css-transitions/Overview.src.html

Mon, 06 May 2013 17:23:49 -0700

author
L. David Baron <dbaron@dbaron.org>
date
Mon, 06 May 2013 17:23:49 -0700
changeset 8064
172f4f12f059
parent 7921
0bc709e6bef5
child 8066
3ee3ec0b5a5b
permissions
-rw-r--r--

[css-transitions][css-animations] Define initial values of event properties. (Using the initializers in the init dict is not sufficient because of CreateEvent.) Also fix link to DOM Core.

     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     div.prod { margin: 1em 2em; }
    18   </style>
    19   <link rel="stylesheet" type="text/css" href="http://www.w3.org/StyleSheets/TR/W3C-[STATUS].css">
    20 </head>
    22 <body>
    24 <div class="head">
    25 <!--logo-->
    27 <h1>CSS Transitions</h1>
    29 <h2 class="no-num no-toc">[LONGSTATUS] [DATE]</h2>
    30 <dl>
    31   <dt>This version:
    32     <dd>
    33     <a href="[VERSION]">[VERSION]</a>
    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     (<a href="https://dvcs.w3.org/hg/csswg/log/tip/css-transitions/Overview.src.html">change log</a>,
    40     <a href="https://dvcs.w3.org/hg/csswg/log/tip/css3-transitions/Overview.src.html">older change log</a>)
    41   <dt>Previous version:
    42     <dd><a href="http://www.w3.org/TR/2013/WD-css3-transitions-20130212/">http://www.w3.org/TR/2013/WD-css3-transitions-20130212/</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>Feedback:
    57     <dd><a href="mailto:www-style@w3.org?subject=%5Bcss-transitions%5D%20feedback">www-style@w3.org</a>
    58         with subject line &ldquo;<kbd>[css-transitions] <var>&hellip; message topic &hellip;</var></kbd>&rdquo;
    59         (<a rel="discussion" href="http://lists.w3.org/Archives/Public/www-style/">archives</a>)
    61   <dt>Test suite:
    62     <dd>none yet
    63 </dl>
    65 <!--copyright-->
    67 <hr title="Separator for header">
    68 </div>
    70 <h2 class="no-num no-toc" id="abstract">Abstract</h2>
    72 <p>CSS Transitions allows property changes in CSS values to occur smoothly
    73   over a specified duration.
    75 <h2 class="no-num no-toc" id="status">Status of this document</h2>
    76 <!--status-->
    78 <p>
    79   The <a href="ChangeLog">list of changes made to this specification</a> is
    80   available.
    81 </p>
    83 <h2 class="no-num no-toc" id="contents">Table of Contents</h2>
    84 <!--toc-->
    87 <h2 id="introduction">Introduction</h2>
    89       <p><em>This section is not normative.</em>
    90       <p>
    91         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.
    92       </p>
    94 <h2 id="transitions"><a id="transitions-">Transitions</a></h2>
    95       <p>
    96         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.
    97       </p>
    98       <p>
    99         For example, suppose that transitions of one second have been defined on the 'left' and
   100         'background-color' 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.
   101       </p>
   102       <div class="figure">
   103         <img src="transition1.png" alt="">
   104       </div>
   105       <p class="caption">
   106         Transitions of 'left' and 'background-color'
   107       </p>
   108       <p>
   109         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.
   110       </p>
   111       <p>
   112         Only animatable CSS properties can be transitioned. See the table at the end of this document for a list 
   113         of properties that are animatable.
   114       </p>
   115       <p>
   116         The transition for a property is defined using a number of new properties. For example:
   117       </p>
   118       <div class="example">
   119         <p style="display:none">
   120           Example(s):
   121         </p>
   122         <pre>
   123   div {
   124     transition-property: opacity;
   125     transition-duration: 2s;
   126   }
   127   </pre>The above example defines a transition on the 'opacity' 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.
   128       </div>
   129       <p>
   130         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:
   131       </p>
   132       <div class="example">
   133         <p style="display:none">
   134           Example(s):
   135         </p>
   136         <pre>
   137   div {
   138     transition-property: opacity, left;
   139     transition-duration: 2s, 4s;
   140   }
   142   </pre>This will cause the 'opacity' property to transition over a period of two seconds and the left property to transition over a period of four seconds.
   143       </div>
   145       <p id="list-matching">
   146         In the case where the lists of values in transition properties
   147         do not have the same length, the length of the
   148         'transition-property' list determines the number of items in
   149         each list examined when starting transitions.  The lists are
   150         matched up from the first value: excess values at the end are
   151         not used.  If one of the other properties doesn't have enough
   152         comma-separated values to match the number of values of
   153         'transition-property', the UA must calculate its used value by
   154         repeating the list of values until there are enough.  This
   155         truncation or repetition does not affect the computed value.
   156         <span class="note">
   157           Note: This is analogous to the behavior of the 'background-*'
   158           properties, with 'background-image' analogous to
   159           'transition-property'.
   160         </span>
   161       </p>
   163       <div class="example">
   164         <p style="display:none">
   165           Example(s):
   166         </p>
   167       <pre>
   168       div {
   169         transition-property: opacity, left, top, width;
   170         transition-duration: 2s, 1s;
   171       }
   172       </pre>The above example defines a transition on the 'opacity' property of 2 seconds duration, a
   173       transition on the 'left' property of 1
   174       second duration, a transition on the 'top' property of 2 seconds duration and a
   175       transition on the 'width' property of 1
   176       second duration.
   178       </div>
   180       <p>
   181         While authors can use transitions to create dynamically changing content,
   182         dynamically changing content can lead to seizures in some users.
   183         For information on how to avoid content that can lead to seizures, see
   184         <a href="http://www.w3.org/TR/WCAG20/#seizure">Guideline 2.3:
   185         Seizures:
   186         Do not design content in a way that is known to cause seizures</a>
   187         ([[WCAG20]]).
   188       </p>
   190       <!-- ======================================================================================================= -->
   191       <h3 id="transition-property-property"><a id="the-transition-property-property-">
   192         The 'transition-property' Property
   193       </a></h3>
   194       <p>
   195         The 'transition-property' property specifies the name of the CSS property to which the transition is applied.
   196       </p>
   197       <table class="propdef">
   198         <tbody>
   199           <tr>
   200             <td>
   201               <em>Name:</em>
   202             </td>
   203             <td>
   204               <dfn id="transition-property">transition-property</dfn>
   205             </td>
   206           </tr>
   207           <tr>
   208             <td>
   209               <em>Value:</em>
   210             </td>
   211             <td>
   212               none | <span>&lt;single-transition-property&gt;</span> [ ',' <span>&lt;single-transition-property&gt;</span> ]*
   213             </td>
   214           </tr>
   215           <tr>
   216             <td>
   217               <em>Initial:</em>
   218             </td>
   219             <td>
   220               all
   221             </td>
   222           </tr>
   223           <tr>
   224             <td>
   225               <em>Applies to:</em>
   226             </td>
   227             <td>
   228               all elements, :before and :after pseudo elements
   229             </td>
   230           </tr>
   231           <tr>
   232             <td>
   233               <em>Inherited:</em>
   234             </td>
   235             <td>
   236               no
   237             </td>
   238           </tr>
   239           <tr>
   240             <td>
   241               <em>Animatable:</em>
   242             </td>
   243             <td>
   244               no
   245             </td>
   246           </tr>
   247           <tr>
   248             <td>
   249               <em>Percentages:</em>
   250             </td>
   251             <td>
   252               N/A
   253             </td>
   254           </tr>
   255           <tr>
   256             <td>
   257               <em>Media:</em>
   258             </td>
   259             <td>
   260               visual
   261             </td>
   262           </tr>
   263           <tr>
   264             <td>
   265               <em>Computed value:</em>
   266             </td>
   267             <td>
   268               Same as specified value.
   269             </td>
   270           </tr>
   271           <tr>
   272             <td>
   273               <em>Canonical order:</em>
   274             </td>
   275             <td>
   276               <abbr title="follows order of property value definition">per grammar</abbr>
   277             </td>
   278           </tr>
   279         </tbody>
   280       </table>
   282       <div class="prod">
   283         <dfn id="single-transition-property">&lt;single-transition-property&gt;</dfn> = all | &lt;IDENT&gt;
   284       </div>
   286       <p>
   287         A value of ''none'' means that no property will transition.
   288         Otherwise, a list of properties to be transitioned, or the
   289         keyword ''all'' which indicates that all properties are to be
   290         transitioned, is given.
   291       </p>
   293       <p>
   294         If one of the identifiers listed is not a recognized property
   295         name or is not an animatable property, the implementation must
   296         still start transitions on the animatable properties in the
   297         list using the duration, delay, and timing function at their
   298         respective indices in the lists for 'transition-duration',
   299         'transition-delay', and 'transition-timing-function'.  In other
   300         words, unrecognized or non-animatable properties must be kept in
   301         the list to preserve the matching of indices.
   302       </p>
   304       <p>
   305         The keywords ''none'', ''inherit'', and ''initial'' are not
   306         permitted as items within a list of more that one identifier;
   307         any list that uses them is syntactically invalid.
   308         In other words, the &lt;IDENT&gt; production in
   309         <span>&lt;single-transition-property&gt;</span> matches any
   310         identifier other than these three keywords.
   311       </p>
   313       <p>
   314         For the keyword ''all'', or if one of the identifiers listed is a
   315         shorthand property, implementations must start transitions for
   316         any of its longhand sub-properties that are animatable (or, for
   317         ''all'', all animatable properties), using the duration, delay,
   318         and timing function at the index corresponding to the shorthand.
   319       </p>
   320       <p>
   321         If a property is specified multiple times in the value of
   322         'transition-property' (either on its own, via a shorthand that
   323         contains it, or via the ''all'' value), then the transition that
   324         starts uses the duration, delay, and timing function at the
   325         index corresponding to the <em>last</em> item in the value of
   326         'transition-property' that calls for animating that property.
   327       </p>
   328       <p class="note">
   329         Note:  The ''all'' value and 'all' shorthand
   330         property work in similar ways, so the
   331         ''all'' value is just like a shorthand that
   332         covers all properties.
   333       </p>
   335       <!-- ======================================================================================================= -->
   336       <h3 id="transition-duration-property"><a id="the-transition-duration-property-">
   337         The 'transition-duration' Property
   338       </a></h3>
   339       <p>
   340         The 'transition-duration' property defines the length of time that a transition takes.
   341       </p>
   342       <table class="propdef">
   343         <tbody>
   344           <tr>
   345             <td>
   346               <em>Name:</em>
   347             </td>
   348             <td>
   349               <dfn id="transition-duration">transition-duration</dfn>
   350             </td>
   351           </tr>
   352           <tr>
   353             <td>
   354               <em>Value:</em>
   355             </td>
   356             <td>
   357               <span>&lt;time&gt;</span> [, <span>&lt;time&gt;</span>]*
   358             </td>
   359           </tr>
   360           <tr>
   361             <td>
   362               <em>Initial:</em>
   363             </td>
   364             <td>
   365               0s
   366             </td>
   367           </tr>
   368           <tr>
   369             <td>
   370               <em>Applies to:</em>
   371             </td>
   372             <td>
   373               all elements, :before and :after pseudo elements
   374             </td>
   375           </tr>
   376           <tr>
   377             <td>
   378               <em>Inherited:</em>
   379             </td>
   380             <td>
   381               no
   382             </td>
   383           </tr>
   384           <tr>
   385             <td>
   386               <em>Animatable:</em>
   387             </td>
   388             <td>
   389               no
   390             </td>
   391           </tr>
   392           <tr>
   393             <td>
   394               <em>Percentages:</em>
   395             </td>
   396             <td>
   397               N/A
   398             </td>
   399           </tr>
   400           <tr>
   401             <td>
   402               <em>Media:</em>
   403             </td>
   404             <td>
   405               interactive
   406             </td>
   407           </tr>
   408           <tr>
   409             <td>
   410               <em>Computed value:</em>
   411             </td>
   412             <td>
   413               Same as specified value.
   414             </td>
   415           </tr>
   416           <tr>
   417             <td>
   418               <em>Canonical order:</em>
   419             </td>
   420             <td>
   421               <abbr title="follows order of property value definition">per grammar</abbr>
   422             </td>
   423           </tr>
   424         </tbody>
   425       </table>
   426       <p>
   427         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 'transition-duration' renders the declaration invalid.
   428       </p>
   430       <!-- =======================================================================================================   
   431         -->
   433       <h3 id="transition-timing-function-property"><a id="transition-timing-function_tag">
   434         The 'transition-timing-function' Property
   435       </a></h3>
   436       <p>
   437         The 'transition-timing-function' property
   438         describes how the intermediate values used during a transition will be
   439         calculated. It allows for a transition to change speed over its
   440         duration. These effects are commonly called <em>easing</em> functions.
   441         In either case, a mathematical function that provides a smooth curve is
   442         used.
   443       </p>
   444       <p>
   445         Timing functions are either defined as a stepping function or 
   446         a <a
   447         href="http://en.wikipedia.org/wiki/B%C3%A9zier_curve#Cubic_B.C3.A9zier_curves">cubic
   448         B&eacute;zier curve</a>. 
   449         The timing function takes as its input
   450         the current elapsed percentage of the transition duration
   451         and outputs the percentage of the way the transition is
   452         from its start value to its end value.
   453         How this output is used is defined by
   454         the <a href="#animatable-types">interpolation rules</a>
   455         for the value type.
   456       </p>
   457       <p>
   458         A <a href="http://en.wikipedia.org/wiki/Step_function">stepping</a>
   459         function is defined by a number that divides the domain of operation
   460         into equally sized intervals. Each subsequent interval is a equal step
   461         closer to the goal state. The function also specifies whether the
   462         change in output percentage happens at the start or end of the
   463         interval (in other words, if 0% on the input percentage is the point
   464         of initial change).
   465       </p>
   466       <div class="figure">
   467         <img src="step.png" alt="The step timing function splits
   468           the function domain into a number of disjoint straight line
   469           segments. steps(1, start) is a function whose
   470           output value is 1 for all input values. steps(1, end) is a function whose
   471           output value is 0 for all input values less than 1, and output
   472           is 1 for the input value of 1. steps(3, start) is a function that
   473           divides the input domain into three segments, each 1/3 in length,
   474           and 1/3 above the previous segment, with the first segment starting
   475           at 1/3. steps(3, end) is a function that
   476           divides the input domain into three segments, each 1/3 in length,
   477           and 1/3 above the previous segment, with the first segment starting
   478           at 0.">
   479       </div>
   480       <p class="caption">
   481         Step timing functions
   482       </p>
   483       <p>
   484         A <a
   485         href="http://en.wikipedia.org/wiki/B%C3%A9zier_curve#Cubic_B.C3.A9zier_curves">cubic
   486         B&eacute;zier curve</a> is defined by four control points, P<sub>0</sub>
   487         through P<sub>3</sub> (see Figure 1). P<sub>0</sub> and P<sub>3</sub>
   488         are always set to (0,0) and (1,1). The 'transition-timing-function' property is used
   489         to specify the values for points P<sub>1</sub> and P<sub>2</sub>. These
   490         can be set to preset values using the keywords listed below, or can be
   491         set to specific values using the ''cubic-bezier'' function.
   492         In the ''cubic-bezier'' function, P<sub>1</sub> and
   493         P<sub>2</sub> are each specified by both an X and Y value.
   494       </p>
   495       <div class="figure">
   496         <img src="TimingFunction.png" alt="The B&eacute;zier timing function is a
   497           smooth curve from point P0 = (0,0) to point P3 = (1,1). The
   498           length and orientation of the line segment P0-P1 determines
   499           the tangent and the curvature of the curve at P0 and the
   500           line segment P2-P3 does the same at P3.">
   501       </div>
   502       <p class="caption">
   503         B&eacute;zier Timing Function Control Points
   504       </p>
   505       <table class="propdef">
   506         <tbody>
   507           <tr>
   508             <td>
   509               <em>Name:</em>
   510             </td>
   511             <td>
   512               <dfn id="transition-timing-function">transition-timing-function</dfn>
   513             </td>
   514           </tr>
   515           <tr>
   516             <td>
   517               <em>Value:</em>
   518             </td>
   519             <td>
   520               <span>&lt;single-transition-timing-function&gt;</span> [ ',' <span>&lt;single-transition-timing-function&gt;</span> ]*
   521             </td>
   522           </tr>
   523           <tr>
   524             <td>
   525               <em>Initial:</em>
   526             </td>
   527             <td>
   528               ease
   529             </td>
   530           </tr>
   531           <tr>
   532             <td>
   533               <em>Applies to:</em>
   534             </td>
   535             <td>
   536               all elements, :before and :after pseudo elements
   537             </td>
   538           </tr>
   539           <tr>
   540             <td>
   541               <em>Inherited:</em>
   542             </td>
   543             <td>
   544               no
   545             </td>
   546           </tr>
   547           <tr>
   548             <td>
   549               <em>Animatable:</em>
   550             </td>
   551             <td>
   552               no
   553             </td>
   554           </tr>
   555           <tr>
   556             <td>
   557               <em>Percentages:</em>
   558             </td>
   559             <td>
   560               N/A
   561             </td>
   562           </tr>
   563           <tr>
   564             <td>
   565               <em>Media:</em>
   566             </td>
   567             <td>
   568               interactive
   569             </td>
   570           </tr>
   571           <tr>
   572             <td>
   573               <em>Computed value:</em>
   574             </td>
   575             <td>
   576               Same as specified value.
   577             </td>
   578           </tr>
   579           <tr>
   580             <td>
   581               <em>Canonical order:</em>
   582             </td>
   583             <td>
   584               <abbr title="follows order of property value definition">per grammar</abbr>
   585             </td>
   586           </tr>
   587         </tbody>
   588       </table>
   589       <div class="prod">
   590         <dfn id="single-transition-timing-function">&lt;single-transition-timing-function&gt;</dfn> = 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;)
   591       </div>
   592       <p>
   593         The timing functions have the following definitions.
   594       </p>
   595       <dl>
   596         <dt>
   597           ease
   598         </dt>
   599         <dd>
   600           The ease function is equivalent to cubic-bezier(0.25, 0.1, 0.25, 1).
   601         </dd>
   602         <dt>
   603           linear
   604         </dt>
   605         <dd>
   606           The linear function is equivalent to cubic-bezier(0, 0, 1, 1).
   607         </dd>
   608         <dt>
   609           ease-in
   610         </dt>
   611         <dd>
   612           The ease-in function is equivalent to cubic-bezier(0.42, 0, 1, 1).
   613         </dd>
   614         <dt>
   615           ease-out
   616         </dt>
   617         <dd>
   618           The ease-out function is equivalent to cubic-bezier(0, 0, 0.58, 1).
   619         </dd>
   620         <dt>
   621           ease-in-out
   622         </dt>
   623         <dd>
   624           The ease-in-out function is equivalent to cubic-bezier(0.42, 0, 0.58, 1)
   625         </dd>
   626         <dt>
   627           step-start
   628         </dt>
   629         <dd>
   630           The step-start function is equivalent to steps(1, start).
   631         </dd>
   632         <dt>
   633           step-end
   634         </dt>
   635         <dd>
   636           The step-end function is equivalent to steps(1, end).
   637         </dd>
   638         <dt>
   639           steps(&lt;integer&gt;[, [ start | end ] ]?)
   640         </dt>
   641         <dd>
   642           Specifies a stepping function, described above, taking two
   643           parameters. The first parameter specifies the number of intervals
   644           in the function. It must be a positive integer (greater than 0).
   645           The second parameter, which is optional, is
   646           either the value ''start'' or ''end'', and specifies the point
   647           at which the change of values occur within the interval.
   648           If the second parameter is omitted, it is given the value 'end'.
   649         </dd>
   650         <dt>
   651           cubic-bezier(&lt;number&gt;, &lt;number&gt;, &lt;number&gt;, &lt;number&gt;)
   652         </dt>
   653         <dd>
   654           Specifies a <a
   655           href="http://en.wikipedia.org/wiki/B%C3%A9zier_curve">cubic-bezier
   656           curve</a>. The four values specify points P<sub>1</sub> and
   657           P<sub>2</sub> of the curve as (x1, y1, x2, y2). Both x values must be
   658           in the range [0, 1] or the definition is invalid. The y values can
   659           exceed this range.
   660         </dd>
   661       </dl><!-- ======================================================================================================= -->
   662       <h3 id="transition-delay-property"><a id="the-transition-delay-property-">
   663         The 'transition-delay' Property
   664       </a></h3>
   665       <p>
   666         The 'transition-delay' 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 'transition-delay' 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.
   667       </p>
   668       <p>
   669         If the value for 'transition-delay' 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 'transition-delay', the starting values are taken from the moment the property is changed.
   670       </p>
   671       <table class="propdef">
   672         <tbody>
   673           <tr>
   674             <td>
   675               <em>Name:</em>
   676             </td>
   677             <td>
   678               <dfn id="transition-delay">transition-delay</dfn>
   679             </td>
   680           </tr>
   681           <tr>
   682             <td>
   683               <em>Value:</em>
   684             </td>
   685             <td>
   686               <span>&lt;time&gt;</span> [, <span>&lt;time&gt;</span>]*
   687             </td>
   688           </tr>
   689           <tr>
   690             <td>
   691               <em>Initial:</em>
   692             </td>
   693             <td>
   694               0s
   695             </td>
   696           </tr>
   697           <tr>
   698             <td>
   699               <em>Applies to:</em>
   700             </td>
   701             <td>
   702               all elements, :before and :after pseudo elements
   703             </td>
   704           </tr>
   705           <tr>
   706             <td>
   707               <em>Inherited:</em>
   708             </td>
   709             <td>
   710               no
   711             </td>
   712           </tr>
   713           <tr>
   714             <td>
   715               <em>Animatable:</em>
   716             </td>
   717             <td>
   718               no
   719             </td>
   720           </tr>
   721           <tr>
   722             <td>
   723               <em>Percentages:</em>
   724             </td>
   725             <td>
   726               N/A
   727             </td>
   728           </tr>
   729           <tr>
   730             <td>
   731               <em>Media:</em>
   732             </td>
   733             <td>
   734               interactive
   735             </td>
   736           </tr>
   737           <tr>
   738             <td>
   739               <em>Computed value:</em>
   740             </td>
   741             <td>
   742               Same as specified value.
   743             </td>
   744           </tr>
   745           <tr>
   746             <td>
   747               <em>Canonical order:</em>
   748             </td>
   749             <td>
   750               <abbr title="follows order of property value definition">per grammar</abbr>
   751             </td>
   752           </tr>
   753         </tbody>
   754       </table><!-- ======================================================================================================= -->
   755       <h3 id="transition-shorthand-property"><a id="the-transition-shorthand-property-">
   756         The 'transition' Shorthand Property
   757       </a></h3>
   758       <p>
   759         The 'transition' shorthand property combines the four properties described above into a single property.
   760       </p>
   761       <table class="propdef">
   762         <tbody>
   763           <tr>
   764             <td>
   765               <em>Name:</em>
   766             </td>
   767             <td>
   768               <dfn id="transition">transition</dfn>
   769             </td>
   770           </tr>
   771           <tr>
   772             <td>
   773               <em>Value:</em>
   774             </td>
   775             <td>
   776               <span>&lt;single-transition&gt;</span> [ ',' <span>&lt;single-transition&gt;</span> ]*
   777             </td>
   778           </tr>
   779           <tr>
   780             <td>
   781               <em>Initial:</em>
   782             </td>
   783             <td>
   784               see individual properties
   785             </td>
   786           </tr>
   787           <tr>
   788             <td>
   789               <em>Applies to:</em>
   790             </td>
   791             <td>
   792               all elements, :before and :after pseudo elements
   793             </td>
   794           </tr>
   795           <tr>
   796             <td>
   797               <em>Inherited:</em>
   798             </td>
   799             <td>
   800               no
   801             </td>
   802           </tr>
   803           <tr>
   804             <td>
   805               <em>Animatable:</em>
   806             </td>
   807             <td>
   808               no
   809             </td>
   810           </tr>
   811           <tr>
   812             <td>
   813               <em>Percentages:</em>
   814             </td>
   815             <td>
   816               N/A
   817             </td>
   818           </tr>
   819           <tr>
   820             <td>
   821               <em>Media:</em>
   822             </td>
   823             <td>
   824               interactive
   825             </td>
   826           </tr>
   827           <tr>
   828             <td>
   829               <em>Computed value:</em>
   830             </td>
   831             <td>
   832               see individual properties
   833             </td>
   834           </tr>
   835           <tr>
   836             <td>
   837               <em>Canonical order:</em>
   838             </td>
   839             <td>
   840               <abbr title="follows order of property value definition">per grammar</abbr>
   841             </td>
   842           </tr>
   843         </tbody>
   844       </table>
   846       <div class="prod">
   847         <dfn id="single-transition">&lt;single-transition&gt;</dfn> = [ none | <span>&lt;single-transition-property&gt;</span> ] || <span>&lt;time&gt;</span> || <span>&lt;single-transition-timing-function&gt;</span> || <span>&lt;time&gt;</span>
   848       </div>
   850       <p>
   851         Note that order is important within the items in this property:
   852         the first value that can be parsed as a time is assigned to the
   853         transition-duration,
   854         and the second value that can be parsed as a time is assigned to
   855         transition-delay.
   856       </p>
   858       <p>
   859         If there is more than one <span>&lt;single-transition&gt;</span> in the shorthand,
   860         and any of the transitions has
   861         ''none'' as the <span>&lt;single-transition-property&gt;</span>,
   862         then the declaration is invalid.
   863       </p>
   865       <h2 id="starting">
   866         Starting of transitions
   867       </h2>
   869       <p>
   870         When the computed value of an animatable property changes,
   871         implementations must decide what transitions to start based on
   872         the values of the 'transition-property', 'transition-duration',
   873         'transition-timing-function', and 'transition-delay' properties
   874         at the time the animatable property would first have its new
   875         computed value.
   876         This means that when one of these 'transition-*' properties
   877         changes at the same time as
   878         a property whose change might transition,
   879         it is the <em>new</em> values of the 'transition-*' properties
   880         that control the transition.
   881       </p>
   882       <div class="example" id="manual-reversing-example">
   883         <p style="display:none">
   884           Example(s):
   885         </p>
   886         <p>This provides a way for authors to specify different values
   887         of the 'transition-*' properties for the &ldquo;forward&rdquo;
   888         and &ldquo;reverse&rdquo; transitions (but see <a
   889         href="#reversing">below</a> for special reversing behavior when
   890         an <em>incomplete</em> transition is interrupted).  Authors can
   891         specify the value of 'transition-duration',
   892         'transition-timing-function', or 'transition-delay' in the same
   893         rule where they specify the value that triggers the transition,
   894         or can change these properties at the same time as they change
   895         the property that triggers the transition.  Since it's the new
   896         values of these 'transition-*' properties that affect the
   897         transition, these values will be used for the transitions
   898         <em>to</em> the associated transitioning values.  For example:
   899          </p>
   900         <pre>li {
   901   transition: background-color linear 1s;
   902   background: blue;
   903 }
   904 li:hover {
   905   background-color: green;
   906   transition-duration: 2s; /* applies to the transition *to* the :hover state */
   907 }</pre>
   908         <p>
   909           When a list item with these style rules enters the :hover
   910           state, the computed 'transition-duration' at the time that
   911           'background-color' would have its new value (''green'') is ''2s'',
   912           so the transition from 'blue' to 'green' takes 2 seconds.
   913           However, when the list item leaves the :hover state, the
   914           transition from ''green'' to ''blue'' takes 1 second.
   915         </p>
   916       </div>
   918       <p>
   919         When the computed value of a property changes, implementations
   920         must start transitions based on the relevant item (see <a
   921         href="#transition-property">the definition of
   922         'transition-property'</a>) in the computed value of
   923         'transition-property'.
   924         Corresponding to this item there are
   925         computed values of 'transition-duration' and 'transition-delay'
   926         (see <a href="#list-matching">the rules on matching lists</a>).
   927         Define the <dfn>combined duration</dfn> of the transition
   928         as the sum of max('transition-duration', ''0s'') and 'transition-delay'.
   929         When the combined duration is greater than ''0s'',
   930         then a transition starts based on the values of
   931         'transition-duration', 'transition-delay',
   932         and 'transition-timing-function';
   933         in other cases transitions do not occur.
   934       </p>
   936       <p>
   937         Since this specification does not define
   938         when computed values change, and thus what changes to
   939         computed values are considered simultaneous,
   940         authors should be aware that changing any of the transition
   941         properties a small amount of time after making a change that
   942         might transition can result in behavior that varies between
   943         implementations, since the changes might be considered
   944         simultaneous in some implementations but not others.
   945       </p>
   947       <p>
   948         Once the transition of a property has started, it must continue
   949         running based on the original timing function, duration, and
   950         delay, even if the 'transition-timing-function',
   951         'transition-duration', or 'transition-delay' property changes
   952         before the transition is complete.  However, if the
   953         'transition-property' property changes such that the transition
   954         would not have started, the transition must stop (and the
   955         property must immediately change to its final value).
   956       </p>
   958       <p>
   959         Implementations must not start a transition when the computed
   960         value of a property changes as a result of declarative animation
   961         (as opposed to scripted animation).
   962       </p>
   964       <p>
   965         Implementations also must not start a transition when the
   966         computed value changes because it is inherited (directly or
   967         indirectly) from another element that is transitioning the same
   968         property.
   969       </p>
   971       <h2 id="reversing">
   972         Automatically reversing interrupted transitions
   973       </h2>
   974       <p>
   975         A common type of transition effect is when a running transition is
   976         interrupted and the property is reset to its original value. An
   977         example is a hover effect on an element, where the pointer enters and
   978         exits the element before the effect has completed. If the outgoing and
   979         incoming transitions are executed using their specified durations and
   980         timing functions, the resulting effect can be distractingly
   981         asymmetric. Instead, the expected behavior is that the new transition
   982         should be the reverse of what has already executed.
   983       </p>
   985       <p>
   986         If a running transition with duration T, executing so far for duration TE, 
   987         from state A, to state B, is interrupted by
   988         a property change that would start a new transition back to state A, and
   989         all the transition attributes are the same (duration, delay and timing function),
   990         then the new transition must reverse the effect. The new transition must:
   991       </p>
   993       <ol>
   994         <li>
   995           Use the B and A states as its "from" and "to" states respectively. It
   996           does not use the current value as its from state, due to the rules below.
   997         </li>
   998         <li>
   999           Execute with the same duration T, but starting as if the transition had
  1000           already begun, without any transition delay, at the moment which would
  1001           cause the new transition to finish in TE from the moment of interruption. In other
  1002           words, the new transition will execute as if it started T-TE in the past.
  1003         </li>
  1004         <li>
  1005           Use a timing function that is the portion of the curve traversed up
  1006           to the moment of interruption, followed in the opposite direction (towards
  1007           the starting point). This will make the transition appear as if it 
  1008           is playing backwards.
  1009         </li>
  1010         <li>
  1011           Ignore any transition delay.
  1012         </li>
  1013       </ol>
  1015       <p>
  1016         For example, suppose there is a transition with a duration of two
  1017         seconds. If this transition is interrupted after 0.5 seconds and the
  1018         property value assigned to the original value, then the new transition
  1019         effect will be the reverse of the original, as if it had begun
  1020         1.5 seconds in the past.
  1021       </p>
  1023       <p>
  1024         Note that by using the defined from and to states for the reversing
  1025         transition, it is also possible that it may reverse again, if
  1026         interrupted; for example, if the transition reversing to state A was
  1027         again interrupted by a property change to state B.
  1028       </p>
  1030       <p class="issue">Issue:
  1031         This introduces the concept of reversing a timing function,
  1032         which the spec has otherwise resisted doing, and also introduces
  1033         a discontinuity between transitions that have
  1034         almost completed (which get automatically reversed and thus have
  1035         their timing function reversed) and transitions that have fully
  1036         completed (where the reversal doesn't lead to the timing
  1037         function being reversed).  An alternative proposal that avoids
  1038         this is to follow the normal timing function algorithm, except
  1039         multiply the duration (and also shorten any negative delay) by
  1040         the (output) value of the transition timing function of the
  1041         incomplete transition at the time it was interrupted, and, to
  1042         account for multiple reverses in sequence, to divide by the
  1043         shortening applied to the transition being interrupted.  For
  1044         more details see this thread:
  1045         <a href="http://lists.w3.org/Archives/Public/www-style/2009Nov/thread.html#msg302">November 2009 part</a>,
  1046         <a href="http://lists.w3.org/Archives/Public/www-style/2009Dec/thread.html#msg319">December 2009 part</a>,
  1047         <a href="http://lists.w3.org/Archives/Public/www-style/2010Jan/thread.html#msg136">January 2010 part</a>.
  1048       </p>
  1050       <h2 id="transition-events"><a id="transition-events-">
  1051         Transition Events
  1052       </a></h2>
  1053       <p>
  1054         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>.
  1055         An event is fired for each property that undergoes a transition.
  1056         This allows a content developer to perform actions that synchronize
  1057         with the completion of a transition.
  1058       </p>
  1059       <p>
  1060         Each event provides the name of the property the transition is
  1061         associated with as well as the duration of the transition.
  1062       </p>
  1063       <dl>
  1064         <dt>
  1065           <b>Interface <dfn id="Events-TransitionEvent">TransitionEvent</dfn></b>
  1066         </dt>
  1067         <dd>
  1068           <p>
  1069             The <code>TransitionEvent</code> interface provides specific contextual information associated with transitions.
  1070           </p>
  1071           <dl>
  1072             <dt>
  1073               <b>IDL Definition</b>
  1074             </dt>
  1075             <dd>
  1076               <div class='idl-code'>
  1077                 <pre>
  1078   <span id="TransitionEvent">[Constructor(DOMString <var title="">type</var>, optional <i>TransitionEventInit</i> <var title="">transitionEventInitDict</var>)]
  1079   interface TransitionEvent</span> : Event {
  1080     readonly attribute DOMString          <a href="#Events-TransitionEvent-propertyName">propertyName</a>;
  1081     readonly attribute float              <a href="#Events-TransitionEvent-elapsedTime">elapsedTime</a>;
  1082     readonly attribute DOMString          <a href="#Events-TransitionEvent-pseudoElement">pseudoElement</a>;
  1083   };
  1085   dictionary <dfn id="TransitionEventInit">TransitionEventInit</dfn> : <a class="external" href="http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#eventinit">EventInit</a> {
  1086     DOMString <a href="#Events-TransitionEvent-propertyName">propertyName</a>;
  1087     float <a href="#Events-TransitionEvent-elapsedTime">elapsedTime</a>;
  1088     DOMString <a href="#Events-TransitionEvent-pseudoElement">pseudoElement</a>;
  1090   </pre>
  1091               </div>
  1092             </dd>
  1093             <dt>
  1094               <b>Attributes</b>
  1095             </dt>
  1096             <dd>
  1097               <dl>
  1098                 <dt>
  1099                   <code class='attribute-name'><dfn title="TransitionEvent::propertyName" id="Events-TransitionEvent-propertyName">propertyName</dfn></code> of type <code>DOMString</code>, readonly
  1100                 </dt>
  1101                 <dd>
  1102                   The name of the CSS property associated with the transition.
  1103                   When an event is created the attribute
  1104                   must be initialized to the empty string.
  1105                 </dd>
  1106               </dl>
  1107               <dl>
  1108                 <dt>
  1109                   <code class='attribute-name'><dfn title="TransitionEvent::elapsedTime" id="Events-TransitionEvent-elapsedTime">elapsedTime</dfn></code> of type <code>float</code>, readonly
  1110                 </dt>
  1111                 <dd>
  1112                   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>.
  1113                   When an event is created the attribute
  1114                   must be initialized to zero.
  1115                 </dd>
  1116               </dl>
  1117               <dl>
  1118                 <dt>
  1119                   <code class='attribute-name'><dfn title="TransitionEvent::pseudoElement" id="Events-TransitionEvent-pseudoElement">pseudoElement</dfn></code> of type <code>DOMString</code>, readonly
  1120                 </dt>
  1121                 <dd>
  1122                   The name (beginning with two colons) of the CSS
  1123                   pseudo-element on which the transition occured (in
  1124                   which case the target of the event is that
  1125                   pseudo-element's corresponding element), or the empty
  1126                   string if the transition occurred on an element (which
  1127                   means the target of the event is that element).
  1128                   When an event is created the attribute
  1129                   must be initialized to the empty string.
  1130                 </dd>
  1131               </dl>
  1132             </dd>
  1133           </dl>
  1134           <p>
  1135             <code id="TransitionEvent-constructor">TransitionEvent(type, transitionEventInitDict)</code>
  1136             is an <a class="external" href="http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#constructing-events">event constructor</a>.
  1137           </p>
  1138         </dd>
  1139       </dl>
  1140       <p>
  1141         There is one type of transition event available.
  1142       </p>
  1143       <dl>
  1144         <dt>
  1145           <b><dfn>transitionend</dfn></b>
  1146         </dt>
  1147         <dd>
  1148           The <code>transitionend</code> event occurs at the completion of the transition. In the
  1149           case where a transition is removed before completion, such as if the
  1150           transition-property is removed, then the event will not fire.
  1151           <ul>
  1152             <li>Bubbles: Yes
  1153             </li>
  1154             <li>Cancelable: Yes
  1155             </li>
  1156             <li>Context Info: propertyName, elapsedTime, pseudoElement
  1157             </li>
  1158           </ul>
  1159         </dd>
  1160       </dl>
  1162       <h2 id="animatable-types"><a id="animation-of-property-types-">
  1163         Animation of property types
  1164       </a></h2>
  1166       <p>
  1167         When interpolating between two values,
  1168         <i>V</i><sub>start</sub> and <i>V</i><sub>end</sub>,
  1169         interpolation is done using the output <i>p</i> of the timing function,
  1170         which gives the portion of the value space
  1171         that the interpolation has crossed.
  1172         Thus the result of the interpolation is
  1173         <i>V</i><sub>res</sub> =
  1174           (1 - <i>p</i>) &sdot; <i>V</i><sub>start</sub> +
  1175           <i>p</i> &sdot; <i>V</i><sub>end</sub>.
  1176       </p>
  1178       <p>
  1179         However, if this value (<i>V</i><sub>res</sub>)
  1180         is outside the allowed range of values for the property,
  1181         then it is clamped to that range.
  1182         This can occur if <i>p</i> is outside of the range 0 to 1,
  1183         which can occur if a timing function is specified
  1184         with a <i>y1</i> or <i>y2</i> that is outside the range 0 to 1.
  1185       </p>
  1187       <p>
  1188         The following describes how each property type undergoes transition or
  1189         animation.
  1190       </p>
  1192       <ul>
  1193         <li id="animtype-color">
  1194           <strong>color</strong>: interpolated via red, green, blue and alpha
  1195           components (treating each as a number, see below).
  1196           The interpolation is done between premultiplied colors
  1197           (that is, colors for which the red, green, and blue components
  1198           specified have been multiplied by the alpha).
  1199         </li>
  1200         <li id="animtype-length">
  1201           <strong>length</strong>: interpolated as real numbers.
  1202         </li>
  1203         <li id="animtype-percentage">
  1204           <strong>percentage</strong>: interpolated as real numbers.
  1205         </li>
  1206         <li id="animtype-lpcalc">
  1207           <strong>length, percentage, or calc</strong>: when both values
  1208           are lengths, interpolated as lengths; when both values are
  1209           percentages, interpolated as percentages; otherwise, both
  1210           values are converted into a ''calc()'' function that is the
  1211           sum of a length and a percentage (each possibly zero), and
  1212           these ''calc()'' functions have each half interpolated as real
  1213           numbers.
  1214         </li>
  1215         <li id="animtype-integer">
  1216           <strong>integer</strong>: interpolated via discrete steps (whole
  1217           numbers). The interpolation happens in real number space and is
  1218           converted to an integer by rounding to the nearest integer, with
  1219           values halfway between a pair of integers rounded towards
  1220           positive infinity.
  1221         </li>
  1222         <li id="animtype-font-weight">
  1223           <strong>font weight</strong>: interpolated via discrete steps
  1224           (multiples of 100). The interpolation happens in real number
  1225           space and is converted to an integer by rounding to the
  1226           nearest multiple of 100, with values halfway between multiples
  1227           of 100 rounded towards positive infinity.
  1228         </li>
  1229         <li id="animtype-number">
  1230           <strong>number</strong>: interpolated as real (floating point)
  1231           numbers.
  1232         </li>
  1233         <li id="animtype-rect">
  1234           <strong>rectangle</strong>: interpolated via the x, y,
  1235           width and height components (treating each as a number).
  1236         </li>
  1237         <li id="animtype-visibility">
  1238           <strong>visibility</strong>: if one of the values is
  1239           ''visible'', interpolated as a discrete step where values of the
  1240           timing function between 0 and 1 map to ''visible'' and other
  1241           values of the timing function (which occur only at the
  1242           start/end of the transition or as a result of ''cubic-bezier()''
  1243           functions with Y values outside of [0, 1]) map to the closer
  1244           endpoint; if neither value is ''visible'' then not interpolable.
  1245         </li>
  1246         <li id="animtype-shadow-list">
  1247           <strong>shadow list</strong>: Each shadow in the list is
  1248           interpolated via the
  1249           color (as <a href="#animtype-color">color</a>) component,
  1250           and x, y, blur, and (when appropriate) spread
  1251           (as <a href="#animtype-length">length</a>) components.
  1252           For each shadow, if one input shadow is ''inset'' and the other
  1253           is not, then the result for that shadow matches the inputs;
  1254           otherwise the entire list is not interpolable.
  1255           If the lists of shadows have different lengths,
  1256           then the shorter list is padded at the end
  1257           with shadows whose color is ''transparent'',
  1258           all lengths are ''0'',
  1259           and whose ''inset'' (or not) matches the longer list.
  1260         </li>
  1261         <li id="animtype-gradient">
  1262           <strong>gradient</strong>: interpolated via the
  1263           positions and colors of each stop. They must have the same type
  1264           (radial or linear) and same number of stops in order to be animated.
  1265           <span class="note">Note: [[CSS3-IMAGES]] may extend this
  1266           definition.</span>
  1267         </li>
  1268         <li id="animtype-paintserver">
  1269           <strong>paint server</strong> (SVG): interpolation is only supported
  1270           between: gradient to gradient and color to color. They then
  1271           work as above.
  1272         </li>
  1273         <li id="animtype-simple-list">
  1274           <strong>simple list</strong> of other types:
  1275           If the lists have the same number of items,
  1276           and each pair of values can be interpolated,
  1277           each item in the list is interpolated using
  1278           the rules given for those types.
  1279           Otherwise the values are not interpolable.
  1280         </li>
  1281         <li id="animtype-repeatable-list">
  1282           <strong>repeatable list</strong> of other types:
  1283           The result list has a length that is the least common multiple
  1284           of the lengths of the input lists.
  1285           Each item in the result is the interpolation of the value
  1286           from each input list repeated to the length of the result list.
  1287           If a pair of values cannot be interpolated, then the lists
  1288           are not interpolable.
  1289           <span class="note">
  1290             The repeatable list concept ensures that a list that is
  1291             conceptually repeated to a certain length (as
  1292             'background-origin' is repeated to the length of the
  1293             'background-image' list) or repeated infinitely will
  1294             smoothly transition between any values, and so that the
  1295             computed value will properly represent the result (and
  1296             potentially be inherited correctly).
  1297           </span>
  1298         </li>
  1299       </ul>
  1301       <p>Future specifications may define additional types that can
  1302       be animated.</p>
  1304       <p>See the definition of 'transition-property' for how animation
  1305       of shorthand properties and the ''all'' value is applied to any
  1306       properties (in the shorthand) that can be animated.</p>
  1308       <h2 id="animatable-properties"><a id="animatable-properties-">
  1309         Animatable properties
  1310       </a></h2>
  1312       <!--
  1313       As resolved in
  1314       http://lists.w3.org/Archives/Public/www-style/2011Sep/0497.html
  1315       -->
  1317       <p>The definition of each CSS property defines
  1318       when the values of that property can be interpolated
  1319       by referring to the definitions of property types
  1320       in the <a href="#animatable-types">previous section</a>.
  1321       Values are animatable when
  1322       both the from and the to values of the property have the type described.
  1323       (When a composite type such as "length, percentage, or calc" is listed,
  1324       this means that both values must fit into that composite type.)
  1325       When multiple types are listed in the form "either A or B",
  1326       both values must be of the same type to be interpolable.</p>
  1328       <p>For properties that exist at the time this specification was
  1329       developed, this specification defines whether and how they are
  1330       animated.  However, future CSS specifications may define
  1331       additional properties, additional values for existing properties,
  1332       or additional animation behavior of existing values.  In order to
  1333       describe new animation behaviors and to have the definition of
  1334       animation behavior in a more appropriate location, future CSS
  1335       specifications should include an "Animatable:" line in the summary
  1336       of the property's definition (in addition to the other lines
  1337       described in [[CSS21]], <a
  1338       href="http://www.w3.org/TR/CSS21/about.html#property-defs">section
  1339       1.4.2</a>).  This line should say "no" to indicate that a property
  1340       cannot be animated or should reference an animation behavior
  1341       (which may be one of the behaviors in the <a
  1342       href="#animation-of-property-types-">Animation of property
  1343       types</a> section above, or may be a new behavior) to define how
  1344       the property animates.  Such definitions override those given in
  1345       this specification.</p>
  1347       <h3 id="animatable-css"><a id="properties-from-css-">
  1348         Properties from CSS
  1349       </a></h3>
  1351       <p>
  1352       The following definitions define the animation behavior for
  1353       properties in CSS Level 2 Revision 1 ([[CSS21]]) and in Level 3 of
  1354       the CSS Color Module ([[CSS3COLOR]]).
  1355       </p>
  1357      <table class="animatable-properties">
  1358        <tr>
  1359          <th>Property Name</th>
  1360          <th>Type</th>
  1361        </tr>
  1362        <tr>
  1363          <td>background-color</td><td>as <a href="#animtype-color">color</a></tr>
  1364        <tr>
  1365          <td>background-position</td><td>as <a href="#animtype-repeatable-list">repeatable list</a> of <a href="#animtype-simple-list">simple list</a> of <a href="#animtype-lpcalc">length, percentage, or calc</a></td>
  1366        </tr>
  1367        <tr>
  1368          <td>border-bottom-color</td><td>as <a href="#animtype-color">color</a></td>
  1369        </tr>
  1370        <tr>
  1371          <td>border-bottom-width</td><td>as <a href="#animtype-length">length</a></td>
  1372        </tr>
  1373        <tr>
  1374          <td>border-left-color</td><td>as <a href="#animtype-color">color</a></td>
  1375        </tr>
  1376        <tr>
  1377          <td>border-left-width</td><td>as <a href="#animtype-length">length</a></td>
  1378        </tr>
  1379        <tr>
  1380          <td>border-right-color</td><td>as <a href="#animtype-color">color</a></td>
  1381        </tr>
  1382        <tr>
  1383          <td>border-right-width</td><td>as <a href="#animtype-length">length</a></td>
  1384        </tr>
  1385        <tr>
  1386          <td>border-spacing</td><td>as <a href="#animtype-simple-list">simple list</a> of <a href="#animtype-length">length</a></td>
  1387        </tr>
  1388        <tr>
  1389          <td>border-top-color</td><td>as <a href="#animtype-color">color</a></td>
  1390        </tr>
  1391        <tr>
  1392          <td>border-top-width</td><td>as <a href="#animtype-length">length</a></td>
  1393        </tr>
  1394        <tr>
  1395          <td>bottom</td><td>as <a href="#animtype-lpcalc">length, percentage, or calc</a></td>
  1396        </tr>
  1397        <tr>
  1398          <td>clip</td><td>as <a href="#animtype-rect">rectangle</a></td>
  1399        </tr>
  1400        <tr>
  1401          <td>color</td><td>as <a href="#animtype-color">color</a></td>
  1402        </tr>
  1403        <tr>
  1404          <td>font-size</td><td>as <a href="#animtype-length">length</a></td>
  1405        </tr>
  1406        <tr>
  1407          <td>font-weight</td><td>as <a href="#animtype-font-weight">font weight</a></td>
  1408        </tr>
  1409        <tr>
  1410          <td>height</td><td>as <a href="#animtype-lpcalc">length, percentage, or calc</a></td>
  1411        </tr>
  1412        <tr>
  1413          <td>left</td><td>as <a href="#animtype-lpcalc">length, percentage, or calc</a></td>
  1414        </tr>
  1415        <tr>
  1416          <td>letter-spacing</td><td>as <a href="#animtype-length">length</a></td>
  1417        </tr>
  1418        <tr>
  1419          <td>line-height</td><td>as either <a href="#animtype-number">number</a> or <a href="#animtype-length">length</a></td>
  1420        </tr>
  1421        <tr>
  1422          <td>margin-bottom</td><td>as <a href="#animtype-length">length</a></td>
  1423        </tr>
  1424        <tr>
  1425          <td>margin-left</td><td>as <a href="#animtype-length">length</a></td>
  1426        </tr>
  1427        <tr>
  1428          <td>margin-right</td><td>as <a href="#animtype-length">length</a></td>
  1429        </tr>
  1430        <tr>
  1431          <td>margin-top</td><td>as <a href="#animtype-length">length</a></td>
  1432        </tr>
  1433        <tr>
  1434          <td>max-height</td><td>as <a href="#animtype-lpcalc">length, percentage, or calc</a></td>
  1435        </tr>
  1436        <tr>
  1437          <td>max-width</td><td>as <a href="#animtype-lpcalc">length, percentage, or calc</a></td>
  1438        </tr>
  1439        <tr>
  1440          <td>min-height</td><td>as <a href="#animtype-lpcalc">length, percentage, or calc</a></td>
  1441        </tr>
  1442        <tr>
  1443          <td>min-width</td><td>as <a href="#animtype-lpcalc">length, percentage, or calc</a></td>
  1444        </tr>
  1445        <tr>
  1446          <td>opacity</td><td>as <a href="#animtype-number">number</a></td>
  1447        </tr>
  1448        <tr>
  1449          <td>outline-color</td><td>as <a href="#animtype-color">color</a></td>
  1450        </tr>
  1451        <tr>
  1452          <td>outline-width</td><td>as <a href="#animtype-length">length</a></td>
  1453        </tr>
  1454        <tr>
  1455          <td>padding-bottom</td><td>as <a href="#animtype-length">length</a></td>
  1456        </tr>
  1457        <tr>
  1458          <td>padding-left</td><td>as <a href="#animtype-length">length</a></td>
  1459        </tr>
  1460        <tr>
  1461          <td>padding-right</td><td>as <a href="#animtype-length">length</a></td>
  1462        </tr>
  1463        <tr>
  1464          <td>padding-top</td><td>as <a href="#animtype-length">length</a></td>
  1465        </tr>
  1466        <tr>
  1467          <td>right</td><td>as <a href="#animtype-lpcalc">length, percentage, or calc</a></td>
  1468        </tr>
  1469        <tr>
  1470          <td>text-indent</td><td>as <a href="#animtype-lpcalc">length, percentage, or calc</a></td>
  1471        </tr>
  1472        <tr>
  1473          <td>text-shadow</td><td>as <a href="#animtype-shadow-list">shadow list</a></td>
  1474        </tr>
  1475        <tr>
  1476          <td>top</td><td>as <a href="#animtype-lpcalc">length, percentage, or calc</a></td>
  1477        </tr>
  1478        <tr>
  1479          <td>vertical-align</td><td>as <a href="#animtype-length">length</a></td>
  1480        </tr>
  1481        <tr>
  1482          <td>visibility</td><td>as <a href="#animtype-visibility">visibility</a></td>
  1483        </tr>
  1484        <tr>
  1485          <td>width</td><td>as <a href="#animtype-lpcalc">length, percentage, or calc</a></td>
  1486        </tr>
  1487        <tr>
  1488          <td>word-spacing</td><td>as <a href="#animtype-length">length</a></td>
  1489        </tr>
  1490        <tr>
  1491          <td>z-index</td><td>as <a href="#animtype-integer">integer</a></td>
  1492        </tr>
  1493      </table>
  1495      <h3 id="animatable-svg"><a id="properties-from-svg-">
  1496        Properties from SVG
  1497      </a></h3>
  1499      <p>
  1500        All properties defined as animatable in the SVG specification, provided
  1501        they are one of the property types listed above.
  1502       </p>
  1504      <!-- <table>
  1505        <tr>
  1506          <th>Property Name</th><th>Type</th>
  1507        </tr>
  1508        <tr>
  1509          <td>stop-color</td><td>as <a href="#animtype-color">color</a></td>
  1510        </tr>
  1511        <tr>
  1512          <td>stop-opacity</td><td>as <a href="#animtype-number">number</a></td>
  1513        </tr>
  1514        <tr>
  1515          <td>fill</td><td>as <a href="#animtype-paintserver">paint server</a></td>
  1516        </tr>
  1517        <tr>
  1518          <td>fill-opacity</td><td>as <a href="#animtype-number">number</a></td>
  1519        </tr>
  1520        <tr>
  1521          <td>stroke</td><td>as <a href="#animtype-paintserver">paint server</a></td>
  1522        </tr>
  1523        <tr>
  1524          <td>stroke-dasharray</td><td>as <a href="#animtype-repeatable-list">repeatable list</a> of <a href="#animtype-number">number</a></td>
  1525        </tr>
  1526        <tr>
  1527          <td>stroke-dashoffset</td><td>as <a href="#animtype-number">number</a></td>
  1528        </tr>
  1529        <tr>
  1530          <td>stroke-miterlimit</td><td>as <a href="#animtype-number">number</a></td>
  1531        </tr>
  1532        <tr>
  1533          <td>stroke-opacity</td><td>as <a href="#animtype-number">number</a></td>
  1534        </tr>
  1535        <tr>
  1536          <td>stroke-width</td><td>as <a href="#animtype-number">number</a></td>
  1537        </tr>
  1538        <tr>
  1539          <td>viewport-fill</td><td>as <a href="#animtype-color">color</a></td>
  1540        </tr>
  1541        <tr>
  1542          <td>viewport-fill-opacity</td><td>as <a href="#animtype-color">color</a></td>
  1543        </tr>
  1544       </table> -->
  1546 <h2 id="acknowledgments">Acknowledgments</h2>
  1548 <p>Thanks especially to the feedback from
  1549 Tab Atkins,
  1550 Carine Bournez,
  1551 Aryeh Gregor,
  1552 Vincent Hardy,
  1553 Cameron McCormack,
  1554 Alex Mogilevsky,
  1555 and all the rest of the
  1556 <a href="http://lists.w3.org/Archives/Public/www-style/">www-style</a> community.</p>
  1558 <h2 id="references">References</h2>
  1560 <h3 class="no-num" id="normative-references">Normative references</h3>
  1561 <!--normative-->
  1563 <h3 class="no-num" id="other-references">Other references</h3>
  1564 <!--informative-->
  1568 <h2 class="no-num" id="property-index">Property index</h2>
  1569 <!-- properties -->
  1573 <h2 class="no-num" id="index">Index</h2>
  1574 <!--index-->
  1576 </body>
  1577 </html>
  1578 <!-- Keep this comment at the end of the file
  1579 Local variables:
  1580 mode: sgml
  1581 sgml-default-doctype-name:"html"
  1582 sgml-minimize-attributes:t
  1583 End:
  1584 -->

mercurial