Wed, 08 Feb 2012 13:59:13 +0000
2012-02-08 simon.fraser@apple.com
Fix https://www.w3.org/Bugs/Public/show_bug.cgi?id=14797 - make Animation events non-cancelable.
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 Animations</title>
7 <link rel="stylesheet" type="text/css" href="../default.css">
8 <link rel="stylesheet" type="text/css" href="http://www.w3.org/StyleSheets/TR/W3C-ED.css">
9 </head>
11 <body>
13 <div class="head">
14 <!--logo-->
16 <h1>CSS Animations</h1>
18 <h2 class="no-num no-toc">[LONGSTATUS] [DATE]</h2>
19 <dl>
20 <dt>This version:
21 <dd><a href="[VERSION]">http://dev.w3.org/csswg/css3-animations/</a>
22 <!--http://www.w3.org/TR/[YEAR]/WD-[SHORTNAME]-[CDATE]-->
23 <dt>Latest version:
24 <dd><a
25 href="http://www.w3.org/TR/css3-animations">[LATEST]</a>
26 <dt>Editor's draft:
27 <dd><a href="http://dev.w3.org/csswg/[SHORTNAME]/">http://dev.w3.org/csswg/[SHORTNAME]/</a>
29 <dt>Previous version:
30 <dd><a href="http://www.w3.org/TR/2009/WD-css3-animations-20090320/">
31 http://www.w3.org/TR/2009/WD-css3-animations-20090320/</a>
32 <dt id="editors-list">Editors:
33 <dd><a href="mailto:dino@apple.com">Dean Jackson</a> (<a
34 href="http://www.apple.com/">Apple Inc</a>)
35 <dd><a href="mailto:hyatt@apple.com">David Hyatt</a> (<a
36 href="http://www.apple.com/">Apple Inc</a>)
37 <dd><a href="mailto:cmarrin@apple.com">Chris Marrin</a> (<a
38 href="http://www.apple.com/">Apple Inc</a>)
39 <dd><a href="mailto:sylvaing@microsoft.com">Sylvain Galineau</a>
40 (<a class=org href="http://www.microsoft.com/">Microsoft</a>)
41 <dd class=vcard><a class=fn href="http://dbaron.org/">L. David Baron</a>
42 (<a class=org href="http://www.mozilla.org/">Mozilla</a>)
44 <dt>Issues list:
45 <dd>none yet
47 <dt>Test suite:
48 <dd>none yet
49 </dl>
51 <!--copyright-->
53 <hr title="Separator for header">
54 </div>
56 <h2 class="no-num no-toc" id="abstract">Abstract</h2>
58 <p>This CSS module describes a way for authors to animate the values of CSS properties over time, using keyframes.
59 The behavior of these keyframe animations can be controlled by specifying their duration, number of repeats,
60 and repeating behavior.
61 </p>
63 <h2 class="no-num no-toc" id="status">Status of this document</h2>
64 <!--status-->
67 <h2 class="no-num no-toc" id="contents">Table of contents</h2>
68 <!--toc-->
71 <h2 id="introduction">Introduction</h2>
73 <p><em>This section is not normative.</em>
75 <p>
76 CSS Transitions [[!CSS3-TRANSITIONS]] provide a way to interpolate CSS property values
77 when they change as a result of underlying property changes. This provides an easy way to do simple animation,
78 but the start and end states of the animation are controlled by the existing property values,
79 and transitions provide little control to the author on how the animation progresses.
80 </p>
81 <p>
82 This proposal introduces <em>defined animations</em>, in which the author can
83 specify the changes in CSS properties over time as a set of keyframes. Animations are similar to transitions
84 in that they change the presentational value of CSS properties over time.
85 The principal difference is that while transitions trigger <i>implicitly</i> when property values change, animations
86 are <i>explicitly</i> executed when the animation properties are applied. Because of this, animations require explicit
87 values for the properties being animated. These values are specified using animation keyframes, described below.
88 </p>
89 <p>
90 Many aspects of the animation can be controlled, including how many times the animation iterates, whether or not
91 it alternates between the begin and end values, and whether or not the animation should be running or paused.
92 An animation can also delay its start time.
93 </p>
95 <h2>Animations</h2>
97 <p>
98 CSS Animations affect computed property values. During the execution of an animation, the
99 computed value for a property is controlled by the animation. This overrides the value
100 specified in the normal styling system.
101 </p>
103 <p>
104 In the case of multiple animations specifying behavior for the same property, the animation
105 defined last will override the previously defined animations.
106 </p>
108 <p>
109 An animation does not affect the computed value before the application of the animation,
110 before the animation delay has expired, and after the end of the animation.
111 </p>
113 <div class="figure">
114 <img src="sandwich.png" alt="">
115 </div>
116 <p class="caption">
117 Computation of animated property values
118 </p>
120 <p>
121 The diagram above shows how property values are computed. The intrinsic style is shown at the
122 top of the diagram. The computed value is derived from intrinsic style at the times when an
123 animation is not running and also when an animation is delayed (see below for specification of
124 animation delay). During an animation, the computed style is derived from the animated value.
125 </p>
127 <p>
128 The start time of an animation is the latter of two moments: the time at which the style is
129 resolved that specifies the animation, or the time the document's load event is fired.
130 Therefore, an animation specified in the document stylesheet will begin at the document load.
131 An animation specified on an element by modifying the style after the document has loaded will
132 start when the style is resolved. That may be immediately in the case of a pseudo style rule
133 such as hover, or may be when the scripting engine returns control to the browser (in the case
134 of style applied by script).
135 </p>
137 <p>
138 An animation applies to an element if the element has a value for
139 <code class="property">'animation-name'</code> that references a valid
140 keyframes rule. Once an animation has started it continues until it ends
141 or the <code class="property">'animation-name'</code> is removed. The values
142 used for the keyframes and animation properties are snapshotted at the
143 time the animation starts. Changing them during the execution of the
144 animation has no effect. Note also, that changing the value of
145 <code class="property">'animation-name'</code> does not necessarily
146 restart an animation (e.g. if a list of animations are applied and
147 one is removed from the list, only that animation will stop; The other
148 animations will continue). In order to restart an animation, it must be
149 removed then reapplied.
150 </p>
152 <p>
153 The end of the animation is defined by the combination of the
154 <code class="property">'animation-duration'</code>,
155 <code class="property">'animation-iteration-count'</code> and
156 <code class="property">'animation-fill-mode'</code> properties.
157 </p>
159 <div class="example">
160 <p style="display:none">
161 Example(s):
162 </p>
163 <pre>
164 div {
165 animation-name: diagonal-slide;
166 animation-duration: 5s;
167 animation-iteration-count: 10;
168 }
170 @keyframes diagonal-slide {
172 from {
173 left: 0;
174 top: 0;
175 }
177 to {
178 left: 100px;
179 top: 100px;
180 }
182 }
184 </pre>This will produce an animation that moves an element from (0, 0) to (100px, 100px) over five seconds and repeats itself nine times (for a total of ten iterations).
185 </div>
187 <h2>Keyframes</h2>
188 <p>
189 Keyframes are used to specify the values for the animating properties at various points
190 during the animation. The keyframes specify the behavior of one cycle of the animation;
191 the animation may iterate one or more times.
192 </p>
193 <p>
194 Keyframes are specified using a specialized CSS at-rule. A <code
195 class="property">@keyframes</code> rule consists of the keyword
196 "@keyframes", followed by an identifier giving a name for the animation
197 (which will be referenced using <code class="property">'animation-name'</code>),
198 followed by a set of style rules (delimited by curly braces).
199 </p>
200 <p>
201 The <i>keyframe selector</i> for a keyframe style rule consists of a
202 comma-separated list of percentage values or the keywords 'from' or
203 'to'. The selector is used to specify the percentage along the duration
204 of the animation that the keyframe represents. The
205 keyframe itself is specified by the block of property values declared on
206 the selector. The keyword 'from' is equivalent to the value 0%. The
207 keyword 'to' is equivalent to the value 100%. Note that the percentage
208 unit specifier must be used on percentage values. Therefore, "0" is an
209 invalid keyframe selector.
210 </p>
211 <p>
212 If a 0% or "from" keyframe is not specified, then the user agent
213 constructs a 0% keyframe using the computed values of the properties
214 being animated. If a 100% or "to" keyframe is not specified, then the user agent
215 constructs a 100% keyframe using the computed values of the properties
216 being animated.
217 </p>
218 <p>
219 The <i>keyframe declaration</i> for a keyframe rule consists of
220 properties and values. Properties that are unable to be
221 animated are ignored in these rules, with the exception of <code
222 class="property">'animation-timing-function'</code>, the behavior
223 of which is described below.
224 </p>
225 <p class="note">
226 NOTE: describe what happens if a property is not present in all keyframes.
227 </p>
228 <p>
229 The @keyframes rule that is used by an animation will be the last one encountered in sorted rules order
230 that matches the name of the animation specified by the <code class="property">'animation-name'</code> property.
231 <code class="css">@keyframes</code> rules do not cascade;
232 therefore an animation will never derive keyframes from more than one <code class="css">@keyframes</code> rule.
233 </p>
234 <p>
235 To determine the set of keyframes, all of the values in the selectors are sorted in increasing order by time.
236 If there are any duplicates, then the last keyframe specified inside the <code class="css">@keyframes</code> rule
237 will be used to provide the keyframe information for that time. There is no cascading within a
238 <code class="css">@keyframes</code> rule if multiple keyframes specify the same keyframe selector values.
239 </p>
240 <p>
241 If property is not specified for a keyframe, or is specified but invalid, the animation of that property proceeds
242 as if that keyframe did not exist. Conceptually, it is as if a set of keyframes is constructed for each property
243 that is present in any of the keyframes, and an animation is run independently for each one.
244 </p>
245 <div class="example">
246 <p style="display:none">
247 Example(s):
248 </p>
249 <pre>
250 @keyframes wobble {
251 0% {
252 left: 100px;
253 }
255 40% {
256 left: 150px;
257 }
259 60% {
260 left: 75px;
261 }
263 100% {
264 left: 100px;
265 }
266 }
268 </pre>Four keyframes are specified for the animation named "wobble". In the first keyframe, shown at the beginning of the animation cycle, the 'left' value of the animation is 100px. By 40% of the animation duration, 'left' value has animated to 150px. At 60% of the animation duration, the 'left' value has animated back to 75px. At the end of the animation cycle, the 'left' value has returned to 100px. The diagram below shows the state of the animation if it were given a duration of 10s.
269 <div class="figure">
270 <img src="animation1.png" alt="">
271 </div>
272 <p class="caption">
273 Animations states specified by keyframes
274 </p>
275 </div>
277 <p>
278 The following is the grammar for the keyframes rule.
279 </p>
281 <pre>
283 keyframes-rule: KEYFRAMES_SYM S+ IDENT S* '{' S* keyframes-blocks '}' S*;
285 keyframes-blocks: [ keyframe-selector '{' S* declaration? [ ';' S* declaration? ]* '}' S* ]* ;
287 keyframe-selector: [ FROM_SYM | TO_SYM | PERCENTAGE ] S* [ ',' S* [ FROM_SYM | TO_SYM | PERCENTAGE ] S* ]*;
289 @{K}{E}{Y}{F}{R}{A}{M}{E}{S} {return KEYFRAMES_SYM;}
290 {F}{R}{O}{M} {return FROM_SYM;}
291 {T}{O} {return TO_SYM;}
292 </pre>
293 <!-- ======================================================================================================= -->
294 <h3>
295 Timing functions for keyframes
296 </h3>
297 <p>
298 A keyframe style rule may also declare the timing function that is to be used as the animation moves to the next keyframe.
299 </p>
300 <div class="example">
301 <p style="display:none">
302 Example(s):
303 </p>
304 <pre>
305 @keyframes bounce {
307 from {
308 top: 100px;
309 animation-timing-function: ease-out;
310 }
312 25% {
313 top: 50px;
314 animation-timing-function: ease-in;
315 }
317 50% {
318 top: 100px;
319 animation-timing-function: ease-out;
320 }
322 75% {
323 top: 75px;
324 animation-timing-function: ease-in;
325 }
327 to {
328 top: 100px;
329 }
331 }
333 </pre>Five keyframes are specified for the animation named "bounce". Between the first and second keyframe (ie. between 0% and 25%) an "ease-out" timing function is used. Between the second and third keyframe (ie. between 25% and 50%) an "ease-in" timing function is used. And so on. The effect will appear as an element that moves up the page 50px, slowing down as it reaches its highest point then speeding up as it falls back to 100px. The second half of the animation behaves in a similar manner, but only moves the element 25px units up the page. A timing function specified on the "to" or 100% keyframe is ignored
334 </div>
335 <p>
336 See <a href="#animation-timing-function_tag">the <code class="property">'animation-timing-function'</code>
337 property</a> for more information.
338 </p><!-- ======================================================================================================= -->
340 <!-- ======================================================================================================= -->
341 <h3>
342 The <code class="property">'animation-name'</code> Property
343 </h3>
344 <p>
345 The <code class="property">'animation-name'</code> property defines a
346 list of animations that apply. Each name is used to select the keyframe at-rule
347 that provides the property values for the animation. If the name does
348 not match any keyframe at-rule, there are no properties to be animated
349 and the animation will not execute. Furthermore, if the animation name
350 is 'none' then there will be no animation. This can be used to override
351 any animations coming from the cascade. If animations are attempting to
352 modify the same property, then the animation closest to the end of the
353 list of names wins.
354 </p>
355 <p>
356 Each animation listed by name should have a corresponding value
357 for the other animation properties listed below. In the case where the
358 other properties do not have lists of the correct length, their values
359 are repeated to form a list with the same number of entries as
360 <code class="property">'animation-name'</code>.
361 </p>
362 <table class="propdef">
363 <tbody>
364 <tr>
365 <td>
366 <em>Name:</em>
367 </td>
368 <td>
369 <dfn id="animation-name">animation-name</dfn>
370 </td>
371 </tr>
372 <tr>
373 <td>
374 <em>Value:</em>
375 </td>
376 <td>
377 none | IDENT [, none | IDENT ]*
378 </td>
379 </tr>
380 <tr>
381 <td>
382 <em>Initial:</em>
383 </td>
384 <td>
385 none
386 </td>
387 </tr>
388 <tr>
389 <td>
390 <em>Applies to:</em>
391 </td>
392 <td>
393 all elements, :before and :after pseudo elements
394 </td>
395 </tr>
396 <tr>
397 <td>
398 <em>Inherited:</em>
399 </td>
400 <td>
401 no
402 </td>
403 </tr>
404 <tr>
405 <td>
406 <em>Percentages:</em>
407 </td>
408 <td>
409 N/A
410 </td>
411 </tr>
412 <tr>
413 <td>
414 <em>Media:</em>
415 </td>
416 <td>
417 visual
418 </td>
419 </tr>
420 <tr>
421 <td>
422 <em>Computed value:</em>
423 </td>
424 <td>
425 Same as specified value.
426 </td>
427 </tr>
428 </tbody>
429 </table>
431 <!--
432 <p>
433 It is possible for elements to have multiple animations running that change the same property or properties. In this case the animations combine in a manner defined by the property. For example, animations on <code class="property">'opacity'</code> will add together and animations on <code class="property">'transform'</code> will have their transformation matrices multiplied.
434 </p>
435 <div class="example">
436 <p style="display:none">
437 Example(s):
438 </p>
439 <pre>
440 @keyframes 'border-bloat' {
441 from {
442 border-width: 0;
443 }
444 to {
445 border-width: 10px;
446 }
447 }
449 @keyframes 'border-diet' {
450 from {
451 border-width: 4px;
452 }
453 to {
454 border-width: 2px;
455 }
456 }
458 div {
459 animation-name: 'border-bloat', 'border-diet';
460 animation-duration: 10s, 4s;
461 }
462 </pre>
463 <p>
464 The above example has two animations executing on the same property, <code class="property">'border-width'</code>. The animations are additive. That is, the
465 resulting value for the property will be the addition of the values from the
466 two animations.
467 </p>
468 <p>
469 At time '0s' the element's border will be 4px wide (0px from 'border-bloat' plus 4px from 'border-diet').
470 At time '4s' the element's border will be 6px wide (4px from 'border-bloat' plus 2px from 'border-diet').
471 At time '10s' the element's border will be 10px wide (10px from 'border-bloat' and no addition from
472 'border-diet' as it is no longer executing).
473 </p>
474 </div>
475 -->
478 <!-- ======================================================================================================= -->
479 <h3>
480 The <code class="property">'animation-duration'</code> Property
481 </h3>
482 <p>
483 The <code class="property">'animation-duration'</code> property defines the length of time that an animation takes to complete one cycle.
484 </p>
485 <table class="propdef">
486 <tbody>
487 <tr>
488 <td>
489 <em>Name:</em>
490 </td>
491 <td>
492 <dfn id="animation-duration">animation-duration</dfn>
493 </td>
494 </tr>
495 <tr>
496 <td>
497 <em>Value:</em>
498 </td>
499 <td>
500 <time> [, <time>]*
501 </td>
502 </tr>
503 <tr>
504 <td>
505 <em>Initial:</em>
506 </td>
507 <td>
508 0s
509 </td>
510 </tr>
511 <tr>
512 <td>
513 <em>Applies to:</em>
514 </td>
515 <td>
516 all elements, :before and :after pseudo elements
517 </td>
518 </tr>
519 <tr>
520 <td>
521 <em>Inherited:</em>
522 </td>
523 <td>
524 no
525 </td>
526 </tr>
527 <tr>
528 <td>
529 <em>Percentages:</em>
530 </td>
531 <td>
532 N/A
533 </td>
534 </tr>
535 <tr>
536 <td>
537 <em>Media:</em>
538 </td>
539 <td>
540 visual
541 </td>
542 </tr>
543 <tr>
544 <td>
545 <em>Computed value:</em>
546 </td>
547 <td>
548 Same as specified value.
549 </td>
550 </tr>
551 </tbody>
552 </table>
554 <p>
555 By default the value is '0s', meaning that the animation cycle is
556 immediate. A negative value for <code
557 class="property">'animation-duration'</code> is treated as '0s'. In this
558 case <code class="property">'animation-fill-mode'</code> still applies,
559 so an animation that fills backwards will show the value of the 0%
560 keyframe during any delay period, and an animation that fill forwards
561 will retain the value specified at the 100% keyframe, even if the
562 animation was instantaneous. Also, animation events are still fired.
563 </p>
565 <!-- ======================================================================================================= -->
566 <h3 id="animation-timing-function_tag">
567 The <code class="property">'animation-timing-function'</code> Property
568 </h3>
569 <p>
570 The <code class="property">'animation-timing-function'</code> property describes how the animation will progress over one cycle of its duration. See the <code class="property">'transition-timing-function'</code> property [[!CSS3-TRANSITIONS]] for a complete description of timing function calculation.
571 </p>
572 <table class="propdef">
573 <tbody>
574 <tr>
575 <td>
576 <em>Name:</em>
577 </td>
578 <td>
579 <dfn id="animation-timing-function">animation-timing-function</dfn>
580 </td>
581 </tr>
582 <tr>
583 <td>
584 <em>Value:</em>
585 </td>
586 <td>
587 ease | linear | ease-in | ease-out | ease-in-out | step-start | step-end | steps(<number>[, start | end ]) | cubic-bezier(<number>, <number>, <number>, <number>) [, ease | linear | ease-in | ease-out | ease-in-out | step-start | step-end | steps(<number>[, start | end ]) | cubic-bezier(<number>, <number>, <number>, <number>)]*
588 </td>
589 </tr>
590 <tr>
591 <td>
592 <em>Initial:</em>
593 </td>
594 <td>
595 ease
596 </td>
597 </tr>
598 <tr>
599 <td>
600 <em>Applies to:</em>
601 </td>
602 <td>
603 all elements, :before and :after pseudo elements
604 </td>
605 </tr>
606 <tr>
607 <td>
608 <em>Inherited:</em>
609 </td>
610 <td>
611 no
612 </td>
613 </tr>
614 <tr>
615 <td>
616 <em>Percentages:</em>
617 </td>
618 <td>
619 N/A
620 </td>
621 </tr>
622 <tr>
623 <td>
624 <em>Media:</em>
625 </td>
626 <td>
627 visual
628 </td>
629 </tr>
630 <tr>
631 <td>
632 <em>Computed value:</em>
633 </td>
634 <td>
635 Same as specified value.
636 </td>
637 </tr>
638 </tbody>
639 </table>
641 <p>
642 For a keyframed animation, the <code class="property">'animation-timing-function'</code> applies
643 between keyframes, not over the entire animation. For example, in the case of an ease-in-out timing function, an animation will ease in at the start of the keyframe and ease out at the end of the keyframe. A <code class="property">'animation-timing-function'</code> defined within a keyframe block applies to that keyframe, otherwise the timing function specified for the animation is used.
644 </p>
646 <!-- ======================================================================================================= -->
647 <h3>
648 The <code class="property">'animation-iteration-count'</code> Property
649 </h3>
650 <p>
651 The <code class="property">'animation-iteration-count'</code> property defines the number of times
652 an animation cycle is played. The default value is one, meaning the animation will play from
653 beginning to end once. A value of <code class="css">'infinite'</code> will cause the animation to
654 repeat forever. Non-integer numbers will cause the animation to end part-way through a cycle.
655 Negative values of <code class="property">'animation-iteration-count'</code> are invalid.
656 This property is often used with an <code class="property">'animation-direction'</code> value of
657 <code class="css">alternate</code>, which will cause the animation to play in reverse on alternate cycles.
658 </p>
659 <table class="propdef">
660 <tbody>
661 <tr>
662 <td>
663 <em>Name:</em>
664 </td>
665 <td>
666 <dfn id="animation-iteration-count">animation-iteration-count</dfn>
667 </td>
668 </tr>
669 <tr>
670 <td>
671 <em>Value:</em>
672 </td>
673 <td>
674 infinite | <number> [, infinite | <number>]*
675 </td>
676 </tr>
677 <tr>
678 <td>
679 <em>Initial:</em>
680 </td>
681 <td>
682 1
683 </td>
684 </tr>
685 <tr>
686 <td>
687 <em>Applies to:</em>
688 </td>
689 <td>
690 all elements, :before and :after pseudo elements
691 </td>
692 </tr>
693 <tr>
694 <td>
695 <em>Inherited:</em>
696 </td>
697 <td>
698 no
699 </td>
700 </tr>
701 <tr>
702 <td>
703 <em>Percentages:</em>
704 </td>
705 <td>
706 N/A
707 </td>
708 </tr>
709 <tr>
710 <td>
711 <em>Media:</em>
712 </td>
713 <td>
714 visual
715 </td>
716 </tr>
717 <tr>
718 <td>
719 <em>Computed value:</em>
720 </td>
721 <td>
722 Same as specified value.
723 </td>
724 </tr>
725 </tbody>
726 </table><!-- ======================================================================================================= -->
727 <h3>
728 The <code class="property">'animation-direction'</code> Property
729 </h3>
730 <p>
731 The <code class="property">'animation-direction'</code> property defines whether or not the animation should play in reverse on alternate cycles. If <code class="css">alternate</code> is specified, the animation cycle iterations that are odd counts are played in the normal direction, and the animation cycle iterations that are even counts are played in a reverse direction. When an animation is played in reverse the timing functions are also reversed. For example, when played in reverse an ease-in animation would appear to be an ease-out animation.
732 </p>
733 <table class="propdef">
734 <tbody>
735 <tr>
736 <td>
737 <em>Name:</em>
738 </td>
739 <td>
740 <dfn id="animation-direction">animation-direction</dfn>
741 </td>
742 </tr>
743 <tr>
744 <td>
745 <em>Value:</em>
746 </td>
747 <td>
748 normal | alternate [, normal | alternate]*
749 </td>
750 </tr>
751 <tr>
752 <td>
753 <em>Initial:</em>
754 </td>
755 <td>
756 normal
757 </td>
758 </tr>
759 <tr>
760 <td>
761 <em>Applies to:</em>
762 </td>
763 <td>
764 all elements, :before and :after pseudo elements
765 </td>
766 </tr>
767 <tr>
768 <td>
769 <em>Inherited:</em>
770 </td>
771 <td>
772 no
773 </td>
774 </tr>
775 <tr>
776 <td>
777 <em>Percentages:</em>
778 </td>
779 <td>
780 N/A
781 </td>
782 </tr>
783 <tr>
784 <td>
785 <em>Media:</em>
786 </td>
787 <td>
788 visual
789 </td>
790 </tr>
791 <tr>
792 <td>
793 <em>Computed value:</em>
794 </td>
795 <td>
796 Same as specified value.
797 </td>
798 </tr>
799 </tbody>
800 </table><!-- ======================================================================================================= -->
801 <h3>
802 The <code class="property">'animation-play-state'</code> Property
803 </h3>
805 <p>
806 The <code class="property">'animation-play-state'</code> property defines whether the animation is running or paused. A running animation can be paused by setting this property to <code class="css">'paused'</code>. To continue running a paused animation this property can be set to <code class="css">'running'</code>. A paused animation will continue to display the current value of the animation in a static state, as if the time of the animation is constant. When a paused animation is resumed, it restarts from the current value, not necessarily from the beginning of the animation.
807 </p>
808 <table class="propdef">
809 <tbody>
810 <tr>
811 <td>
812 <em>Name:</em>
813 </td>
814 <td>
815 <dfn id="animation-play-state">animation-play-state</dfn>
816 </td>
817 </tr>
818 <tr>
819 <td>
820 <em>Value:</em>
821 </td>
822 <td>
823 running | paused [, running | paused]*
824 </td>
825 </tr>
826 <tr>
827 <td>
828 <em>Initial:</em>
829 </td>
830 <td>
831 running
832 </td>
833 </tr>
834 <tr>
835 <td>
836 <em>Applies to:</em>
837 </td>
838 <td>
839 all elements, :before and :after pseudo elements
840 </td>
841 </tr>
842 <tr>
843 <td>
844 <em>Inherited:</em>
845 </td>
846 <td>
847 no
848 </td>
849 </tr>
850 <tr>
851 <td>
852 <em>Percentages:</em>
853 </td>
854 <td>
855 N/A
856 </td>
857 </tr>
858 <tr>
859 <td>
860 <em>Media:</em>
861 </td>
862 <td>
863 visual
864 </td>
865 </tr>
866 <tr>
867 <td>
868 <em>Computed value:</em>
869 </td>
870 <td>
871 Same as specified value.
872 </td>
873 </tr>
874 </tbody>
875 </table><!-- ======================================================================================================= -->
876 <h3>
877 The <code class="property">'animation-delay'</code> Property
878 </h3>
879 <p>
880 The <code class="property">'animation-delay'</code> property defines
881 when the animation will start. It allows an animation to begin
882 execution some time after it is applied. An <code
883 class="property">'animation-delay'</code> value of '0s' means the
884 animation will execute as soon as it is applied. Otherwise, the value
885 specifies an offset from the moment the animation is applied, and the
886 animation will delay execution by that offset.
887 </p>
888 <p>
889 If the value for <code class="property">'animation-delay'</code> is a
890 negative time offset then the animation will execute the moment it is
891 applied, but will appear to have begun execution at the specified
892 offset. That is, the animation will appear to begin part-way through
893 its play cycle. In the case where an animation has implied starting
894 values and a negative <code class="property">'animation-delay'</code>,
895 the starting values are taken from the moment the animation is applied.
896 </p>
897 <table class="propdef">
898 <tbody>
899 <tr>
900 <td>
901 <em>Name:</em>
902 </td>
903 <td>
904 <dfn id="animation-delay">animation-delay</dfn>
905 </td>
906 </tr>
907 <tr>
908 <td>
909 <em>Value:</em>
910 </td>
911 <td>
912 <time> [, <time>]*
913 </td>
914 </tr>
915 <tr>
916 <td>
917 <em>Initial:</em>
918 </td>
919 <td>
920 0s
921 </td>
922 </tr>
923 <tr>
924 <td>
925 <em>Applies to:</em>
926 </td>
927 <td>
928 all elements, :before and :after pseudo elements
929 </td>
930 </tr>
931 <tr>
932 <td>
933 <em>Inherited:</em>
934 </td>
935 <td>
936 no
937 </td>
938 </tr>
939 <tr>
940 <td>
941 <em>Percentages:</em>
942 </td>
943 <td>
944 N/A
945 </td>
946 </tr>
947 <tr>
948 <td>
949 <em>Media:</em>
950 </td>
951 <td>
952 visual
953 </td>
954 </tr>
955 <tr>
956 <td>
957 <em>Computed value:</em>
958 </td>
959 <td>
960 Same as specified value.
961 </td>
962 </tr>
963 </tbody>
964 </table><!-- ======================================================================================================= -->
965 <h3>
966 The <code class="property">'animation-fill-mode'</code> Property
967 </h3>
968 <p>
969 The <code class="property">'animation-fill-mode'</code> property defines
970 what values are applied by the animation outside the time it is executing.
971 By default, an animation will not affect property values between the
972 time it is applied (the <code class="property">'animation-name'</code> property is
973 set on an element) and the time it begins execution (which is determined by
974 the <code class="property">'animation-delay'</code> property). Also, by
975 default an animation does not affect property values after the animation
976 ends (determined by the <code class="property">'animation-duration'</code> property).
977 The value of <code class="property">'animation-fill-mode'</code> can
978 override this behavior.
979 </p>
980 <p>
981 If the value for <code class="property">'animation-fill-mode'</code> is
982 <code class="css">'backwards'</code>, then the animation will
983 apply the property values defined in its 0% or 'from' keyframe as soon
984 as the animation is applied, during the period defined by
985 <code class="property">'animation-delay'</code>.
986 </p>
987 <p>
988 If the value for <code class="property">'animation-fill-mode'</code>
989 is <code class="css">'forwards'</code>, then the animation will
990 apply the property values defined in its last executing keyframe after
991 the final iteration of the animation, until the animation style is
992 removed. The last executing keyframe is the 'to' or '100%' keyframe,
993 unless the animation has <code
994 class="property">'animation-direction'</code> set to <code
995 class="css">'alternate'</code> and both a finite and even
996 iteration count, in which case it is the 'from' or '0%' keyframe.
997 </p>
998 <p>
999 If the value for <code class="property">'animation-fill-mode'</code>
1000 is <code class="css">'both'</code>, then the animation will
1001 follow the rules for both 'forwards' and 'backwards'. That is, it will
1002 extend the animation properties in both directions.
1003 </p>
1004 <table class="propdef">
1005 <tbody>
1006 <tr>
1007 <td>
1008 <em>Name:</em>
1009 </td>
1010 <td>
1011 <dfn id="animation-fill-mode">animation-fill-mode</dfn>
1012 </td>
1013 </tr>
1014 <tr>
1015 <td>
1016 <em>Value:</em>
1017 </td>
1018 <td>
1019 none | forwards | backwards | both [, none | forwards | backwards | both]*
1020 </td>
1021 </tr>
1022 <tr>
1023 <td>
1024 <em>Initial:</em>
1025 </td>
1026 <td>
1027 none
1028 </td>
1029 </tr>
1030 <tr>
1031 <td>
1032 <em>Applies to:</em>
1033 </td>
1034 <td>
1035 all elements, :before and :after pseudo elements
1036 </td>
1037 </tr>
1038 <tr>
1039 <td>
1040 <em>Inherited:</em>
1041 </td>
1042 <td>
1043 no
1044 </td>
1045 </tr>
1046 <tr>
1047 <td>
1048 <em>Percentages:</em>
1049 </td>
1050 <td>
1051 N/A
1052 </td>
1053 </tr>
1054 <tr>
1055 <td>
1056 <em>Media:</em>
1057 </td>
1058 <td>
1059 visual
1060 </td>
1061 </tr>
1062 <tr>
1063 <td>
1064 <em>Computed value:</em>
1065 </td>
1066 <td>
1067 Same as specified value.
1068 </td>
1069 </tr>
1070 </tbody>
1071 </table><!-- ======================================================================================================= -->
1072 <h3>
1073 The <code class="property">'animation'</code> Shorthand Property
1074 </h3>
1075 <p>
1076 The <code class="property">'animation'</code> shorthand property
1077 combines seven of the animation properties into a single property.
1078 </p>
1079 <p>
1080 Note that order is important in this property. The first value that can be
1081 parsed as a time is assigned to the animation-duration. The second value that
1082 can be parsed as a time is assigned to animation-delay.
1083 </p>
1084 <p class="issue">
1085 An alternative proposal is to accept the font shorthand approach of
1086 using a "/" character between the values of the same type. eg. 2s/4s would
1087 mean a duration of 2 seconds and a delay of 4 seconds.
1088 </p>
1089 <table class="propdef">
1090 <tbody>
1091 <tr>
1092 <td>
1093 <em>Name:</em>
1094 </td>
1095 <td>
1096 <dfn id="animation">animation</dfn>
1097 </td>
1098 </tr>
1099 <tr>
1100 <td>
1101 <em>Value:</em>
1102 </td>
1103 <td>
1104 [<animation-name> ||
1105 <animation-duration> ||
1106 <animation-timing-function> ||
1107 <animation-delay> ||
1108 <animation-iteration-count> ||
1109 <animation-direction> ||
1110 <animation-fill-mode>]
1111 [, [<animation-name> ||
1112 <animation-duration> ||
1113 <animation-timing-function> ||
1114 <animation-delay> ||
1115 <animation-iteration-count> ||
1116 <animation-direction> ||
1117 <animation-fill-mode>] ]*
1118 </td>
1119 </tr>
1120 <tr>
1121 <td>
1122 <em>Initial:</em>
1123 </td>
1124 <td>
1125 see individual properties
1126 </td>
1127 </tr>
1128 <tr>
1129 <td>
1130 <em>Applies to:</em>
1131 </td>
1132 <td>
1133 all elements, :before and :after pseudo elements
1134 </td>
1135 </tr>
1136 <tr>
1137 <td>
1138 <em>Inherited:</em>
1139 </td>
1140 <td>
1141 no
1142 </td>
1143 </tr>
1144 <tr>
1145 <td>
1146 <em>Percentages:</em>
1147 </td>
1148 <td>
1149 N/A
1150 </td>
1151 </tr>
1152 <tr>
1153 <td>
1154 <em>Media:</em>
1155 </td>
1156 <td>
1157 visual
1158 </td>
1159 </tr>
1160 <tr>
1161 <td>
1162 <em>Computed value:</em>
1163 </td>
1164 <td>
1165 Same as specified value.
1166 </td>
1167 </tr>
1168 </tbody>
1169 </table><!-- ======================================================================================================= -->
1170 <h2>
1171 Animation Events
1172 </h2>
1173 <p>
1174 Several animation related events are available through the <a
1175 href="http://www.w3.org/TR/DOM-Level-2-Events/events.html">DOM Event
1176 system</a>. The start and end of an animation, and the end of each
1177 iteration of an animation all generate DOM events. An element can have
1178 multiple properties being animated simultaneously. This can occur either
1179 with a single <code class="property">animation-name</code> value with
1180 keyframes containing multiple properties, or with multiple <code
1181 class="property">animation-name</code> values. For the purposes of
1182 events, each <code class="property">animation-name</code> specifies a
1183 single animation. Therefore an event will be generated for each <code
1184 class="property">animation-name</code> value and not necessarily for
1185 each property being animated.
1186 </p>
1187 <p>
1188 The time the animation has been running is sent with each event
1189 generated. This allows the event handler to determine the current
1190 iteration of a looping animation or the current position of an
1191 alternating animation. This time does not include any time the animation
1192 was in the <code>paused</code> play state.
1193 </p>
1194 <dl>
1195 <dt>
1196 <b>Interface <i><a id="Events-AnimationEvent" name='Events-AnimationEvent'>AnimationEvent</a></i></b>
1197 </dt>
1198 <dd>
1199 <p>
1200 The <code>AnimationEvent</code> interface provides specific contextual information associated with Animation events.
1201 </p>
1202 <dl>
1203 <dt>
1204 <br>
1205 <b>IDL Definition</b>
1206 </dt>
1207 <dd>
1208 <div class='idl-code'>
1209 <pre>
1210 interface AnimationEvent : Event {
1211 readonly attribute DOMString animationName;
1212 readonly attribute float elapsedTime;
1213 void initAnimationEvent(in DOMString typeArg,
1214 in boolean canBubbleArg,
1215 in boolean cancelableArg,
1216 in DOMString animationNameArg,
1217 in float elapsedTimeArg);
1218 };
1219 </pre>
1220 </div>
1221 </dd>
1222 <dt>
1223 <b>Attributes</b>
1224 </dt>
1225 <dd>
1226 <dl>
1227 <dt>
1228 <code class='attribute-name'><a id="Events-AnimationEvent-animationName" name='Events-AnimationEvent-animationName'>animationName</a></code> of type <code>DOMString</code>, readonly
1229 </dt>
1230 <dd>
1231 The value of the <code class="property">animation-name</code> property of the
1232 animation that fired the event.
1233 </dd>
1234 </dl>
1235 <dl>
1236 <dt>
1237 <code class='attribute-name'><a id="Events-AnimationEvent-elapsedTime" name='Events-AnimationEvent-elapsedTime'>elapsedTime</a></code> of type <code>float</code>, readonly
1238 </dt>
1239 <dd>
1240 The amount of time the animation has been running, in
1241 seconds, when this event fired, excluding any time the
1242 animation was paused. For an "animationstart" event, the
1243 elapsedTime is zero unless there was a negative value for
1244 <code class="property">animation-delay</code>, in which
1245 case the event will be fired with an elapsedTime of (-1 *
1246 delay).
1247 </dd>
1248 </dl>
1249 </dd>
1250 <dt>
1251 <b>Methods</b>
1252 </dt>
1253 <dd>
1254 <dl>
1255 <dt>
1256 <code class='method-name'><a id="Events-AnimationEvent-initAnimationEvent" name='Events-AnimtionEvent-initAnimationEvent'>initAnimationEvent</a></code>
1257 </dt>
1258 <dd>
1259 <div class='method'>
1260 The <code>initAnimationEvent</code> method is used to initialize the value of an <code>AnimationEvent</code> created through the <a href='http://www.w3.org/TR/DOM-Level-2-Events/events.html#Events-DocumentEvent'><code>DocumentEvent</code></a> interface. This method may only be called before the <code>AnimationEvent</code> has been dispatched via the <code>dispatchEvent</code> method, though it may be called multiple times during that phase if necessary. If called multiple times, the final invocation takes precedence.
1261 <div class='parameters'>
1262 <b>Parameters</b>
1263 <div class='paramtable'>
1264 <dl>
1265 <dt>
1266 <code class='parameter-name'>typeArg</code> of type <code>DOMString</code>
1267 </dt>
1268 <dd>
1269 Specifies the event type.<br>
1270 </dd>
1271 <dt>
1272 <code class='parameter-name'>canBubbleArg</code> of type <code>boolean</code>
1273 </dt>
1274 <dd>
1275 Specifies whether or not the event can bubble.<br>
1276 </dd>
1277 <dt>
1278 <code class='parameter-name'>cancelableArg</code> of type <code>boolean</code>
1279 </dt>
1280 <dd>
1281 Specifies whether or not the event's default action can be prevented.
1282 </dd>
1283 <dt>
1284 <code class='parameter-name'>animationNameArg</code> of type <code>DOMString</code>
1285 </dt>
1286 <dd>
1287 Specifies the <a href='http://www.w3.org/TR/DOM-Level-2-Events/events.html#Events-Event'><code>Event</code></a>'s animation name.<br>
1288 </dd>
1289 <dt>
1290 <code class='parameter-name'>elapsedTimeArg</code> of type <code>float</code>
1291 </dt>
1292 <dd>
1293 Specifies the amount of time, in seconds, the animation has been running at the time of initialization.
1294 </dd>
1295 </dl>
1296 </div>
1297 </div><!-- parameters -->
1298 <div>
1299 <b>No Return Value</b>
1300 </div>
1301 <div>
1302 <b>No Exceptions</b>
1303 </div>
1304 </div><!-- method -->
1305 </dd>
1306 </dl>
1307 </dd>
1308 </dl>
1309 </dd>
1310 </dl>
1311 <p>
1312 The different types of Animation events that can occur are:
1313 </p>
1314 <dl>
1315 <dt>
1316 <b>animationstart</b>
1317 </dt>
1318 <dd>
1319 The 'animationstart' event occurs at the start of the animation. If there is an
1320 <code class="property">animation-delay</code> then this event will fire once the delay period
1321 has expired. A negative delay will cause the event to fire with an elapsedTime equal to
1322 the absolute value of the delay.
1323 <ul>
1324 <li>Bubbles: Yes
1325 </li>
1326 <li>Cancelable: No
1327 </li>
1328 <li>Context Info: animationName
1329 </li>
1330 </ul>
1331 </dd>
1332 <dt>
1333 <b>animationend</b>
1334 </dt>
1335 <dd>
1336 The 'animationend' event occurs when the animation finishes.
1337 <ul>
1338 <li>Bubbles: Yes
1339 </li>
1340 <li>Cancelable: No
1341 </li>
1342 <li>Context Info: animationName, elapsedTime
1343 </li>
1344 </ul>
1345 </dd>
1346 <dt>
1347 <b>animationiteration</b>
1348 </dt>
1349 <dd>
1350 The 'animationiteration' event occurs at the end of each iteration of an animation for which <code>animation-iteration-count</code> is greater than one. This event does not occur for animations with an iteration count of one.
1351 <ul>
1352 <li>Bubbles: Yes
1353 </li>
1354 <li>Cancelable: No
1355 </li>
1356 <li>Context Info: animationName, elapsedTime
1357 </li>
1358 </ul>
1359 </dd>
1360 </dl>
1361 <!-- ======================================================================================================= -->
1362 <h2>
1363 DOM Interfaces
1364 </h2>
1365 <p>
1366 CSS animation is exposed to the CSSOM through a pair of new interfaces
1367 describing the keyframes.
1368 </p>
1369 <dl>
1370 <dt>
1371 <b>Interface <i><a id="DOM-CSSRule" name='DOM-CSSRule'>CSSRule</a></i></b>
1372 </dt>
1373 <dd>
1374 <p>
1375 The following 2 rule types are added to the <code>CSSRule</code> interface. They provide identification for the new keyframe and keyframes rules.
1376 </p>
1377 <dl>
1379 <dt>
1380 <b>IDL Definition</b>
1381 </dt>
1382 <dd>
1383 <div class='idl-code'>
1384 <pre>
1385 interface CSSRule {
1386 ...
1387 const unsigned short KEYFRAMES_RULE = 7;
1388 const unsigned short KEYFRAME_RULE = 8;
1389 ...
1390 };</pre>
1391 </div>
1392 </dd> <!-- IDL -->
1393 </dl>
1394 </dd>
1396 <dt>
1397 <b>Interface <i><a id="DOM-CSSKeyframeRule" name='DOM-CSSKeyframeRule'>CSSKeyframeRule</a></i></b>
1398 </dt>
1399 <dd>
1400 <p>
1401 The <code>CSSKeyframeRule</code> interface represents the style rule for a single key.
1402 </p>
1403 <dl>
1404 <dt>
1405 <br>
1406 <b>IDL Definition</b>
1407 </dt>
1408 <dd>
1409 <div class='idl-code'>
1410 <pre>
1411 interface CSSKeyframeRule : CSSRule {
1412 attribute DOMString keyText;
1413 readonly attribute CSSStyleDeclaration style;
1414 };
1415 </pre>
1416 </div><br>
1417 </dd>
1418 <dt>
1419 <b>Attributes</b>
1420 </dt>
1421 <dd>
1422 <dl>
1423 <dt>
1424 <code class='attribute-name'><a id="DOM-CSSKeyframeRule-keyText" name='DOM-CSSKeyframeRule-keyText'>keyText</a></code> of type <code>DOMString</code>
1425 </dt>
1426 <dd>
1427 This attribute represents the key as the string representation of a floating point number between 0 and 1. If the value
1428 in the CSS style is <code>from</code> this value will be 0, and if the value in the CSS style is <code>to</code> this
1429 value will be 1.<br>
1430 </dd>
1431 </dl>
1432 </dd>
1433 <dd>
1434 <dl>
1435 <dt>
1436 <code class='attribute-name'><a id="DOM-CSSKeyframeRule-style" name='DOM-CSSKeyframeRule-style'>style</a></code> of type <code>CSSStyleDeclaration</code>
1437 </dt>
1438 <dd>
1439 This attribute represents the style associated with this keyframe.<br>
1440 </dd>
1441 </dl>
1442 </dd>
1443 <dt>
1444 <b>No Methods</b>
1445 </dt>
1446 </dl>
1447 </dd>
1448 </dl>
1449 <dl>
1450 <dt>
1451 <b>Interface <i><a id="DOM-CSSKeyframesRule" name='DOM-CSSKeyframesRule'>CSSKeyframesRule</a></i></b>
1452 </dt>
1453 <dd>
1454 <p>
1455 The <code>CSSKeyframesRule</code> interface represents a complete set of keyframes for a single animation.
1456 </p>
1457 <dl>
1458 <dt>
1459 <br>
1460 <b>IDL Definition</b>
1461 </dt>
1462 <dd>
1463 <div class='idl-code'>
1464 <pre>
1465 interface CSSKeyframesRule : CSSRule {
1466 attribute DOMString name;
1467 readonly attribute CSSRuleList cssRules;
1469 void appendRule(in DOMString rule);
1470 void deleteRule(in DOMString key);
1471 CSSKeyframeRule findRule(in DOMString key);
1472 };
1473 </pre>
1474 </div><br>
1475 </dd>
1476 <dt>
1477 <b>Attributes</b>
1478 </dt>
1479 <dd>
1480 <dl>
1481 <dt>
1482 <code class='attribute-name'><a id="DOM-CSSKeyframesRule-name" name='DOM-CSSKeyframesRule-name'>name</a></code> of type <code>DOMString</code>
1483 </dt>
1484 <dd>
1485 This attribute is the name of the keyframes, used by the <code>animation-name</code> property.<br>
1486 </dd>
1487 </dl>
1488 </dd>
1489 <dd>
1490 <dl>
1491 <dt>
1492 <code class='attribute-name'><a id="DOM-CSSKeyframeRules-cssRules" name='DOM-CSSKeyframeRules-cssRules'>cssRules</a></code> of type <code>CSSRuleList</code>
1493 </dt>
1494 <dd>
1495 This attribute gives access to the keyframes in the list.<br>
1496 </dd>
1497 </dl>
1498 </dd>
1499 <dt>
1500 <b>Methods</b>
1501 <dd>
1502 <dl>
1503 <!-- ======================================================================================================= -->
1504 <dt>
1505 <code class='method-name'><a id="DOM-CSSKeyframesRule-appendRule" name='DOM-CSSKeyframesRule-appendRule'>appendRule</a></code>
1506 </dt>
1507 <dd>
1508 <div class='method'>
1509 The <code>appendRule</code> method appends the passed CSSKeyframeRule into the list at the passed key.
1510 <div class='parameters'>
1511 <b>Parameters</b>
1512 <div class='paramtable'>
1513 <dl>
1514 <dt>
1515 <code class='parameter-name'>rule</code> of type <code>DOMString</code>
1516 </dt>
1517 <dd>
1518 The rule to be appended, expressed in the same syntax as one entry in the
1519 <code>@keyframes</code> rule.
1520 </dd>
1521 </dl>
1522 </div>
1523 </div><!-- parameters -->
1524 <div class='return-value'>
1525 <b>No Return Value</b>
1526 </div>
1527 <div>
1528 <b>No Exceptions</b>
1529 </div>
1530 </div><!-- ======================================================================================================= -->
1531 </dd>
1532 <dt>
1533 <code class='method-name'><a id="DOM-CSSKeyframesRule-deleteRule" name='DOM-CSSKeyframesRule-deleteRule'>deleteRule</a></code>
1534 </dt>
1535 <dd>
1536 <div class='method'>
1537 The <code>deleteRule</code> method deletes the CSSKeyframeRule with the passed key. If a rule with this key
1538 does not exist, the method does nothing.
1539 <div class='parameters'>
1540 <b>Parameters</b>
1541 <div class='paramtable'>
1542 <dl>
1543 <dt>
1544 <code class='parameter-name'>key</code> of type <code>DOMString</code>
1545 </dt>
1546 <dd>
1547 The key which describes the rule to be deleted. The key must
1548 resolve to a number between 0 and 1, or the rule is ignored.<br>
1549 </dd>
1550 </dl>
1551 </div>
1552 </div><!-- parameters -->
1553 <div class='return-value'>
1554 <b>No Return Value</b>
1555 </div>
1556 <div>
1557 <b>No Exceptions</b>
1558 </div>
1559 </div><!-- ======================================================================================================= -->
1560 </dd>
1561 <dt>
1562 <code class='method-name'><a id="DOM-CSSKeyframesRule-findRule" name='DOM-CSSKeyframesRule-findRule'>findRule</a></code>
1563 </dt>
1564 <dd>
1565 <div class='method'>
1566 The <code>findRule</code> method returns the rule with a key matching the passed key. If no such rule
1567 exists, a null value is returned.
1568 <div class='parameters'>
1569 <b>Parameters</b>
1570 <div class='paramtable'>
1571 <dl>
1572 <dt>
1573 <code class='parameter-name'>key</code> of type <code>DOMString</code>
1574 </dt>
1575 <dd>
1576 The key which described the rule to find. The key must
1577 resolve to a number between 0 and 1, or the rule is ignored.<br>
1578 </dd>
1579 </dl>
1580 </div>
1581 </div><!-- parameters -->
1582 <div class='return-value'>
1583 <b>Return Value</b>
1584 <div class='returnvalue'>
1585 <dl>
1586 <dt>
1587 <code>CSSKeyframeRule</code>
1588 </dt>
1589 <dd>
1590 The found rule.<br>
1591 </dd>
1592 </dl>
1593 </div>
1594 </div>
1595 <div>
1596 <b>No Exceptions</b>
1597 </div>
1598 </div><!-- ======================================================================================================= -->
1599 </dd>
1600 </dl><!-- method -->
1601 </dd>
1602 </dt>
1603 </dl>
1604 </dd>
1605 </dl>
1607 <h2>References</h2>
1609 <h3 class="no-num">Normative references</h3>
1610 <!--normative-->
1612 <h3 class="no-num">Other references</h3>
1613 <!--informative-->
1617 <h2 class="no-num">Property index</h2>
1618 <!-- properties -->
1622 <h2 class="no-num" id="index">Index</h2>
1623 <!--index-->
1625 </body>
1626 </html>
1627 <!-- Keep this comment at the end of the file
1628 Local variables:
1629 mode: sgml
1630 sgml-default-doctype-name:"html"
1631 sgml-minimize-attributes:t
1632 End:
1633 -->