css3-transitions/Overview.src.html

Wed, 28 Mar 2012 22:04:08 -0700

author
L. David Baron <dbaron@dbaron.org>
date
Wed, 28 Mar 2012 22:04:08 -0700
changeset 5303
083f80ca0535
parent 5298
07b883120d89
child 5312
f2453d922d28
permissions
-rw-r--r--

Fix two errors in the grammar of the steps() function: first, add necessary [] so that the comma applies to both the start and end values; second, add the ? that was intended to indicate the second parameter being optional.

     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   <link rel="stylesheet" type="text/css" href="../default.css">
     8   <style type="text/css">
     9     table.animatable-properties {
    10       border-collapse: collapse;
    11     }
    12     table.animatable-properties td {
    13       padding: 0.2em 1em;
    14       border: 1px solid black;
    15     }
    16   </style>
    17   <link rel="stylesheet" type="text/css" href="http://www.w3.org/StyleSheets/TR/W3C-ED.css">
    18 </head>
    20 <body>
    22 <div class="head">
    23 <!--logo-->
    25 <h1>CSS Transitions</h1>
    27 <h2 class="no-num no-toc">[LONGSTATUS] [DATE]</h2>
    28 <dl>
    29   <dt>This version:
    30     <dd>
    31     <a href="[VERSION]">
    32       http://dev.w3.org/csswg/css3-transitions/</a>
    33       <!--http://www.w3.org/TR/[YEAR]/WD-[SHORTNAME]-[CDATE]-->
    34   <dt>Latest version:
    35     <dd><a href="http://www.w3.org/TR/css3-transitions">
    36       [LATEST]</a>
    37   <dt>Editor's draft:
    38     <dd><a href="http://dev.w3.org/csswg/[SHORTNAME]/">http://dev.w3.org/csswg/[SHORTNAME]/</a>
    39   <dt>Previous version:
    40     <dd><a href="http://www.w3.org/TR/2009/WD-css3-transitions-20091201/">
    41       http://www.w3.org/TR/2009/WD-css3-transitions-20091201/</a>
    42   <dt id="editors-list">Editors:
    43     <dd><a href="mailto:dino@apple.com">Dean Jackson</a> (<a
    44       href="http://www.apple.com/">Apple Inc</a>)
    45     <dd><a href="mailto:hyatt@apple.com">David Hyatt</a> (<a
    46       href="http://www.apple.com/">Apple Inc</a>)
    47     <dd><a href="mailto:cmarrin@apple.com">Chris Marrin</a> (<a
    48       href="http://www.apple.com/">Apple Inc</a>)
    49     <dd class=vcard><a class=fn href="http://dbaron.org/">L. David Baron</a> (<a
    50       class=org href="http://www.mozilla.com/">Mozilla</a>)
    52   <dt>Issues list:
    53     <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>
    55   <dt>Discussion:</dt>
    56     <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;
    58   <dt>Test suite:
    59     <dd>none yet
    60 </dl>
    62 <!--copyright-->
    64 <hr title="Separator for header">
    65 </div>
    67 <h2 class="no-num no-toc" id="abstract">Abstract</h2>
    69 <p>CSS Transitions allows property changes in CSS values to occur smoothly
    70   over a specified duration.
    72 <h2 class="no-num no-toc" id="status">Status of this document</h2>
    73 <!--status-->
    75 <p>
    76   The <a href="ChangeLog">list of changes made to this specification</a> is
    77   available.
    78 </p>
    80 <h2 class="no-num no-toc" id="contents">Table of contents</h2>
    81 <!--toc-->
    84 <h2 id="introduction">Introduction</h2>
    86       <p><em>This section is not normative.</em>
    87       <p>
    88         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.
    89       </p>
    91 <h2 id="transitions">Transitions</h2>
    92       <p>
    93         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.
    94       </p>
    95       <p>
    96         For example, suppose that transitions of one second have been defined on the <code class="property">'left'</code> and
    97         <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.
    98       </p>
    99       <div class="figure">
   100         <img src="transition1.png" alt="">
   101       </div>
   102       <p class="caption">
   103         Transitions of <code class="property">'left'</code> and <code class="property">'background-color'</code>
   104       </p>
   105       <p>
   106         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.
   107       </p>
   108       <p>
   109         Only animatable CSS properties can be transitioned. See the table at the end of this document for a list 
   110         of properties that are animatable.
   111       </p>
   112       <p>
   113         The transition for a property is defined using a number of new properties. For example:
   114       </p>
   115       <div class="example">
   116         <p style="display:none">
   117           Example(s):
   118         </p>
   119         <pre>
   120   div {
   121     transition-property: opacity;
   122     transition-duration: 2s;
   123   }
   124   </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.
   125       </div>
   126       <p>
   127         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:
   128       </p>
   129       <div class="example">
   130         <p style="display:none">
   131           Example(s):
   132         </p>
   133         <pre>
   134   div {
   135     transition-property: opacity, left;
   136     transition-duration: 2s, 4s;
   137   }
   139   </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.
   140       </div>
   142       <p id="list-matching">
   143         In the case where the lists of values in transition properties
   144         do not have the same length, the length of the
   145         'transition-property' list determines the number of items in
   146         each list examined when starting transitions.  The lists are
   147         matched up from the first value: excess values at the end are
   148         not used.  If one of the other properties doesn't have enough
   149         comma-separated values to match the number of values of
   150         'transition-property', the UA must calculate its used value by
   151         repeating the list of values until there are enough.  This
   152         truncation or repetition does not affect the computed value.
   153         <span class="note">
   154           Note: This is analogous to the behavior of the 'background-*'
   155           properties, with 'background-image' analogous to
   156           'transition-property'.
   157         </span>
   158       </p>
   160       <div class="example">
   161         <p style="display:none">
   162           Example(s):
   163         </p>
   164       <pre>
   165       div {
   166         transition-property: opacity, left, top, width;
   167         transition-duration: 2s, 1s;
   168       }
   169       </pre>The above example defines a transition on the <code class="property">'opacity'</code> property of 2 seconds duration, a
   170       transition on the <code class="property">'left'</code> property of 1
   171       second duration, a transition on the <code class="property">'top'</code> property of 2 seconds duration and a
   172       transition on the <code class="property">'width'</code> property of 1
   173       second duration.
   175       </div>
   177       <!-- ======================================================================================================= -->
   178       <h3>
   179         The <code class="property">'transition-property'</code> Property
   180       </h3>
   181       <p>
   182         The <code class="property">'transition-property'</code> property specifies the name of the CSS property to which the transition is applied.
   183       </p>
   184       <div class="issue">
   185         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.
   186       </div>
   187       <table class="propdef">
   188         <tbody>
   189           <tr>
   190             <td>
   191               <em>Name:</em>
   192             </td>
   193             <td>
   194               <dfn id="transition-property">transition-property</dfn>
   195             </td>
   196           </tr>
   197           <tr>
   198             <td>
   199               <em>Value:</em>
   200             </td>
   201             <td>
   202               none | [ all | &lt;IDENT&gt; ] [ ',' [ all | &lt;IDENT&gt; ] ]*
   203             </td>
   204           </tr>
   205           <tr>
   206             <td>
   207               <em>Initial:</em>
   208             </td>
   209             <td>
   210               all
   211             </td>
   212           </tr>
   213           <tr>
   214             <td>
   215               <em>Applies&nbsp;to:</em>
   216             </td>
   217             <td>
   218               all elements, :before and :after pseudo elements
   219             </td>
   220           </tr>
   221           <tr>
   222             <td>
   223               <em>Inherited:</em>
   224             </td>
   225             <td>
   226               no
   227             </td>
   228           </tr>
   229           <tr>
   230             <td>
   231               <em>Percentages:</em>
   232             </td>
   233             <td>
   234               N/A
   235             </td>
   236           </tr>
   237           <tr>
   238             <td>
   239               <em>Media:</em>
   240             </td>
   241             <td>
   242               visual
   243             </td>
   244           </tr>
   245           <tr>
   246             <td>
   247               <em>Computed value:</em>
   248             </td>
   249             <td>
   250               Same as specified value.
   251             </td>
   252           </tr>
   253         </tbody>
   254       </table>
   256       <p>
   257         A value of 'none' means that no property will transition.
   258         Otherwise, a list of properties to be transitioned, or the
   259         keyword 'all' which indicates that all properties are to be
   260         transitioned, is given.
   261       </p>
   263       <p>
   264         If one of the identifiers listed is not a recognized property
   265         name or is not an animatable property, the implementation must
   266         still start transitions on the animatable properties in the
   267         list using the duration, delay, and timing function at their
   268         respective indices in the lists for 'transition-duration',
   269         'transition-delay', and 'transition-timing-function'.  In other
   270         words, unrecognized or non-animatable properties must be kept in
   271         the list to preserve the matching of indices.
   272       </p>
   273       <p class="issue">
   274         Are 'none', 'inherit', and 'initial' allowed as items in
   275         a list of identifiers (of length greater than one)?
   276       </p>
   277       <p>
   278         For the keyword 'all', or if one of the identifiers listed is a
   279         shorthand property, implementations must start transitions for
   280         any of its longhand sub-properties that are animatable (or, for
   281         'all', all animatable properties), using the duration, delay,
   282         and timing function at the index corresponding to the shorthand.
   283       </p>
   284       <p>
   285         If a property is specified multiple times in the value of
   286         'transition-property' (either on its own, via a shorthand that
   287         contains it, or via the 'all' value), then the transition that
   288         starts uses the duration, delay, and timing function at the
   289         index corresponding to the <em>last</em> item in the value of
   290         'transition-property' that calls for animating that property.
   291       </p>
   292       <p class="note">
   293         Note:  The <code class="property">all</code> value and shorthand
   294         properties work in similar ways, so the <code
   295         class="property">all</code> value is just like a shorthand that
   296         covers all properties.
   297       </p>
   299       <!-- ======================================================================================================= -->
   300       <h3>
   301         The <code class="property">'transition-duration'</code> Property
   302       </h3>
   303       <p>
   304         The <code class="property">'transition-duration'</code> property defines the length of time that a transition takes.
   305       </p>
   306       <table class="propdef">
   307         <tbody>
   308           <tr>
   309             <td>
   310               <em>Name:</em>
   311             </td>
   312             <td>
   313               <dfn id="transition-duration">transition-duration</dfn>
   314             </td>
   315           </tr>
   316           <tr>
   317             <td>
   318               <em>Value:</em>
   319             </td>
   320             <td>
   321               &lt;time&gt; [, &lt;time&gt;]*
   322             </td>
   323           </tr>
   324           <tr>
   325             <td>
   326               <em>Initial:</em>
   327             </td>
   328             <td>
   329               0s
   330             </td>
   331           </tr>
   332           <tr>
   333             <td>
   334               <em>Applies&nbsp;to:</em>
   335             </td>
   336             <td>
   337               all elements, :before and :after pseudo elements
   338             </td>
   339           </tr>
   340           <tr>
   341             <td>
   342               <em>Inherited:</em>
   343             </td>
   344             <td>
   345               no
   346             </td>
   347           </tr>
   348           <tr>
   349             <td>
   350               <em>Percentages:</em>
   351             </td>
   352             <td>
   353               N/A
   354             </td>
   355           </tr>
   356           <tr>
   357             <td>
   358               <em>Media:</em>
   359             </td>
   360             <td>
   361               interactive
   362             </td>
   363           </tr>
   364           <tr>
   365             <td>
   366               <em>Computed value:</em>
   367             </td>
   368             <td>
   369               Same as specified value.
   370             </td>
   371           </tr>
   372         </tbody>
   373       </table>
   374       <p>
   375         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'.
   376       </p>
   378       <!-- =======================================================================================================   
   379         -->
   381       <h3 id="transition-timing-function_tag">
   382         The <code class="property">'transition-timing-function'</code> Property
   383       </h3>
   384       <p>
   385         The <code class="property">'transition-timing-function'</code> property
   386         describes how the intermediate values used during a transition will be
   387         calculated. It allows for a transition to change speed over its
   388         duration. These effects are commonly called <em>easing</em> functions.
   389         In either case, a mathematical function that provides a smooth curve is
   390         used.
   391       </p>
   392       <p>
   393         Timing functions are either defined as a stepping function or 
   394         a <a
   395         href="http://en.wikipedia.org/wiki/B%C3%A9zier_curve#Cubic_B.C3.A9zier_curves">cubic
   396         B&eacute;zier curve</a>. 
   397         The timing function takes as its input the current elapsed percentage of
   398         the transition duration and outputs a percentage that determines how
   399         close the transition is to its goal state.
   400       </p>
   401       <p>
   402         A <a href="http://en.wikipedia.org/wiki/Step_function">stepping</a>
   403         function is defined by a number that divides the domain of operation
   404         into equally sized intervals. Each subsequent interval is a equal step
   405         closer to the goal state. The function also specifies whether the
   406         change in output percentage happens at the start or end of the
   407         interval (in other words, if 0% on the input percentage is the point
   408         of initial change).
   409       </p>
   410       <div class="figure">
   411         <img src="step.png" alt="The step timing function splits
   412           the function domain into a number of disjoint straight line
   413           segments. steps(1, start) is a function whose
   414           output value is 1 for all input values. steps(1, end) is a function whose
   415           output value is 0 for all input values less than 1, and output
   416           is 1 for the input value of 1. steps(3, start) is a function that
   417           divides the input domain into three segments, each 1/3 in length,
   418           and 1/3 above the previous segment, with the first segment starting
   419           at 1/3. steps(3, end) is a function that
   420           divides the input domain into three segments, each 1/3 in length,
   421           and 1/3 above the previous segment, with the first segment starting
   422           at 0.">
   423       </div>
   424       <p class="caption">
   425         Step timing functions
   426       </p>
   427       <p>
   428         A <a
   429         href="http://en.wikipedia.org/wiki/B%C3%A9zier_curve#Cubic_B.C3.A9zier_curves">cubic
   430         B&eacute;zier curve</a> is defined by four control points, P<sub>0</sub>
   431         through P<sub>3</sub> (see Figure 1). P<sub>0</sub> and P<sub>3</sub>
   432         are always set to (0,0) and (1,1). The <code class="property">'transition-timing-function'</code> property is used
   433         to specify the values for points P<sub>1</sub> and P<sub>2</sub>. These
   434         can be set to preset values using the keywords listed below, or can be
   435         set to specific values using the <code class="css">'cubic-bezier'</code> function.
   436         In the <code class="css">'cubic-bezier'</code> function, P<sub>1</sub> and
   437         P<sub>2</sub> are each specified by both an X and Y value.
   438       </p>
   439       <div class="figure">
   440         <img src="TimingFunction.png" alt="The B&eacute;zier timing function is a
   441           smooth curve from point P0 = (0,0) to point P3 = (1,1). The
   442           length and orientation of the line segment P0-P1 determines
   443           the tangent and the curvature of the curve at P0 and the
   444           line segment P2-P3 does the same at P3.">
   445       </div>
   446       <p class="caption">
   447         B&eacute;zier Timing Function Control Points
   448       </p>
   449       <table class="propdef">
   450         <tbody>
   451           <tr>
   452             <td>
   453               <em>Name:</em>
   454             </td>
   455             <td>
   456               <dfn id="transition-timing-function">transition-timing-function</dfn>
   457             </td>
   458           </tr>
   459           <tr>
   460             <td>
   461               <em>Value:</em>
   462             </td>
   463             <td>
   464               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;) ] ]*
   465             </td>
   466           </tr>
   467           <tr>
   468             <td>
   469               <em>Initial:</em>
   470             </td>
   471             <td>
   472               ease
   473             </td>
   474           </tr>
   475           <tr>
   476             <td>
   477               <em>Applies&nbsp;to:</em>
   478             </td>
   479             <td>
   480               all elements, :before and :after pseudo elements
   481             </td>
   482           </tr>
   483           <tr>
   484             <td>
   485               <em>Inherited:</em>
   486             </td>
   487             <td>
   488               no
   489             </td>
   490           </tr>
   491           <tr>
   492             <td>
   493               <em>Percentages:</em>
   494             </td>
   495             <td>
   496               N/A
   497             </td>
   498           </tr>
   499           <tr>
   500             <td>
   501               <em>Media:</em>
   502             </td>
   503             <td>
   504               interactive
   505             </td>
   506           </tr>
   507           <tr>
   508             <td>
   509               <em>Computed value:</em>
   510             </td>
   511             <td>
   512               Same as specified value.
   513             </td>
   514           </tr>
   515         </tbody>
   516       </table>
   517       <p>
   518         The timing functions have the following definitions.
   519       </p>
   520       <dl>
   521         <dt>
   522           ease
   523         </dt>
   524         <dd>
   525           The ease function is equivalent to cubic-bezier(0.25, 0.1, 0.25, 1.0).
   526         </dd>
   527         <dt>
   528           linear
   529         </dt>
   530         <dd>
   531           The linear function is equivalent to cubic-bezier(0.0, 0.0, 1.0, 1.0).
   532         </dd>
   533         <dt>
   534           ease-in
   535         </dt>
   536         <dd>
   537           The ease-in function is equivalent to cubic-bezier(0.42, 0, 1.0, 1.0).
   538         </dd>
   539         <dt>
   540           ease-out
   541         </dt>
   542         <dd>
   543           The ease-out function is equivalent to cubic-bezier(0, 0, 0.58, 1.0).
   544         </dd>
   545         <dt>
   546           ease-in-out
   547         </dt>
   548         <dd>
   549           The ease-in-out function is equivalent to cubic-bezier(0.42, 0, 0.58, 1.0)
   550         </dd>
   551         <dt>
   552           step-start
   553         </dt>
   554         <dd>
   555           The step-start function is equivalent to steps(1, start).
   556         </dd>
   557         <dt>
   558           step-end
   559         </dt>
   560         <dd>
   561           The step-end function is equivalent to steps(1, end).
   562         </dd>
   563         <dt>
   564           steps
   565         </dt>
   566         <dd>
   567           Specifies a stepping function, described above, taking two
   568           parameters. The first parameter specifies the number of intervals
   569           in the function. It must be a positive integer (greater than 0).
   570           The second parameter, which is optional, is
   571           either the value 'start' or 'end', and specifies the point
   572           at which the change of values occur within the interval.
   573           If the second parameter is omitted, it is given the value 'end'.
   574         </dd>
   575         <dt>
   576           cubic-bezier
   577         </dt>
   578         <dd>
   579           Specifies a <a
   580           href="http://en.wikipedia.org/wiki/B%C3%A9zier_curve">cubic-bezier
   581           curve</a>. The four values specify points P<sub>1</sub> and
   582           P<sub>2</sub> of the curve as (x1, y1, x2, y2). Both x values must be
   583           in the range [0, 1] or the definition is invalid. The y values can
   584           exceed this range.
   585         </dd>
   586       </dl><!-- ======================================================================================================= -->
   587       <h3>
   588         The <code class="property">'transition-delay'</code> Property
   589       </h3>
   590       <p>
   591         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.
   592       </p>
   593       <p>
   594         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.
   595       </p>
   596       <table class="propdef">
   597         <tbody>
   598           <tr>
   599             <td>
   600               <em>Name:</em>
   601             </td>
   602             <td>
   603               <dfn id="transition-delay">transition-delay</dfn>
   604             </td>
   605           </tr>
   606           <tr>
   607             <td>
   608               <em>Value:</em>
   609             </td>
   610             <td>
   611               &lt;time&gt; [, &lt;time&gt;]*
   612             </td>
   613           </tr>
   614           <tr>
   615             <td>
   616               <em>Initial:</em>
   617             </td>
   618             <td>
   619               0s
   620             </td>
   621           </tr>
   622           <tr>
   623             <td>
   624               <em>Applies&nbsp;to:</em>
   625             </td>
   626             <td>
   627               all elements, :before and :after pseudo elements
   628             </td>
   629           </tr>
   630           <tr>
   631             <td>
   632               <em>Inherited:</em>
   633             </td>
   634             <td>
   635               no
   636             </td>
   637           </tr>
   638           <tr>
   639             <td>
   640               <em>Percentages:</em>
   641             </td>
   642             <td>
   643               N/A
   644             </td>
   645           </tr>
   646           <tr>
   647             <td>
   648               <em>Media:</em>
   649             </td>
   650             <td>
   651               interactive
   652             </td>
   653           </tr>
   654           <tr>
   655             <td>
   656               <em>Computed value:</em>
   657             </td>
   658             <td>
   659               Same as specified value.
   660             </td>
   661           </tr>
   662         </tbody>
   663       </table><!-- ======================================================================================================= -->
   664       <h3>
   665         The <code class="property">'transition'</code> Shorthand Property
   666       </h3>
   667       <p>
   668         The <code class="property">'transition'</code> shorthand property combines the four properties described above into a single property.
   669       </p>
   670       <p>
   671         Note that order is important in this property. The first value that can be
   672         parsed as a time is assigned to the transition-duration. The second value that
   673         can be parsed as a time is assigned to transition-delay.
   674       </p>
   675       <p class="issue">
   676         An alternative proposal is to accept the font shorthand approach of
   677         using a "/" character between the values of the same type. e.g. 2s/4s would
   678         mean a duration of 2 seconds and a delay of 4 seconds.
   679       </p>
   680       <table class="propdef">
   681         <tbody>
   682           <tr>
   683             <td>
   684               <em>Name:</em>
   685             </td>
   686             <td>
   687               <dfn id="transition">transition</dfn>
   688             </td>
   689           </tr>
   690           <tr>
   691             <td>
   692               <em>Value:</em>
   693             </td>
   694             <td>
   695               [&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;]]*
   696             </td>
   697           </tr>
   698           <tr>
   699             <td>
   700               <em>Initial:</em>
   701             </td>
   702             <td>
   703               see individual properties
   704             </td>
   705           </tr>
   706           <tr>
   707             <td>
   708               <em>Applies&nbsp;to:</em>
   709             </td>
   710             <td>
   711               all elements, :before and :after pseudo elements
   712             </td>
   713           </tr>
   714           <tr>
   715             <td>
   716               <em>Inherited:</em>
   717             </td>
   718             <td>
   719               no
   720             </td>
   721           </tr>
   722           <tr>
   723             <td>
   724               <em>Percentages:</em>
   725             </td>
   726             <td>
   727               N/A
   728             </td>
   729           </tr>
   730           <tr>
   731             <td>
   732               <em>Media:</em>
   733             </td>
   734             <td>
   735               interactive
   736             </td>
   737           </tr>
   738           <tr>
   739             <td>
   740               <em>Computed value:</em>
   741             </td>
   742             <td>
   743               Same as specified value.
   744             </td>
   745           </tr>
   746         </tbody>
   747       </table>
   749       <h2 id="starting">
   750         Starting of transitions
   751       </h2>
   753       <p>
   754         When the computed value of an animatable property changes,
   755         implementations must decide what transitions to start based on
   756         the values of the 'transition-property', 'transition-duration',
   757         'transition-timing-function', and 'transition-delay' properties
   758         at the time the animatable property would first have its new
   759         computed value.
   760       </p>
   761       <div class="example" id="manual-reversing-example">
   762         <p style="display:none">
   763           Example(s):
   764         </p>
   765         <p>This provides a way for authors to specify different values
   766         of the 'transition-*' properties for the &ldquo;forward&rdquo;
   767         and &ldquo;reverse&rdquo; transitions (but see <a
   768         href="#reversing">below</a> for special reversing behavior when
   769         an <em>incomplete</em> transition is interrupted).  Authors can
   770         specify the value of 'transition-duration',
   771         'transition-timing-function', or 'transition-delay' in the same
   772         rule where they specify the value that triggers the transition,
   773         or can change these properties at the same time as they change
   774         the property that triggers the transition.  Since it's the new
   775         values of these 'transition-*' properties that affect the
   776         transition, these values will be used for the transitions
   777         <em>to</em> the associated transitioning values.  For example:
   778          </p>
   779         <pre>li {
   780   transition: background-color linear 1s;
   781   background: blue;
   782 }
   783 li:hover {
   784   background-color: green;
   785   transition-duration: 2s; /* applies to the transition *to* the :hover state */
   786 }</pre>
   787         <p>
   788           When a list item with these style rules enters the :hover
   789           state, the computed 'transition-duration' at the time that
   790           'background-color' would have its new value ('green') is '2s',
   791           so the transition from 'blue' to 'green' takes 2 seconds.
   792           However, when the list item leaves the :hover state, the
   793           transition from 'green' to 'blue' takes 1 second.
   794         </p>
   795       </div>
   797       <p>
   798         When the computed value of a property changes, implementations
   799         must start transitions based on the relevant item (see <a
   800         href="#transition-property">the definition of
   801         'transition-property'</a>) in the computed value of
   802         'transition-property'.  Corresponding to this item there are
   803         values of 'transition-duration' and 'transition-delay' (see <a
   804         href="#list-matching">the rules on matching lists</a>).  Define
   805         the <dfn>combined duration</dfn> of the transition as the sum of
   806         max('transition-duration', '0s') and 'transition-delay'.  When
   807         the combined duration is greater than '0s', then a transition
   808         starts based on the values of 'transition-duration',
   809         'transition-delay', and 'transition-timing-function'; in other
   810         cases transitions do not occur.
   811       </p>
   813       <p>
   814         Since this specification does not define
   815         when computed values change, and thus what changes to
   816         computed values are considered simultaneous,
   817         authors should be aware that changing any of the transition
   818         properties a small amount of time after making a change that
   819         might transition can result in behavior that varies between
   820         implementations, since the changes might be considered
   821         simultaneous in some implementations but not others.
   822       </p>
   823       <p class="note">Say something about simultaneity</p>
   825       <p>
   826         Once the transition of a property has started, it must continue
   827         running based on the original timing function, duration, and
   828         delay, even if the 'transition-timing-function',
   829         'transition-duration', or 'transition-delay' property changes
   830         before the transition is complete.  However, if the
   831         'transition-property' property changes such that the transition
   832         would not have started, the transition must stop (and the
   833         property must immediately change to its final value).
   834       </p>
   836       <p>
   837         Implementations must not start a transition when the computed
   838         value of a property changes as a result of declarative animation
   839         (as opposed to scripted animation).
   840       </p>
   842       <p>
   843         Implementations also must not start a transition when the
   844         computed value changes because it is inherited (directly or
   845         indirectly) from another element that is transitioning the same
   846         property.
   847       </p>
   849       <h2 id="reversing">
   850         Automatically reversing interrupted transitions
   851       </h2>
   852       <p>
   853         A common type of transition effect is when a running transition is
   854         interrupted and the property is reset to its original value. An
   855         example is a hover effect on an element, where the pointer enters and
   856         exits the element before the effect has completed. If the outgoing and
   857         incoming transitions are executed using their specified durations and
   858         timing functions, the resulting effect can be distractingly
   859         asymmetric. Instead, the expected behavior is that the new transition
   860         should be the reverse of what has already executed.
   861       </p>
   863       <p>
   864         If a running transition with duration T, executing so far for duration TE, 
   865         from state A, to state B, is interrupted by
   866         a property change that would start a new transition back to state A, and
   867         all the transition attributes are the same (duration, delay and timing function),
   868         then the new transition must reverse the effect. The new transition must:
   869       </p>
   871       <ol>
   872         <li>
   873           Use the B and A states as its "from" and "to" states respectively. It
   874           does not use the current value as its from state, due to the rules below.
   875         </li>
   876         <li>
   877           Execute with the same duration T, but starting as if the transition had
   878           already begun, without any transition delay, at the moment which would
   879           cause the new transition to finish in TE from the moment of interruption. In other
   880           words, the new transition will execute as if it started T-TE in the past.
   881         </li>
   882         <li>
   883           Use a timing function that is the portion of the curve traversed up
   884           to the moment of interruption, followed in the opposite direction (towards
   885           the starting point). This will make the transition appear as if it 
   886           is playing backwards.
   887         </li>
   888         <li>
   889           Ignore any transition delay.
   890         </li>
   891       </ol>
   893       <p>
   894         For example, suppose there is a transition with a duration of two
   895         seconds. If this transition is interrupted after 0.5 seconds and the
   896         property value assigned to the original value, then the new transition
   897         effect will be the reverse of the original, as if it had begun
   898         1.5 seconds in the past.
   899       </p>
   901       <p>
   902         Note that by using the defined from and to states for the reversing
   903         transition, it is also possible that it may reverse again, if
   904         interrupted; for example, if the transition reversing to state A was
   905         again interrupted by a property change to state B.
   906       </p>
   908       <p class="issue">Issue:
   909         This introduces the concept of reversing a timing function,
   910         which the spec has otherwise resisted doing, and also introduces
   911         a discontinuity between transitions that have
   912         almost completed (which get automatically reversed and thus have
   913         their timing function reversed) and transitions that have fully
   914         completed (where the reversal doesn't lead to the timing
   915         function being reversed).  An alternative proposal that avoids
   916         this is to follow the normal timing function algorithm, except
   917         multiply the duration (and also shorten any negative delay) by
   918         the (output) value of the transition timing function of the
   919         incomplete transition at the time it was interrupted, and, to
   920         account for multiple reverses in sequence, to divide by the
   921         shortening applied to the transition being interrupted.  For
   922         more details see this thread:
   923         <a href="http://lists.w3.org/Archives/Public/www-style/2009Nov/thread.html#msg302">November 2009 part</a>,
   924         <a href="http://lists.w3.org/Archives/Public/www-style/2009Dec/thread.html#msg319">December 2009 part</a>,
   925         <a href="http://lists.w3.org/Archives/Public/www-style/2010Jan/thread.html#msg136">January 2010 part</a>.
   926       </p>
   928       <h2>
   929         Transition Events
   930       </h2>
   931       <p>
   932         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>.
   933         An event is fired for each property that undergoes a transition.
   934         This allows a content developer to perform actions that synchronize
   935         with the completion of a transition.
   936       </p>
   937       <p>
   938         Each event provides the name of the property the transition is
   939         associated with as well as the duration of the transition.
   940       </p>
   941       <dl>
   942         <dt>
   943           <b>Interface <i><a id="Events-TransitionEvent" name='Events-TransitionEvent'>TransitionEvent</a></i></b>
   944         </dt>
   945         <dd>
   946           <p>
   947             The <code>TransitionEvent</code> interface provides specific contextual information associated with transitions.
   948           </p>
   949           <dl>
   950             <dt>
   951               <b>IDL Definition</b>
   952             </dt>
   953             <dd>
   954               <div class='idl-code'>
   955                 <pre>
   956   interface TransitionEvent : Event {
   957     readonly attribute DOMString          propertyName;
   958     readonly attribute float              elapsedTime;
   959     readonly attribute DOMString          pseudoElement;
   960     void               initTransitionEvent(in DOMString typeArg, 
   961                                           in boolean canBubbleArg, 
   962                                           in boolean cancelableArg, 
   963                                           in DOMString propertyNameArg,
   964                                           in float elapsedTimeArg,
   965                                           in DOMString pseudoElementArg);
   966   };
   967   </pre>
   968               </div>
   969             </dd>
   970             <dt>
   971               <b>Attributes</b>
   972             </dt>
   973             <dd>
   974               <dl>
   975                 <dt>
   976                   <code class='attribute-name'><a id="Events-TransitionEvent-propertyName" name='Events-TransitionEvent-propertyName'>propertyName</a></code> of type <code>DOMString</code>, readonly
   977                 </dt>
   978                 <dd>
   979                   The name of the CSS property associated with the transition.
   980                 </dd>
   981               </dl>
   982               <dl>
   983                 <dt>
   984                   <code class='attribute-name'><a id="Events-TransitionEvent-elapsedTime" name='Events-TransitionEvent-elapsedTime'>elapsedTime</a></code> of type <code>float</code>, readonly
   985                 </dt>
   986                 <dd>
   987                   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>.
   988                 </dd>
   989               </dl>
   990               <dl>
   991                 <dt>
   992                   <code class='attribute-name'><a id="Events-TransitionEvent-pseudoElement" name='Events-TransitionEvent-pseudoElement'>pseudoElement</a></code> of type <code>DOMString</code>, readonly
   993                 </dt>
   994                 <dd>
   995                   The name (beginning with two colons) of the CSS
   996                   pseudo-element on which the transition occured (in
   997                   which case the target of the event is that
   998                   pseudo-element's corresponding element), or the empty
   999                   string if the transition occurred on an element (which
  1000                   means the target of the event is that element).
  1001                 </dd>
  1002               </dl>
  1003             </dd>
  1004             <dt>
  1005               <b>Methods</b>
  1006             </dt>
  1007             <dd>
  1008               <dl>
  1009                 <dt>
  1010                   <code class='method-name'><a id="Events-TransitionEvent-initTransitionEvent" name='Events-TransitionEvent-initTransitionEvent'>initTransitionEvent</a></code>
  1011                 </dt>
  1012                 <dd>
  1013                   <div class='method'>
  1014                     The <code>initTransitionEvent</code> method is used to
  1015                     initialize the value of a <code>TransitionEvent</code>
  1016                     created through the <a
  1017                     href='http://www.w3.org/TR/DOM-Level-2-Events/events.html#Events-DocumentEvent'><code>DocumentEvent</code></a>
  1018                     interface. This method may only be called before the
  1019                     <code>TransitionEvent</code> has been dispatched via the
  1020                     <code>dispatchEvent</code> method, though it may be called
  1021                     multiple times during that phase if necessary. If called
  1022                     multiple times, the final invocation takes precedence.
  1023                     <p class="issue">Should new events being created still
  1024                     have init*Event methods?</p>
  1025                     <div class='parameters'>
  1026                       <b>Parameters</b>
  1027                       <div class='paramtable'>
  1028                         <dl>
  1029                           <dt>
  1030                             <code class='parameter-name'>typeArg</code> of type <code>DOMString</code>
  1031                           </dt>
  1032                           <dd>
  1033                             Specifies the event type.<br>
  1034                           </dd>
  1035                           <dt>
  1036                             <code class='parameter-name'>canBubbleArg</code> of type <code>boolean</code>
  1037                           </dt>
  1038                           <dd>
  1039                             Specifies whether or not the event can bubble.<br>
  1040                           </dd>
  1041                           <dt>
  1042                             <code class='parameter-name'>cancelableArg</code> of type <code>boolean</code>
  1043                           </dt>
  1044                           <dd>
  1045                             Specifies whether or not the event's default action can be prevented. Since a TransitionEvent
  1046                             is purely for notification, there is no default action.<br>
  1047                           </dd>
  1048                           <dt>
  1049                             <code class='parameter-name'>propertyNameArg</code> of type <code>DOMString</code>
  1050                           </dt>
  1051                           <dd>
  1052                             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>.
  1053                             (See the <a href="#Events-TransitionEvent-propertyName">propertyName</a> attribute.)
  1054                           </dd>
  1055                           <dt>
  1056                             <code class='parameter-name'>elapsedTimeArg</code> of type <code>float</code>
  1057                           </dt>
  1058                           <dd>
  1059                             Specifies the amount of time, in seconds, the transition has been running at the time of initialization.
  1060                             (See the <a href="#Events-TransitionEvent-elapsedTime">elapsedTime</a> attribute.)
  1061                           </dd>
  1062                           <dt>
  1063                             <code class='parameter-name'>pseudoElementArg</code> of type <code>DOMString</code>
  1064                           </dt>
  1065                           <dd>
  1066                             Specifies the pseudo-element on which the
  1067                             transition occurred.
  1068                             (See the <a href="#Events-TransitionEvent-pseudoElement">pseudoElement</a> attribute.)
  1069                             <span class="issue">Does adding this additional argument create any compatibility problems?</span>
  1070                           </dd>
  1071                         </dl>
  1072                       </div>
  1073                     </div><!-- parameters -->
  1074                     <div>
  1075                       <b>No Return Value</b>
  1076                     </div>
  1077                     <div>
  1078                       <b>No Exceptions</b>
  1079                     </div>
  1080                   </div><!-- method -->
  1081                 </dd>
  1082               </dl>
  1083             </dd>
  1084           </dl>
  1085         </dd>
  1086       </dl>
  1087       <p>
  1088         There is one type of transition event available.
  1089       </p>
  1090       <dl>
  1091         <dt>
  1092           <b>transitionend</b>
  1093         </dt>
  1094         <dd>
  1095           The 'transitionend' event occurs at the completion of the transition. In the
  1096           case where a transition is removed before completion, such as if the
  1097           transition-property is removed, then the event will not fire.
  1098           <ul>
  1099             <li>Bubbles: Yes
  1100             </li>
  1101             <li>Cancelable: Yes
  1102             </li>
  1103             <li>Context Info: propertyName, elapsedTime
  1104             </li>
  1105           </ul>
  1106         </dd>
  1107       </dl>
  1109       <h2 id="animation-of-property-types-">
  1110         Animation of property types
  1111       </h2>
  1113       <p>
  1114         The following describes how each property type undergoes transition or
  1115         animation.
  1116       </p>
  1118       <ul>
  1119         <li>
  1120           <strong>color</strong>: interpolated via red, green, blue and alpha
  1121           components (treating each as a number, see below).
  1122           <div class="issue">Issue: Are the colors interpolated in
  1123           premultiplied space or non-premultiplied space?</div>
  1124         </li>
  1125         <li>
  1126           <strong>length</strong>: interpolated as real numbers.
  1127         </li>
  1128         <li>
  1129           <strong>percentage</strong>: interpolated as real numbers.
  1130         </li>
  1131         <li>
  1132           <strong>integer</strong>: interpolated via discrete steps (whole
  1133           numbers). The interpolation happens in real number space and is
  1134           converted to an integer using <code>floor()</code>.
  1135           <span class="issue">
  1136             This floor behavior is inconsistent with SMIL Animation /
  1137             SVG Animation.
  1138           </span>
  1139         </li>
  1140         <li>
  1141           <strong>font weight</strong>: interpolated via discrete steps
  1142           (multiples of 100). The interpolation happens in real number
  1143           space and is converted to an integer by rounding to the
  1144           nearest multiple of 100.
  1145           <span class="issue">
  1146             This round-to-nearest behavior is inconsistent with the
  1147             floor behavior used for integer types, but probably should
  1148             be consistent (one way or the other).
  1149           </span>
  1150         </li>
  1151         <li>
  1152           <strong>number</strong>: interpolated as real (floating point)
  1153           numbers.
  1154         </li>
  1155         <li>
  1156           <strong>transform list</strong>: see 
  1157             CSS Transforms specification [[!CSS3-TRANSFORMS]].
  1158         </li>
  1159         <li>
  1160           <strong>rectangle</strong>: interpolated via the x, y,
  1161           width and height components (treating each as a number).
  1162         </li>
  1163         <li>
  1164           <strong>visibility</strong>: if one of the values is
  1165           'visible', interpolated as a discrete step where values of the
  1166           timing function between 0 and 1 map to 'visible' and other
  1167           values of the timing function (which occur only at the
  1168           start/end of the transition or as a result of 'cubic-bezier()'
  1169           functions with Y values outside of [0, 1]) map to the closer
  1170           endpoint; if neither value is 'visible' then not interpolable.
  1171           </span>
  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</strong>: 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>
  1214         Animatable properties
  1215       </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>
  1241         Properties from CSS
  1242       </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>
  1408        Properties from SVG
  1409      </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> -->
  1459 <h2>References</h2>
  1461 <h3 class="no-num">Normative references</h3>
  1462 <!--normative-->
  1464 <h3 class="no-num">Other references</h3>
  1465 <!--informative-->
  1469 <h2 class="no-num">Property index</h2>
  1470 <!-- properties -->
  1474 <h2 class="no-num" id="index">Index</h2>
  1475 <!--index-->
  1477 </body>
  1478 </html>
  1479 <!-- Keep this comment at the end of the file
  1480 Local variables:
  1481 mode: sgml
  1482 sgml-default-doctype-name:"html"
  1483 sgml-minimize-attributes:t
  1484 End:
  1485 -->

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