3 above the previous segment, with the first segment starting
   420           at 1/3. steps(3, end) is a function that
   421           divides the input domain into three segments, each 1/3 in length,
   422           and 1/3 above the previous segment, with the first segment starting
   423           at 0.">
   424       </div>
   425       <p class="caption">
   426         Step timing functions
   427       </p>
   428       <p>
   429         A <a
   430         href="http://en.wikipedia.org/wiki/B%C3%A9zier_curve#Cubic_B.C3.A9zier_curves">cubic
   431         B&eacute;zier curve</a> is defined by four control points, P<sub>0</sub>
   432         through P<sub>3</sub> (see Figure 1). P<sub>0</sub> and P<sub>3</sub>
   433         are always set to (0,0) and (1,1). The <code class="property">'transition-timing-function'</code> property is used
   434         to specify the values for points P<sub>1</sub> and P<sub>2</sub>. These
   435         can be set to preset values using the keywords listed below, or can be
   436         set to specific values using the <code class="css">'cubic-bezier'</code> function.
   437         In the <code class="css">'cubic-bezier'</code> function, P<sub>1</sub> and
   438         P<sub>2</sub> are each specified by both an X and Y value.
   439       </p>
   440       <div class="figure">
   441         <img src="TimingFunction.png" alt="The B&eacute;zier timing function is a
   442           smooth curve from point P0 = (0,0) to point P3 = (1,1). The
   443           length and orientation of the line segment P0-P1 determines
   444           the tangent and the curvature of the curve at P0 and the
   445           line segment P2-P3 does the same at P3.">
   446       </div>
   447       <p class="caption">
   448         B&eacute;zier Timing Function Control Points
   449       </p>
   450       <table class="propdef">
   451         <tbody>
   452           <tr>
   453             <td>
   454               <em>Name:</em>
   455             </td>
   456             <td>
   457               <dfn id="transition-timing-function">transition-timing-function</dfn>
   458             </td>
   459           </tr>
   460           <tr>
   461             <td>
   462               <em>Value:</em>
   463             </td>
   464             <td>
   465               [ ease | linear | ease-in | ease-out | ease-in-out | step-start | step-end | steps(&lt;integer&gt;[, [ start | end ] ]?) | cubic-bezier(&lt;number&gt;, &lt;number&gt;, &lt;number&gt;, &lt;number&gt;) ] [, [ ease | linear | ease-in | ease-out | ease-in-out | step-start | step-end | steps(&lt;number&gt;[, [ start | end ] ]?) | cubic-bezier(&lt;number&gt;, &lt;number&gt;, &lt;number&gt;, &lt;number&gt;) ] ]*
   466             </td>
   467           </tr>
   468           <tr>
   469             <td>
   470               <em>Initial:</em>
   471             </td>
   472             <td>
   473               ease
   474             </td>
   475           </tr>
   476           <tr>
   477             <td>
   478               <em>Applies&nbsp;to:</em>
   479             </td>
   480             <td>
   481               all elements, :before and :after pseudo elements
   482             </td>
   483           </tr>
   484           <tr>
   485             <td>
   486               <em>Inherited:</em>
   487             </td>
   488             <td>
   489               no
   490             </td>
   491           </tr>
   492           <tr>
   493             <td>
   494               <em>Percentages:</em>
   495             </td>
   496             <td>
   497               N/A
   498             </td>
   499           </tr>
   500           <tr>
   501             <td>
   502               <em>Media:</em>
   503             </td>
   504             <td>
   505               interactive
   506             </td>
   507           </tr>
   508           <tr>
   509             <td>
   510               <em>Computed value:</em>
   511             </td>
   512             <td>
   513               Same as specified value.
   514             </td>
   515           </tr>
   516         </tbody>
   517       </table>
   518       <p>
   519         The timing functions have the following definitions.
   520       </p>
   521       <dl>
   522         <dt>
   523           ease
   524         </dt>
   525         <dd>
   526           The ease function is equivalent to cubic-bezier(0.25, 0.1, 0.25, 1.0).
   527         </dd>
   528         <dt>
   529           linear
   530         </dt>
   531         <dd>
   532           The linear function is equivalent to cubic-bezier(0.0, 0.0, 1.0, 1.0).
   533         </dd>
   534         <dt>
   535           ease-in
   536         </dt>
   537         <dd>
   538           The ease-in function is equivalent to cubic-bezier(0.42, 0, 1.0, 1.0).
   539         </dd>
   540         <dt>
   541           ease-out
   542         </dt>
   543         <dd>
   544           The ease-out function is equivalent to cubic-bezier(0, 0, 0.58, 1.0).
   545         </dd>
   546         <dt>
   547           ease-in-out
   548         </dt>
   549         <dd>
   550           The ease-in-out function is equivalent to cubic-bezier(0.42, 0, 0.58, 1.0)
   551         </dd>
   552         <dt>
   553           step-start
   554         </dt>
   555         <dd>
   556           The step-start function is equivalent to steps(1, start).
   557         </dd>
   558         <dt>
   559           step-end
   560         </dt>
   561         <dd>
   562           The step-end function is equivalent to steps(1, end).
   563         </dd>
   564         <dt>
   565           steps
   566         </dt>
   567         <dd>
   568           Specifies a stepping function, described above, taking two
   569           parameters. The first parameter specifies the number of intervals
   570           in the function. It must be a positive integer (greater than 0).
   571           The second parameter, which is optional, is
   572           either the value 'start' or 'end', and specifies the point
   573           at which the change of values occur within the interval.
   574           If the second parameter is omitted, it is given the value 'end'.
   575         </dd>
   576         <dt>
   577           cubic-bezier
   578         </dt>
   579         <dd>
   580           Specifies a <a
   581           href="http://en.wikipedia.org/wiki/B%C3%A9zier_curve">cubic-bezier
   582           curve</a>. The four values specify points P<sub>1</sub> and
   583           P<sub>2</sub> of the curve as (x1, y1, x2, y2). Both x values must be
   584           in the range [0, 1] or the definition is invalid. The y values can
   585           exceed this range.
   586         </dd>
   587       </dl><!-- ======================================================================================================= -->
   588       <h3 id=transition-delay-property><a id=the-transition-delay-property->
   589         The <code class="property">'transition-delay'</code> Property
   590       </a></h3>
   591       <p>
   592         The <code class="property">'transition-delay'</code> property defines when the transition will start. It allows a transition to begin execution some some period of time from when it is applied. A <code class="property">'transition-delay'</code> value of '0s' means the transition will execute as soon as the property is changed. Otherwise, the value specifies an offset from the moment the property is changed, and the transition will delay execution by that offset.
   593       </p>
   594       <p>
   595         If the value for <code class="property">'transition-delay'</code> is a negative time offset then the transition will execute the moment the property is changed, but will appear to have begun execution at the specified offset. That is, the transition will appear to begin part-way through its play cycle. In the case where a transition has implied starting values and a negative <code class="property">'transition-delay'</code>, the starting values are taken from the moment the property is changed.
   596       </p>
   597       <table class="propdef">
   598         <tbody>
   599           <tr>
   600             <td>
   601               <em>Name:</em>
   602             </td>
   603             <td>
   604               <dfn id="transition-delay">transition-delay</dfn>
   605             </td>
   606           </tr>
   607           <tr>
   608             <td>
   609               <em>Value:</em>
   610             </td>
   611             <td>
   612               &lt;time&gt; [, &lt;time&gt;]*
   613             </td>
   614           </tr>
   615           <tr>
   616             <td>
   617               <em>Initial:</em>
   618             </td>
   619             <td>
   620               0s
   621             </td>
   622           </tr>
   623           <tr>
   624             <td>
   625               <em>Applies&nbsp;to:</em>
   626             </td>
   627             <td>
   628               all elements, :before and :after pseudo elements
   629             </td>
   630           </tr>
   631           <tr>
   632             <td>
   633               <em>Inherited:</em>
   634             </td>
   635             <td>
   636               no
   637             </td>
   638           </tr>
   639           <tr>
   640             <td>
   641               <em>Percentages:</em>
   642             </td>
   643             <td>
   644               N/A
   645             </td>
   646           </tr>
   647           <tr>
   648             <td>
   649               <em>Media:</em>
   650             </td>
   651             <td>
   652               interactive
   653             </td>
   654           </tr>
   655           <tr>
   656             <td>
   657               <em>Computed value:</em>
   658             </td>
   659             <td>
   660               Same as specified value.
   661             </td>
   662           </tr>
   663         </tbody>
   664       </table><!-- ======================================================================================================= -->
   665       <h3 id=transition-shorthand-property><a id=the-transition-shorthand-property->
   666         The <code class="property">'transition'</code> Shorthand Property
   667       </a></h3>
   668       <p>
   669         The <code class="property">'transition'</code> shorthand property combines the four properties described above into a single property.
   670       </p>
   671       <p>
   672         Note that order is important in this property. The first value that can be
   673         parsed as a time is assigned to the transition-duration. The second value that
   674         can be parsed as a time is assigned to transition-delay.
   675       </p>
   676       <p class="issue">
   677         An alternative proposal is to accept the font shorthand approach of
   678         using a "/" character between the values of the same type. e.g. 2s/4s would
   679         mean a duration of 2 seconds and a delay of 4 seconds.
   680       </p>
   681       <table class="propdef">
   682         <tbody>
   683           <tr>
   684             <td>
   685               <em>Name:</em>
   686             </td>
   687             <td>
   688               <dfn id="transition">transition</dfn>
   689             </td>
   690           </tr>
   691           <tr>
   692             <td>
   693               <em>Value:</em>
   694             </td>
   695             <td>
   696               [&lt;'transition-property'&gt; || &lt;'transition-duration'&gt; || &lt;'transition-timing-function'&gt; || &lt;'transition-delay'&gt; [, [&lt;'transition-property'&gt; || &lt;'transition-duration'&gt; || &lt;'transition-timing-function'&gt; || &lt;'transition-delay'&gt;]]*
   697             </td>
   698           </tr>
   699           <tr>
   700             <td>
   701               <em>Initial:</em>
   702             </td>
   703             <td>
   704               see individual properties
   705             </td>
   706           </tr>
   707           <tr>
   708             <td>
   709               <em>Applies&nbsp;to:</em>
   710             </td>
   711             <td>
   712               all elements, :before and :after pseudo elements
   713             </td>
   714           </tr>
   715           <tr>
   716             <td>
   717               <em>Inherited:</em>
   718             </td>
   719             <td>
   720               no
   721             </td>
   722           </tr>
   723           <tr>
   724             <td>
   725               <em>Percentages:</em>
   726             </td>
   727             <td>
   728               N/A
   729             </td>
   730           </tr>
   731           <tr>
   732             <td>
   733               <em>Media:</em>
   734             </td>
   735             <td>
   736               interactive
   737             </td>
   738           </tr>
   739           <tr>
   740             <td>
   741               <em>Computed value:</em>
   742             </td>
   743             <td>
   744               Same as specified value.
   745             </td>
   746           </tr>
   747         </tbody>
   748       </table>
   750       <h2 id="starting">
   751         Starting of transitions
   752       </h2>
   754       <p>
   755         When the computed value of an animatable property changes,
   756         implementations must decide what transitions to start based on
   757         the values of the 'transition-property', 'transition-duration',
   758         'transition-timing-function', and 'transition-delay' properties
   759         at the time the animatable property would first have its new
   760         computed value.
   761       </p>
   762       <div class="example" id="manual-reversing-example">
   763         <p style="display:none">
   764           Example(s):
   765         </p>
   766         <p>This provides a way for authors to specify different values
   767         of the 'transition-*' properties for the &ldquo;forward&rdquo;
   768         and &ldquo;reverse&rdquo; transitions (but see <a
   769         href="#reversing">below</a> for special reversing behavior when
   770         an <em>incomplete</em> transition is interrupted).  Authors can
   771         specify the value of 'transition-duration',
   772         'transition-timing-function', or 'transition-delay' in the same
   773         rule where they specify the value that triggers the transition,
   774         or can change these properties at the same time as they change
   775         the property that triggers the transition.  Since it's the new
   776         values of these 'transition-*' properties that affect the
   777         transition, these values will be used for the transitions
   778         <em>to</em> the associated transitioning values.  For example:
   779          </p>
   780         <pre>li {
   781   transition: background-color linear 1s;
   782   background: blue;
   783 }
   784 li:hover {
   785   background-color: green;
   786   transition-duration: 2s; /* applies to the transition *to* the :hover state */
   787 }</pre>
   788         <p>
   789           When a list item with these style rules enters the :hover
   790           state, the computed 'transition-duration' at the time that
   791           'background-color' would have its new value ('green') is '2s',
   792           so the transition from 'blue' to 'green' takes 2 seconds.
   793           However, when the list item leaves the :hover state, the
   794           transition from 'green' to 'blue' takes 1 second.
   795         </p>
   796       </div>
   798       <p>
   799         When the computed value of a property changes, implementations
   800         must start transitions based on the relevant item (see <a
   801         href="#transition-property">the definition of
   802         'transition-property'</a>) in the computed value of
   803         'transition-property'.  Corresponding to this item there are
   804         values of 'transition-duration' and 'transition-delay' (see <a
   805         href="#list-matching">the rules on matching lists</a>).  Define
   806         the <dfn>combined duration</dfn> of the transition as the sum of
   807         max('transition-duration', '0s') and 'transition-delay'.  When
   808         the combined duration is greater than '0s', then a transition
   809         starts based on the values of 'transition-duration',
   810         'transition-delay', and 'transition-timing-function'; in other
   811         cases transitions do not occur.
   812       </p>
   814       <p>
   815         Since this specification does not define
   816         when computed values change, and thus what changes to
   817         computed values are considered simultaneous,
   818         authors should be aware that changing any of the transition
   819         properties a small amount of time after making a change that
   820         might transition can result in behavior that varies between
   821         implementations, since the changes might be considered
   822         simultaneous in some implementations but not others.
   823       </p>
   824       <p class="note">Say something about simultaneity</p>
   826       <p>
   827         Once the transition of a property has started, it must continue
   828         running based on the original timing function, duration, and
   829         delay, even if the 'transition-timing-function',
   830         'transition-duration', or 'transition-delay' property changes
   831         before the transition is complete.  However, if the
   832         'transition-property' property changes such that the transition
   833         would not have started, the transition must stop (and the
   834         property must immediately change to its final value).
   835       </p>
   837       <p>
   838         Implementations must not start a transition when the computed
   839         value of a property changes as a result of declarative animation
   840         (as opposed to scripted animation).
   841       </p>
   843       <p>
   844         Implementations also must not start a transition when the
   845         computed value changes because it is inherited (directly or
   846         indirectly) from another element that is transitioning the same
   847         property.
   848       </p>
   850       <h2 id="reversing">
   851         Automatically reversing interrupted transitions
   852       </h2>
   853       <p>
   854         A common type of transition effect is when a running transition is
   855         interrupted and the property is reset to its original value. An
   856         example is a hover effect on an element, where the pointer enters and
   857         exits the element before the effect has completed. If the outgoing and
   858         incoming transitions are executed using their specified durations and
   859         timing functions, the resulting effect can be distractingly
   860         asymmetric. Instead, the expected behavior is that the new transition
   861         should be the reverse of what has already executed.
   862       </p>
   864       <p>
   865         If a running transition with duration T, executing so far for duration TE, 
   866         from state A, to state B, is interrupted by
   867         a property change that would start a new transition back to state A, and
   868         all the transition attributes are the same (duration, delay and timing function),
   869         then the new transition must reverse the effect. The new transition must:
   870       </p>
   872       <ol>
   873         <li>
   874           Use the B and A states as its "from" and "to" states respectively. It
   875           does not use the current value as its from state, due to the rules below.
   876         </li>
   877         <li>
   878           Execute with the same duration T, but starting as if the transition had
   879           already begun, without any transition delay, at the moment which would
   880           cause the new transition to finish in TE from the moment of interruption. In other
   881           words, the new transition will execute as if it started T-TE in the past.
   882         </li>
   883         <li>
   884           Use a timing function that is the portion of the curve traversed up
   885           to the moment of interruption, followed in the opposite direction (towards
   886           the starting point). This will make the transition appear as if it 
   887           is playing backwards.
   888         </li>
   889         <li>
   890           Ignore any transition delay.
   891         </li>
   892       </ol>
   894       <p>
   895         For example, suppose there is a transition with a duration of two
   896         seconds. If this transition is interrupted after 0.5 seconds and the
   897         property value assigned to the original value, then the new transition
   898         effect will be the reverse of the original, as if it had begun
   899         1.5 seconds in the past.
   900       </p>
   902       <p>
   903         Note that by using the defined from and to states for the reversing
   904         transition, it is also possible that it may reverse again, if
   905         interrupted; for example, if the transition reversing to state A was
   906         again interrupted by a property change to state B.
   907       </p>
   909       <p class="issue">Issue:
   910         This introduces the concept of reversing a timing function,
   911         which the spec has otherwise resisted doing, and also introduces
   912         a discontinuity between transitions that have
   913         almost completed (which get automatically reversed and thus have
   914         their timing function reversed) and transitions that have fully
   915         completed (where the reversal doesn't lead to the timing
   916         function being reversed).  An alternative proposal that avoids
   917         this is to follow the normal timing function algorithm, except
   918         multiply the duration (and also shorten any negative delay) by
   919         the (output) value of the transition timing function of the
   920         incomplete transition at the time it was interrupted, and, to
   921         account for multiple reverses in sequence, to divide by the
   922         shortening applied to the transition being interrupted.  For
   923         more details see this thread:
   924         <a href="http://lists.w3.org/Archives/Public/www-style/2009Nov/thread.html#msg302">November 2009 part</a>,
   925         <a href="http://lists.w3.org/Archives/Public/www-style/2009Dec/thread.html#msg319">December 2009 part</a>,
   926         <a href="http://lists.w3.org/Archives/Public/www-style/2010Jan/thread.html#msg136">January 2010 part</a>.
   927       </p>
   929       <h2 id=transition-events><a id=transition-events->
   930         Transition Events
   931       </a></h2>
   932       <p>
   933         The completion of a CSS Transition generates a corresponding <a href="http://www.w3.org/TR/DOM-Level-2-Events/events.html">DOM Event</a>.
   934         An event is fired for each property that undergoes a transition.
   935         This allows a content developer to perform actions that synchronize
   936         with the completion of a transition.
   937       </p>
   938       <p>
   939         Each event provides the name of the property the transition is
   940         associated with as well as the duration of the transition.
   941       </p>
   942       <dl>
   943         <dt>
   944           <b>Interface <i><a id="Events-TransitionEvent" name='Events-TransitionEvent'>TransitionEvent</a></i></b>
   945         </dt>
   946         <dd>
   947           <p>
   948             The <code>TransitionEvent</code> interface provides specific contextual information associated with transitions.
   949           </p>
   950           <dl>
   951             <dt>
   952               <b>IDL Definition</b>
   953             </dt>
   954             <dd>
   955               <div class='idl-code'>
   956                 <pre>
   957   interface TransitionEvent : Event {
   958     readonly attribute DOMString          propertyName;
   959     readonly attribute float              elapsedTime;
   960     readonly attribute DOMString          pseudoElement;
   961     void               initTransitionEvent(in DOMString typeArg, 
   962                                           in boolean canBubbleArg, 
   963                                           in boolean cancelableArg, 
   964                                           in DOMString propertyNameArg,
   965                                           in float elapsedTimeArg,
   966                                           in DOMString pseudoElementArg);
   967   };
   968   </pre>
   969               </div>
   970             </dd>
   971             <dt>
   972               <b>Attributes</b>
   973             </dt>
   974             <dd>
   975               <dl>
   976                 <dt>
   977                   <code class='attribute-name'><a id="Events-TransitionEvent-propertyName" name='Events-TransitionEvent-propertyName'>propertyName</a></code> of type <code>DOMString</code>, readonly
   978                 </dt>
   979                 <dd>
   980                   The name of the CSS property associated with the transition.
   981                 </dd>
   982               </dl>
   983               <dl>
   984                 <dt>
   985                   <code class='attribute-name'><a id="Events-TransitionEvent-elapsedTime" name='Events-TransitionEvent-elapsedTime'>elapsedTime</a></code> of type <code>float</code>, readonly
   986                 </dt>
   987                 <dd>
   988                   The amount of time the transition has been running, in seconds, when this event fired. Note that this value is not affected by the value of <code class="property">transition-delay</code>.
   989                 </dd>
   990               </dl>
   991               <dl>
   992                 <dt>
   993                   <code class='attribute-name'><a id="Events-TransitionEvent-pseudoElement" name='Events-TransitionEvent-pseudoElement'>pseudoElement</a></code> of type <code>DOMString</code>, readonly
   994                 </dt>
   995                 <dd>
   996                   The name (beginning with two colons) of the CSS
   997                   pseudo-element on which the transition occured (in
   998                   which case the target of the event is that
   999                   pseudo-element's corresponding element), or the empty
  1000                   string if the transition occurred on an element (which
  1001                   means the target of the event is that element).
  1002                 </dd>
  1003               </dl>
  1004             </dd>
  1005             <dt>
  1006               <b>Methods</b>
  1007             </dt>
  1008             <dd>
  1009               <dl>
  1010                 <dt>
  1011                   <code class='method-name'><a id="Events-TransitionEvent-initTransitionEvent" name='Events-TransitionEvent-initTransitionEvent'>initTransitionEvent</a></code>
  1012                 </dt>
  1013                 <dd>
  1014                   <div class='method'>
  1015                     The <code>initTransitionEvent</code> method is used to
  1016                     initialize the value of a <code>TransitionEvent</code>
  1017                     created through the <a
  1018                     href='http://www.w3.org/TR/DOM-Level-2-Events/events.html#Events-DocumentEvent'><code>DocumentEvent</code></a>
  1019                     interface. This method may only be called before the
  1020                     <code>TransitionEvent</code> has been dispatched via the
  1021                     <code>dispatchEvent</code> method, though it may be called
  1022                     multiple times during that phase if necessary. If called
  1023                     multiple times, the final invocation takes precedence.
  1024                     <p class="issue">Should new events being created still
  1025                     have init*Event methods?</p>
  1026                     <div class='parameters'>
  1027                       <b>Parameters</b>
  1028                       <div class='paramtable'>
  1029                         <dl>
  1030                           <dt>
  1031                             <code class='parameter-name'>typeArg</code> of type <code>DOMString</code>
  1032                           </dt>
  1033                           <dd>
  1034                             Specifies the event type.<br>
  1035                           </dd>
  1036                           <dt>
  1037                             <code class='parameter-name'>canBubbleArg</code> of type <code>boolean</code>
  1038                           </dt>
  1039                           <dd>
  1040                             Specifies whether or not the event can bubble.<br>
  1041                           </dd>
  1042                           <dt>
  1043                             <code class='parameter-name'>cancelableArg</code> of type <code>boolean</code>
  1044                           </dt>
  1045                           <dd>
  1046                             Specifies whether or not the event's default action can be prevented. Since a TransitionEvent
  1047                             is purely for notification, there is no default action.<br>
  1048                           </dd>
  1049                           <dt>
  1050                             <code class='parameter-name'>propertyNameArg</code> of type <code>DOMString</code>
  1051                           </dt>
  1052                           <dd>
  1053                             Specifies the name of the property associated with the <a href='http://www.w3.org/TR/DOM-Level-2-Events/events.html#Events-Event'><code>Event</code></a>.
  1054                             (See the <a href="#Events-TransitionEvent-propertyName">propertyName</a> attribute.)
  1055                           </dd>
  1056                           <dt>
  1057                             <code class='parameter-name'>elapsedTimeArg</code> of type <code>float</code>
  1058                           </dt>
  1059                           <dd>
  1060                             Specifies the amount of time, in seconds, the transition has been running at the time of initialization.
  1061                             (See the <a href="#Events-TransitionEvent-elapsedTime">elapsedTime</a> attribute.)
  1062                           </dd>
  1063                           <dt>
  1064                             <code class='parameter-name'>pseudoElementArg</code> of type <code>DOMString</code>
  1065                           </dt>
  1066                           <dd>
  1067                             Specifies the pseudo-element on which the
  1068                             transition occurred.
  1069                             (See the <a href="#Events-TransitionEvent-pseudoElement">pseudoElement</a> attribute.)
  1070                             <span class="issue">Does adding this additional argument create any compatibility problems?</span>
  1071                           </dd>
  1072                         </dl>
  1073                       </div>
  1074                     </div><!-- parameters -->
  1075                     <div>
  1076                       <b>No Return Value</b>
  1077                     </div>
  1078                     <div>
  1079                       <b>No Exceptions</b>
  1080                     </div>
  1081                   </div><!-- method -->
  1082                 </dd>
  1083               </dl>
  1084             </dd>
  1085           </dl>
  1086         </dd>
  1087       </dl>
  1088       <p>
  1089         There is one type of transition event available.
  1090       </p>
  1091       <dl>
  1092         <dt>
  1093           <b>transitionend</b>
  1094         </dt>
  1095         <dd>
  1096           The 'transitionend' event occurs at the completion of the transition. In the
  1097           case where a transition is removed before completion, such as if the
  1098           transition-property is removed, then the event will not fire.
  1099           <ul>
  1100             <li>Bubbles: Yes
  1101             </li>
  1102             <li>Cancelable: Yes
  1103             </li>
  1104             <li>Context Info: propertyName, elapsedTime
  1105             </li>
  1106           </ul>
  1107         </dd>
  1108       </dl>
  1110       <h2 id="animatable-types"><a id=animation-of-property-types->
  1111         Animation of property types
  1112       </a></h2>
  1114       <p>
  1115         The following describes how each property type undergoes transition or
  1116         animation.
  1117       </p>
  1119       <ul>
  1120         <li>
  1121           <strong>color</strong>: interpolated via red, green, blue and alpha
  1122           components (treating each as a number, see below).
  1123           <div class="issue">Issue: Are the colors interpolated in
  1124           premultiplied space or non-premultiplied space?</div>
  1125         </li>
  1126         <li>
  1127           <strong>length</strong>: interpolated as real numbers.
  1128         </li>
  1129         <li>
  1130           <strong>percentage</strong>: interpolated as real numbers.
  1131         </li>
  1132         <li>
  1133           <strong>integer</strong>: interpolated via discrete steps (whole
  1134           numbers). The interpolation happens in real number space and is
  1135           converted to an integer using <code>floor()</code>.
  1136           <span class="issue">
  1137             This floor behavior is inconsistent with SMIL Animation /
  1138             SVG Animation.
  1139           </span>
  1140         </li>
  1141         <li>
  1142           <strong>font weight</strong>: interpolated via discrete steps
  1143           (multiples of 100). The interpolation happens in real number
  1144           space and is converted to an integer by rounding to the
  1145           nearest multiple of 100.
  1146           <span class="issue">
  1147             This round-to-nearest behavior is inconsistent with the
  1148             floor behavior used for integer types, but probably should
  1149             be consistent (one way or the other).
  1150           </span>
  1151         </li>
  1152         <li>
  1153           <strong>number</strong>: interpolated as real (floating point)
  1154           numbers.
  1155         </li>
  1156         <li>
  1157           <strong>transform list</strong>: see 
  1158             CSS Transforms specification [[!CSS3-TRANSFORMS]].
  1159         </li>
  1160         <li>
  1161           <strong>rectangle</strong>: interpolated via the x, y,
  1162           width and height components (treating each as a number).
  1163         </li>
  1164         <li>
  1165           <strong>visibility</strong>: if one of the values is
  1166           'visible', interpolated as a discrete step where values of the
  1167           timing function between 0 and 1 map to 'visible' and other
  1168           values of the timing function (which occur only at the
  1169           start/end of the transition or as a result of 'cubic-bezier()'
  1170           functions with Y values outside of [0, 1]) map to the closer
  1171           endpoint; if neither value is 'visible' then not interpolable.
  1172         </li>
  1173         <li>
  1174           <strong>shadow</strong>: interpolated via the color, x, y
  1175           and blur components (treating them as color and numbers where
  1176           appropriate). In the case where there are lists of shadows,
  1177           the shorter list is padded at the end with shadows whose
  1178           color is transparent and all lengths (x, y, blur) are 0.
  1179         </li>
  1180         <li>
  1181           <strong>gradient</strong>: interpolated via the
  1182           positions and colors of each stop. They must have the same type
  1183           (radial or linear) and same number of stops in order to be animated.
  1184           <span class="note">Note: [[CSS3-IMAGES]] may extend this
  1185           definition.</span>
  1186         </li>
  1187         <li>
  1188           <strong>paint server</strong> (SVG): interpolation is only supported
  1189           between: gradient to gradient and color to color. They then
  1190           work as above.
  1191         </li>
  1192         <li>
  1193           <strong>list of above types</strong>: If the lists have the
  1194           same number of items, each item in the list is interpolated using the
  1195           rules above. Otherwise the interpolation is determined by the property
  1196           rules. If the property extends its list by repeating values, then this
  1197           repeated form will be used in the interpolation (<code class="property">'background-position'</code>
  1198           is an example of a property that would transition between lists of different lengths). If
  1199           the property does not allow extending its list, then no interpolation
  1200           will occur.
  1201         </li>
  1202         <li>
  1203           <strong>a shorthand property</strong>: If any part of a
  1204           shorthand can be animated, then interpolation is performed as
  1205           if those animatable properties were individually specified.
  1206         </li>
  1207       </ul>
  1209       <p class="issue">Issue:  Need to describe handling of out-of-range
  1210       values that can result from cubic-bezier().  Clamping values to the
  1211       allowed range is probably the best solution.</p>
  1213       <h2 id=animatable-properties><a id=animatable-properties->
  1214         Animatable properties
  1215       </a></h2>
  1217       <!--
  1218       As resolved in
  1219       http://lists.w3.org/Archives/Public/www-style/2011Sep/0497.html
  1220       -->
  1221       <p>For properties that exist at the time this specification was
  1222       developed, this specification defines whether and how they are
  1223       animated.  However, future CSS specifications may define
  1224       additional properties, additional values for existing properties,
  1225       or additional animation behavior of existing values.  In order to
  1226       describe new animation behaviors and to have the definition of
  1227       animation behavior in a more appropriate location, future CSS
  1228       specifications should include an "Animatable:" line in the summary
  1229       of the property's definition (in addition to the other lines
  1230       described in [[CSS21]], <a
  1231       href="http://www.w3.org/TR/CSS21/about.html#property-defs">section
  1232       1.4.2</a>).  This line should say "no" to indicate that a property
  1233       cannot be animated or should reference an animation behavior
  1234       (which may be one of the behaviors in the <a
  1235       href="#animation-of-property-types-">Animation of property
  1236       types</a> section above, or may be a new behavior) to define how
  1237       the property animates.  Such definitions override those given in
  1238       this specification.</p>
  1240       <h3 id=animatable-css><a id=properties-from-css->
  1241         Properties from CSS
  1242       </a></h3>
  1244      <table class="animatable-properties">
  1245        <tr>
  1246          <th>Property Name</th>
  1247          <th>Type</th>
  1248        </tr>
  1249        <tr>
  1250          <td>background-color</td><td>color</tr>
  1251        <tr>
  1252          <td>background-position</td><td>percentage, length</td>
  1253        </tr>
  1254        <tr>
  1255          <td>border-bottom-color</td><td>color</td>
  1256        </tr>
  1257        <tr>
  1258          <td>border-bottom-width</td><td>length</td>
  1259        </tr>
  1260        <tr>
  1261          <td>border-left-color</td><td>color</td>
  1262        </tr>
  1263        <tr>
  1264          <td>border-left-width</td><td>length</td>
  1265        </tr>
  1266        <tr>
  1267          <td>border-right-color</td><td>color</td>
  1268        </tr>
  1269        <tr>
  1270          <td>border-right-width</td><td>length</td>
  1271        </tr>
  1272        <tr>
  1273          <td>border-spacing</td><td>length</td>
  1274        </tr>
  1275        <tr>
  1276          <td>border-top-color</td><td>color</td>
  1277        </tr>
  1278        <tr>
  1279          <td>border-top-width</td><td>length</td>
  1280        </tr>
  1281        <tr>
  1282          <td>bottom</td><td>length, percentage</td>
  1283        </tr>
  1284        <tr>
  1285          <td>clip</td><td>rectangle</td>
  1286        </tr>
  1287        <tr>
  1288          <td>color</td><td>color</td>
  1289        </tr>
  1290        <tr>
  1291          <td>crop <span class="issue">css3-content will likely advance slower than this specification, in which case this definition should move there</span></td><td>rectangle</td>
  1292        </tr>
  1293        <tr>
  1294          <td>font-size</td><td>length, percentage</td>
  1295        </tr>
  1296        <tr>
  1297          <td>font-weight</td><td>font weight</td>
  1298        </tr>
  1299        <tr>
  1300          <td>height</td><td>length, percentage</td>
  1301        </tr>
  1302        <tr>
  1303          <td>left</td><td>length, percentage</td>
  1304        </tr>
  1305        <tr>
  1306          <td>letter-spacing</td><td>length</td>
  1307        </tr>
  1308        <tr>
  1309          <td>line-height</td><td>number, length, percentage</td>
  1310        </tr>
  1311        <tr>
  1312          <td>margin-bottom</td><td>length</td>
  1313        </tr>
  1314        <tr>
  1315          <td>margin-left</td><td>length</td>
  1316        </tr>
  1317        <tr>
  1318          <td>margin-right</td><td>length</td>
  1319        </tr>
  1320        <tr>
  1321          <td>margin-top</td><td>length</td>
  1322        </tr>
  1323        <tr>
  1324          <td>max-height</td><td>length, percentage</td>
  1325        </tr>
  1326        <tr>
  1327          <td>max-width</td><td>length, percentage </td>
  1328        </tr>
  1329        <tr>
  1330          <td>min-height</td><td>length, percentage</td>
  1331        </tr>
  1332        <tr>
  1333          <td>min-width</td><td>length, percentage</td>
  1334        </tr>
  1335        <tr>
  1336          <td>opacity</td><td>number</td>
  1337        </tr>
  1338        <tr>
  1339          <td>outline-color</td><td>color</td>
  1340        </tr>
  1341        <tr>
  1342          <td>outline-offset</td><td>integer</td>
  1343        </tr>
  1344        <tr>
  1345          <td>outline-width</td><td>length</td>
  1346        </tr>
  1347        <tr>
  1348          <td>padding-bottom</td><td>length</td>
  1349        </tr>
  1350        <tr>
  1351          <td>padding-left</td><td>length</td>
  1352        </tr>
  1353        <tr>
  1354          <td>padding-right</td><td>length</td>
  1355        </tr>
  1356        <tr>
  1357          <td>padding-top</td><td>length</td>
  1358        </tr>
  1359        <tr>
  1360          <td>right</td><td>length, percentage</td>
  1361        </tr>
  1362        <tr>
  1363          <td>text-indent</td><td>length, percentage</td>
  1364        </tr>
  1365        <tr>
  1366          <td>text-shadow</td><td>shadow</td>
  1367        </tr>
  1368        <tr>
  1369          <td>top</td><td>length, percentage</td>
  1370        </tr>
  1371        <tr>
  1372          <td>vertical-align</td><td>length, percentage</td>
  1373        </tr>
  1374        <tr>
  1375          <td>visibility</td><td>visibility</td>
  1376        </tr>
  1377        <tr>
  1378          <td>width</td><td>length, percentage</td>
  1379        </tr>
  1380        <tr>
  1381          <td>word-spacing</td><td>length, percentage</td>
  1382        </tr>
  1383        <tr>
  1384          <td>z-index</td><td>integer</td>
  1385        </tr>
  1386      </table>
  1388 <p class="issue">
  1389   This list omits the following properties that Gecko can animate, and
  1390   which likely should be included:
  1391   background-size,
  1392   border-*-radius,
  1393   box-shadow,
  1394   column-count,
  1395   column-gap,
  1396   column-rule-color,
  1397   column-rule-width,
  1398   column-width,
  1399   font-size-adjust,
  1400   font-stretch,
  1401   marker-offset,
  1402   text-decoration-color,
  1403   transform,
  1404   transform-origin.
  1405 </p>
  1407      <h3 id=animatable-svg><a id=properties-from-svg->
  1408        Properties from SVG
  1409      </a></h3>
  1411      <p>
  1412        All properties defined as animatable in the SVG specification, provided
  1413        they are one of the property types listed above.
  1414       </p>
  1416      <!-- <table>
  1417        <tr>
  1418          <th>Property Name</th><th>Type</th>
  1419        </tr>
  1420        <tr>
  1421          <td>stop-color</td><td>color</td>
  1422        </tr>
  1423        <tr>
  1424          <td>stop-opacity</td><td>float</td>
  1425        </tr>
  1426        <tr>
  1427          <td>fill</td><td>paint server</td>
  1428        </tr>
  1429        <tr>
  1430          <td>fill-opacity</td><td>float</td>
  1431        </tr>
  1432        <tr>
  1433          <td>stroke</td><td>paint server</td>
  1434        </tr>
  1435        <tr>
  1436          <td>stroke-dasharray</td><td>list of numbers</td>
  1437        </tr>
  1438        <tr>
  1439          <td>stroke-dashoffset</td><td>number</td>
  1440        </tr>
  1441        <tr>
  1442          <td>stroke-miterlimit</td><td>number</td>
  1443        </tr>
  1444        <tr>
  1445          <td>stroke-opacity</td><td>float</td>
  1446        </tr>
  1447        <tr>
  1448          <td>stroke-width</td><td>float</td>
  1449        </tr>
  1450        <tr>
  1451          <td>viewport-fill</td><td>color</td>
  1452        </tr>
  1453        <tr>
  1454          <td>viewport-fill-opacity</td><td>color</td>
  1455        </tr>
  1456       </table> -->
  1458 <h2 id="acknowledgments">Acknowledgments</h2>
  1460 <p>Thanks especially to the feedback from
  1461 Tab Atkins,
  1462 Aryeh Gregor,
  1463 Vincent Hardy,
  1464 Cameron McCormack,
  1465 Alex Mogilevsky,
  1466 and all the rest of the
  1467 <a href="http://lists.w3.org/Archives/Public/www-style/">www-style</a> community.</p>
  1469 <h2 id="references">References</h2>
  1471 <h3 class="no-num" id=normative-references>Normative references</h3>
  1472 <!--normative-->
  1474 <h3 class="no-num" id=other-references>Other references</h3>
  1475 <!--informative-->
  1479 <h2 class="no-num" id=property-index>Property index</h2>
  1480 <!-- properties -->
  1484 <h2 class="no-num" id="index">Index</h2>
  1485 <!--index-->
  1487 </body>
  1488 </html>
  1489 <!-- Keep this comment at the end of the file
  1490 Local variables:
  1491 mode: sgml
  1492 sgml-default-doctype-name:"html"
  1493 sgml-minimize-attributes:t
  1494 End:
  1495 -->

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