css3-animations/Overview.src.html@7435096f75b2
css3-animations/Overview.src.html
Sat, 17 Dec 2011 04:37:18 +0000
- author
- L. David Baron <dbaron@dbaron.org>
- date
- Sat, 17 Dec 2011 04:37:18 +0000
- changeset 4123
- 7435096f75b2
- parent 4122
- 2579c1842a7c
- child 4174
- 419909ea4220
- permissions
- -rw-r--r--
Further tweak whitespace in keyframes grammar, both to add more places allowed whitespace was missing, and to follow the convention that productions allow whitespace at their end but not their start.
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 <style type="text/css">
9 .rhs { white-space: pre-wrap; }
10 code { font-size: inherit; }
11 #box-shadow-samples td { background: white; color: black; }
13 table {
14 border-collapse: collapse;
15 }
16 td {
17 padding: 0.2em 1em;
18 border: 1px solid black;
19 }
20 </style>
21 <link rel="stylesheet" type="text/css"
22 href="http://www.w3.org/StyleSheets/TR/W3C-WD.css">
23 </head>
25 <body>
27 <div class="head">
28 <!--logo-->
30 <h1>CSS Animations</h1>
32 <h2 class="no-num no-toc">[LONGSTATUS] [DATE]</h2>
33 <dl>
34 <dt>This version:
35 <dd><a href="[VERSION]">http://dev.w3.org/csswg/css3-animations/</a>
36 <!--http://www.w3.org/TR/[YEAR]/WD-[SHORTNAME]-[CDATE]-->
37 <dt>Latest version:
38 <dd><a
39 href="http://www.w3.org/TR/css3-animations">[LATEST]</a>
40 <dt>Editor's draft:
41 <dd><a href="http://dev.w3.org/csswg/[SHORTNAME]/">http://dev.w3.org/csswg/[SHORTNAME]/</a>
43 <dt>Previous version:
44 <dd><a href="http://www.w3.org/TR/2009/WD-css3-animations-20090320/">
45 http://www.w3.org/TR/2009/WD-css3-animations-20090320/</a>
46 <dt id="editors-list">Editors:
47 <dd><a href="mailto:dino@apple.com">Dean Jackson</a> (<a
48 href="http://www.apple.com/">Apple Inc</a>)
49 <dd><a href="mailto:hyatt@apple.com">David Hyatt</a> (<a
50 href="http://www.apple.com/">Apple Inc</a>)
51 <dd><a href="mailto:cmarrin@apple.com">Chris Marrin</a> (<a
52 href="http://www.apple.com/">Apple Inc</a>)
53 <dd><a href="mailto:sylvaing@microsoft.com">Sylvain Galineau</a>
54 (<a class=org href="http://www.microsoft.com/">Microsoft</a>)
55 <dd class=vcard><a class=fn href="http://dbaron.org/">L. David Baron</a>
56 (<a class=org href="http://www.mozilla.org/">Mozilla</a>)
58 <dt>Issues list:
59 <dd>none yet
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>This CSS module describes a way for authors to animate the values of CSS properties over time, using keyframes.
73 The behavior of these keyframe animations can be controlled by specifying their duration, number of repeats,
74 and repeating behavior.
75 </p>
77 <h2 class="no-num no-toc" id="status">Status of this document</h2>
78 <!--status-->
81 <h2 class="no-num no-toc" id="contents">Table of contents</h2>
82 <!--toc-->
85 <h2 id="introduction">Introduction</h2>
87 <p><em>This section is not normative.</em>
89 <p>
90 CSS Transitions [[!CSS3-TRANSITIONS]] provide a way to interpolate CSS property values
91 when they change as a result of underlying property changes. This provides an easy way to do simple animation,
92 but the start and end states of the animation are controlled by the existing property values,
93 and transitions provide little control to the author on how the animation progresses.
94 </p>
95 <p>
96 This proposal introduces <em>defined animations</em>, in which the author can
97 specify the changes in CSS properties over time as a set of keyframes. Animations are similar to transitions
98 in that they change the presentational value of CSS properties over time.
99 The principal difference is that while transitions trigger <i>implicitly</i> when property values change, animations
100 are <i>explicitly</i> executed when the animation properties are applied. Because of this, animations require explicit
101 values for the properties being animated. These values are specified using animation keyframes, described below.
102 </p>
103 <p>
104 Many aspects of the animation can be controlled, including how many times the animation iterates, whether or not
105 it alternates between the begin and end values, and whether or not the animation should be running or paused.
106 An animation can also delay its start time.
107 </p>
109 <h2>Animations</h2>
111 <p>
112 CSS Animations affect computed property values. During the execution of an animation, the
113 computed value for a property is controlled by the animation. This overrides the value
114 specified in the normal styling system.
115 </p>
117 <p>
118 In the case of multiple animations specifying behavior for the same property, the animation
119 defined last will override the previously defined animations.
120 </p>
122 <p>
123 An animation does not affect the computed value before the application of the animation,
124 before the animation delay has expired, and after the end of the animation.
125 </p>
127 <div class="figure">
128 <img src="sandwich.png" alt="">
129 </div>
130 <p class="caption">
131 Computation of animated property values
132 </p>
134 <p>
135 The diagram above shows how property values are computed. The intrinsic style is shown at the
136 top of the diagram. The computed value is derived from intrinsic style at the times when an
137 animation is not running and also when an animation is delayed (see below for specification of
138 animation delay). During an animation, the computed style is derived from the animated value.
139 </p>
141 <p>
142 The start time of an animation is the latter of two moments: the time at which the style is
143 resolved that specifies the animation, or the time the document's load event is fired.
144 Therefore, an animation specified in the document stylesheet will begin at the document load.
145 An animation specified on an element by modifying the style after the document has loaded will
146 start when the style is resolved. That may be immediately in the case of a pseudo style rule
147 such as hover, or may be when the scripting engine returns control to the browser (in the case
148 of style applied by script).
149 </p>
151 <p>
152 An animation applies to an element if the element has a value for
153 <span class="prop-name">'animation-name'</span> that references a valid
154 keyframes rule. Once an animation has started it continues until it ends
155 or the <span class="prop-name">'animation-name'</span> is removed. The values
156 used for the keyframes and animation properties are snapshotted at the
157 time the animation starts. Changing them during the execution of the
158 animation has no effect. Note also, that changing the value of
159 <span class="prop-name">'animation-name'</span> does not necessarily
160 restart an animation (e.g. if a list of animations are applied and
161 one is removed from the list, only that animation will stop; The other
162 animations will continue). In order to restart an animation, it must be
163 removed then reapplied.
164 </p>
166 <p>
167 The end of the animation is defined by the combination of the
168 <span class="prop-name">'animation-duration'</span>,
169 <span class="prop-name">'animation-iteration-count'</span> and
170 <span class="prop-name">'animation-fill-mode'</span> properties.
171 </p>
173 <div class="example">
174 <p style="display:none">
175 Example(s):
176 </p>
177 <pre>
178 div {
179 animation-name: diagonal-slide;
180 animation-duration: 5s;
181 animation-iteration-count: 10;
182 }
184 @keyframes diagonal-slide {
186 from {
187 left: 0;
188 top: 0;
189 }
191 to {
192 left: 100px;
193 top: 100px;
194 }
196 }
198 </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).
199 </div>
201 <h2>Keyframes</h2>
202 <p>
203 Keyframes are used to specify the values for the animating properties at various points
204 during the animation. The keyframes specify the behavior of one cycle of the animation;
205 the animation may iterate one or more times.
206 </p>
207 <p>
208 Keyframes are specified using a specialized CSS at-rule. A <span
209 class="prop-name">@keyframes</span> rule consists of the keyword
210 "@keyframes", followed by an identifier giving a name for the animation
211 (which will be referenced using <span
212 class="prop-name">'animation-name'</span>), followed by a set of style
213 rules (delimited by curly braces).
214 </p>
215 <p>
216 The <i>keyframe selector</i> for a keyframe style rule consists of a
217 comma-separated list of percentage values or the keywords 'from' or
218 'to'. The selector is used to specify the percentage along the duration
219 of the animation that the keyframe represents. The
220 keyframe itself is specified by the block of property values declared on
221 the selector. The keyword 'from' is equivalent to the value 0%. The
222 keyword 'to' is equivalent to the value 100%. Note that the percentage
223 unit specifier must be used on percentage values. Therefore, "0" is an
224 invalid keyframe selector.
225 </p>
226 <p>
227 If a 0% or "from" keyframe is not specified, then the user agent
228 constructs a 0% keyframe using the computed values of the properties
229 being animated. If a 100% or "to" keyframe is not specified, then the user agent
230 constructs a 100% keyframe using the computed values of the properties
231 being animated.
232 </p>
233 <p>
234 The <i>keyframe declaration</i> for a keyframe rule consists of
235 properties and values. Properties that are unable to be
236 animated are ignored in these rules, with the exception of <span
237 class="prop-name">animation-timing-function'</span>, the behavior
238 of which is described below.
239 </p>
240 <p class="note">
241 NOTE: describe what happens if a property is not present in all keyframes.
242 </p>
243 <p>
244 The @keyframes rule that is used by an animation will be the last one encountered in sorted rules order
245 that matches the name of the animation specified by the <span class="prop-name">'animation-name'</span> property.
246 <span class="prop-name">@keyframes</span> rules do not cascade;
247 therefore an animation will never derive keyframes from more than one <span class="prop-name">@keyframes</span> rule.
248 </p>
249 <p>
250 To determine the set of keyframes, all of the values in selectors are sorted in increasing order by time.
251 If there are any duplicates, then the last keyframe specified inside the <span class="prop-name">@keyframes</span> rule
252 will be used to provide the keyframe information for that time. There is no cascading within a
253 <span class="prop-name">@keyframes</span> rule if multiple keyframes specify the same keyframe selector values.
254 </p>
255 <div class="example">
256 <p style="display:none">
257 Example(s):
258 </p>
259 <pre>
260 @keyframes wobble {
262 0% {
263 left: 100px;
264 }
266 40% {
267 left: 150px;
268 }
270 60% {
271 left: 75px;
272 }
274 100% {
275 left: 100px;
276 }
278 }
280 </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.
281 <div class="figure">
282 <img src="animation1.png" alt="">
283 </div>
284 <p class="caption">
285 Animations states specified by keyframes
286 </p>
287 </div>
289 <p>
290 The following is the grammar for the keyframes rule.
291 </p>
293 <pre>
295 keyframes-rule: KEYFRAMES_SYM S+ IDENT S* '{' S* keyframes-blocks '}' S*;
297 keyframes-blocks: [ keyframe-selector '{' S* declaration? [ ';' S* declaration? ]* '}' S* ]* ;
299 keyframe-selector: [ FROM_SYM | TO_SYM | PERCENTAGE ] S* [ ',' S* [ FROM_SYM | TO_SYM | PERCENTAGE ] S* ]*;
301 @{K}{E}{Y}{F}{R}{A}{M}{E}{S} {return KEYFRAMES_SYM;}
302 {F}{R}{O}{M} {return FROM_SYM;}
303 {T}{O} {return TO_SYM;}
304 </pre>
305 <!-- ======================================================================================================= -->
306 <h3>
307 Timing functions for keyframes
308 </h3>
309 <p>
310 A keyframe style rule may also declare the timing function that is to be used as the animation moves to the next keyframe.
311 </p>
312 <div class="example">
313 <p style="display:none">
314 Example(s):
315 </p>
316 <pre>
317 @keyframes bounce {
319 from {
320 top: 100px;
321 animation-timing-function: ease-out;
322 }
324 25% {
325 top: 50px;
326 animation-timing-function: ease-in;
327 }
329 50% {
330 top: 100px;
331 animation-timing-function: ease-out;
332 }
334 75% {
335 top: 75px;
336 animation-timing-function: ease-in;
337 }
339 to {
340 top: 100px;
341 }
343 }
345 </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
346 </div>
347 <p>
348 See <a href="#animation-timing-function_tag">the <span class="prop-name">'animation-timing-function'</span> property</a> for more information.
349 </p><!-- ======================================================================================================= -->
351 <!-- ======================================================================================================= -->
352 <h3>
353 The <span class="prop-name">'animation-name'</span> Property
354 </h3>
355 <p>
356 The <span class="prop-name">'animation-name'</span> property defines a
357 list of animations that apply. Each name is used to select the keyframe at-rule
358 that provides the property values for the animation. If the name does
359 not match any keyframe at-rule, there are no properties to be animated
360 and the animation will not execute. Furthermore, if the animation name
361 is 'none' then there will be no animation. This can be used to override
362 any animations coming from the cascade. If animations are attempting to
363 modify the same property, then the animation closest to the end of the
364 list of names wins.
365 </p>
366 <p>
367 Each animation listed by name should have a corresponding value
368 for the other animation properties listed below. In the case where the
369 other properties do not have lists of the correct length, their values
370 are repeated to form a list with the same number of entries as
371 <span class="prop-name">'animation-name'</span>.
372 </p>
373 <table class="propdef">
374 <tbody>
375 <tr>
376 <td>
377 <em>Name:</em>
378 </td>
379 <td>
380 <dfn id="animation-name">animation-name</dfn>
381 </td>
382 </tr>
383 <tr>
384 <td>
385 <em>Value:</em>
386 </td>
387 <td>
388 none | IDENT [, none | IDENT ]*
389 </td>
390 </tr>
391 <tr>
392 <td>
393 <em>Initial:</em>
394 </td>
395 <td>
396 none
397 </td>
398 </tr>
399 <tr>
400 <td>
401 <em>Applies to:</em>
402 </td>
403 <td>
404 all elements, :before and :after pseudo elements
405 </td>
406 </tr>
407 <tr>
408 <td>
409 <em>Inherited:</em>
410 </td>
411 <td>
412 no
413 </td>
414 </tr>
415 <tr>
416 <td>
417 <em>Percentages:</em>
418 </td>
419 <td>
420 N/A
421 </td>
422 </tr>
423 <tr>
424 <td>
425 <em>Media:</em>
426 </td>
427 <td>
428 visual
429 </td>
430 </tr>
431 <tr>
432 <td>
433 <em>Computed value:</em>
434 </td>
435 <td>
436 Same as specified value.
437 </td>
438 </tr>
439 </tbody>
440 </table>
442 <!--
443 <p>
444 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 <span class="prop-name">opacity</span> will add together and animations on <span class="prop-name">transform</span> will have their transformation matrices multiplied.
445 </p>
446 <div class="example">
447 <p style="display:none">
448 Example(s):
449 </p>
450 <pre>
451 @keyframes 'border-bloat' {
452 from {
453 border-width: 0;
454 }
455 to {
456 border-width: 10px;
457 }
458 }
460 @keyframes 'border-diet' {
461 from {
462 border-width: 4px;
463 }
464 to {
465 border-width: 2px;
466 }
467 }
469 div {
470 animation-name: 'border-bloat', 'border-diet';
471 animation-duration: 10s, 4s;
472 }
473 </pre>
474 <p>
475 The above example has two animations executing on the same property, <span class="prop-name">border-width</span>. The animations are additive. That is, the
476 resulting value for the property will be the addition of the values from the
477 two animations.
478 </p>
479 <p>
480 At time '0s' the element's border will be 4px wide (0px from 'border-bloat' plus 4px from 'border-diet').
481 At time '4s' the element's border will be 6px wide (4px from 'border-bloat' plus 2px from 'border-diet').
482 At time '10s' the element's border will be 10px wide (10px from 'border-bloat' and no addition from
483 'border-diet' as it is no longer executing).
484 </p>
485 </div>
486 -->
489 <!-- ======================================================================================================= -->
490 <h3>
491 The <span class="prop-name">'animation-duration'</span> Property
492 </h3>
493 <p>
494 The <span class="prop-name">'animation-duration'</span> property defines the length of time that an animation takes to complete one cycle.
495 </p>
496 <table class="propdef">
497 <tbody>
498 <tr>
499 <td>
500 <em>Name:</em>
501 </td>
502 <td>
503 <dfn id="animation-duration">animation-duration</dfn>
504 </td>
505 </tr>
506 <tr>
507 <td>
508 <em>Value:</em>
509 </td>
510 <td>
511 <time> [, <time>]*
512 </td>
513 </tr>
514 <tr>
515 <td>
516 <em>Initial:</em>
517 </td>
518 <td>
519 0s
520 </td>
521 </tr>
522 <tr>
523 <td>
524 <em>Applies to:</em>
525 </td>
526 <td>
527 all elements, :before and :after pseudo elements
528 </td>
529 </tr>
530 <tr>
531 <td>
532 <em>Inherited:</em>
533 </td>
534 <td>
535 no
536 </td>
537 </tr>
538 <tr>
539 <td>
540 <em>Percentages:</em>
541 </td>
542 <td>
543 N/A
544 </td>
545 </tr>
546 <tr>
547 <td>
548 <em>Media:</em>
549 </td>
550 <td>
551 visual
552 </td>
553 </tr>
554 <tr>
555 <td>
556 <em>Computed value:</em>
557 </td>
558 <td>
559 Same as specified value.
560 </td>
561 </tr>
562 </tbody>
563 </table>
565 <p>
566 By default the value is '0s', meaning that the animation cycle is
567 immediate. A negative value for <span
568 class="prop-name">animation-duration</span> is treated as '0s'. In this
569 case <span class="prop-name">animation-fill-mode</span> still applies,
570 so an animation that fills backwards will show the value of the 0%
571 keyframe during any delay period, and an animation that fill forwards
572 will retain the value specified at the 100% keyframe, even if the
573 animation was instantaneous. Also, animation events are still fired.
574 </p>
576 <!-- ======================================================================================================= -->
577 <h3 id="animation-timing-function_tag">
578 The <span class="prop-name">'animation-timing-function'</span> Property
579 </h3>
580 <p>
581 The <span class="prop-name">'animation-timing-function'</span> property describes how the animation will progress over one cycle of its duration. See the <span class="prop-name">'transition-timing-function'</span> property [[!CSS3-TRANSITIONS]] for a complete description of timing function calculation.
582 </p>
583 <table class="propdef">
584 <tbody>
585 <tr>
586 <td>
587 <em>Name:</em>
588 </td>
589 <td>
590 <dfn id="animation-timing-function">animation-timing-function</dfn>
591 </td>
592 </tr>
593 <tr>
594 <td>
595 <em>Value:</em>
596 </td>
597 <td>
598 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>)]*
599 </td>
600 </tr>
601 <tr>
602 <td>
603 <em>Initial:</em>
604 </td>
605 <td>
606 ease
607 </td>
608 </tr>
609 <tr>
610 <td>
611 <em>Applies to:</em>
612 </td>
613 <td>
614 all elements, :before and :after pseudo elements
615 </td>
616 </tr>
617 <tr>
618 <td>
619 <em>Inherited:</em>
620 </td>
621 <td>
622 no
623 </td>
624 </tr>
625 <tr>
626 <td>
627 <em>Percentages:</em>
628 </td>
629 <td>
630 N/A
631 </td>
632 </tr>
633 <tr>
634 <td>
635 <em>Media:</em>
636 </td>
637 <td>
638 visual
639 </td>
640 </tr>
641 <tr>
642 <td>
643 <em>Computed value:</em>
644 </td>
645 <td>
646 Same as specified value.
647 </td>
648 </tr>
649 </tbody>
650 </table>
652 <p>
653 For a keyframed animation, the <span class="prop-name">'animation-timing-function'</span> applies
654 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 <span class="prop-name">'animation-timing-function'</span> defined within a keyframe block applies to that keyframe, otherwise the timing function specified for the animation is used.
655 </p>
657 <!-- ======================================================================================================= -->
658 <h3>
659 The <span class="prop-name">'animation-iteration-count'</span> Property
660 </h3>
661 <p>
662 The <span class="prop-name">'animation-iteration-count'</span> property defines the number of times an animation cycle is played. The default value is one, meaning the animation will play from beginning to end once. A value of <span class="prop-value">'infinite'</span> will cause the animation to repeat forever. Non-integer numbers will cause the animation to end part-way through a cycle. Negative values of <span class="prop-name">'animation-iteration-count'</span> are invalid. This property is often used with an <span class="prop-name">'animation-direction'</span> value of <span class="prop-value">'alternate'</span>, which will cause the animation to play in reverse on alternate cycles.
663 </p>
664 <table class="propdef">
665 <tbody>
666 <tr>
667 <td>
668 <em>Name:</em>
669 </td>
670 <td>
671 <dfn id="animation-iteration-count">animation-iteration-count</dfn>
672 </td>
673 </tr>
674 <tr>
675 <td>
676 <em>Value:</em>
677 </td>
678 <td>
679 infinite | <number> [, infinite | <number>]*
680 </td>
681 </tr>
682 <tr>
683 <td>
684 <em>Initial:</em>
685 </td>
686 <td>
687 1
688 </td>
689 </tr>
690 <tr>
691 <td>
692 <em>Applies to:</em>
693 </td>
694 <td>
695 all elements, :before and :after pseudo elements
696 </td>
697 </tr>
698 <tr>
699 <td>
700 <em>Inherited:</em>
701 </td>
702 <td>
703 no
704 </td>
705 </tr>
706 <tr>
707 <td>
708 <em>Percentages:</em>
709 </td>
710 <td>
711 N/A
712 </td>
713 </tr>
714 <tr>
715 <td>
716 <em>Media:</em>
717 </td>
718 <td>
719 visual
720 </td>
721 </tr>
722 <tr>
723 <td>
724 <em>Computed value:</em>
725 </td>
726 <td>
727 Same as specified value.
728 </td>
729 </tr>
730 </tbody>
731 </table><!-- ======================================================================================================= -->
732 <h3>
733 The <span class="prop-name">'animation-direction'</span> Property
734 </h3>
735 <p>
736 The <span class="prop-name">'animation-direction'</span> property defines whether or not the animation should play in reverse on alternate cycles. If <span class="prop-value">'alternate'</span> 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.
737 </p>
738 <table class="propdef">
739 <tbody>
740 <tr>
741 <td>
742 <em>Name:</em>
743 </td>
744 <td>
745 <dfn id="animation-direction">animation-direction</dfn>
746 </td>
747 </tr>
748 <tr>
749 <td>
750 <em>Value:</em>
751 </td>
752 <td>
753 normal | alternate [, normal | alternate]*
754 </td>
755 </tr>
756 <tr>
757 <td>
758 <em>Initial:</em>
759 </td>
760 <td>
761 normal
762 </td>
763 </tr>
764 <tr>
765 <td>
766 <em>Applies to:</em>
767 </td>
768 <td>
769 all elements, :before and :after pseudo elements
770 </td>
771 </tr>
772 <tr>
773 <td>
774 <em>Inherited:</em>
775 </td>
776 <td>
777 no
778 </td>
779 </tr>
780 <tr>
781 <td>
782 <em>Percentages:</em>
783 </td>
784 <td>
785 N/A
786 </td>
787 </tr>
788 <tr>
789 <td>
790 <em>Media:</em>
791 </td>
792 <td>
793 visual
794 </td>
795 </tr>
796 <tr>
797 <td>
798 <em>Computed value:</em>
799 </td>
800 <td>
801 Same as specified value.
802 </td>
803 </tr>
804 </tbody>
805 </table><!-- ======================================================================================================= -->
806 <h3>
807 The <span class="prop-name">'animation-play-state'</span> Property
808 </h3>
810 <p>
811 The <span class="prop-name">'animation-play-state'</span> property defines whether the animation is running or paused. A running animation can be paused by setting this property to <span class="prop-value">'paused'</span>. To continue running a paused animation this property can be set to <span class="prop-value">'running'</span>. 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.
812 </p>
813 <table class="propdef">
814 <tbody>
815 <tr>
816 <td>
817 <em>Name:</em>
818 </td>
819 <td>
820 <dfn id="animation-play-state">animation-play-state</dfn>
821 </td>
822 </tr>
823 <tr>
824 <td>
825 <em>Value:</em>
826 </td>
827 <td>
828 running | paused [, running | paused]*
829 </td>
830 </tr>
831 <tr>
832 <td>
833 <em>Initial:</em>
834 </td>
835 <td>
836 running
837 </td>
838 </tr>
839 <tr>
840 <td>
841 <em>Applies to:</em>
842 </td>
843 <td>
844 all elements, :before and :after pseudo elements
845 </td>
846 </tr>
847 <tr>
848 <td>
849 <em>Inherited:</em>
850 </td>
851 <td>
852 no
853 </td>
854 </tr>
855 <tr>
856 <td>
857 <em>Percentages:</em>
858 </td>
859 <td>
860 N/A
861 </td>
862 </tr>
863 <tr>
864 <td>
865 <em>Media:</em>
866 </td>
867 <td>
868 visual
869 </td>
870 </tr>
871 <tr>
872 <td>
873 <em>Computed value:</em>
874 </td>
875 <td>
876 Same as specified value.
877 </td>
878 </tr>
879 </tbody>
880 </table><!-- ======================================================================================================= -->
881 <h3>
882 The <span class="prop-name">'animation-delay'</span> Property
883 </h3>
884 <p>
885 The <span class="prop-name">'animation-delay'</span> property defines
886 when the animation will start. It allows an animation to begin
887 execution some time after it is applied. An <span
888 class="prop-name">'animation-delay'</span> value of '0s' means the
889 animation will execute as soon as it is applied. Otherwise, the value
890 specifies an offset from the moment the animation is applied, and the
891 animation will delay execution by that offset.
892 </p>
893 <p>
894 If the value for <span class="prop-name">'animation-delay'</span> is a
895 negative time offset then the animation will execute the moment it is
896 applied, but will appear to have begun execution at the specified
897 offset. That is, the animation will appear to begin part-way through
898 its play cycle. In the case where an animation has implied starting
899 values and a negative <span
900 class="prop-name">'animation-delay'</span>, the starting values are
901 taken from the moment the animation is applied.
902 </p>
903 <table class="propdef">
904 <tbody>
905 <tr>
906 <td>
907 <em>Name:</em>
908 </td>
909 <td>
910 <dfn id="animation-delay">animation-delay</dfn>
911 </td>
912 </tr>
913 <tr>
914 <td>
915 <em>Value:</em>
916 </td>
917 <td>
918 <time> [, <time>]*
919 </td>
920 </tr>
921 <tr>
922 <td>
923 <em>Initial:</em>
924 </td>
925 <td>
926 0s
927 </td>
928 </tr>
929 <tr>
930 <td>
931 <em>Applies to:</em>
932 </td>
933 <td>
934 all elements, :before and :after pseudo elements
935 </td>
936 </tr>
937 <tr>
938 <td>
939 <em>Inherited:</em>
940 </td>
941 <td>
942 no
943 </td>
944 </tr>
945 <tr>
946 <td>
947 <em>Percentages:</em>
948 </td>
949 <td>
950 N/A
951 </td>
952 </tr>
953 <tr>
954 <td>
955 <em>Media:</em>
956 </td>
957 <td>
958 visual
959 </td>
960 </tr>
961 <tr>
962 <td>
963 <em>Computed value:</em>
964 </td>
965 <td>
966 Same as specified value.
967 </td>
968 </tr>
969 </tbody>
970 </table><!-- ======================================================================================================= -->
971 <h3>
972 The <span class="prop-name">'animation-fill-mode'</span> Property
973 </h3>
974 <p>
975 The <span class="prop-name">'animation-fill-mode'</span> property defines
976 what values are applied by the animation outside the time it is executing.
977 By default, an animation will not affect property values between the
978 time it is applied (the <span class="prop-name">'animation-name'</span> property is
979 set on an element) and the time it begins execution (which is determined by
980 the <span class="prop-name">'animation-delay'</span> property). Also, by
981 default an animation does not affect property values after the animation
982 ends (determined by the <span class="prop-name">'animation-duration'</span> property).
983 The value of <span class="prop-name">'animation-fill-mode'</span> can
984 override this behavior.
985 </p>
986 <p>
987 If the value for <span class="prop-name">'animation-fill-mode'</span> is
988 <span class="prop-value">'backwards'</span>, then the animation will
989 apply the property values defined in its 0% or 'from' keyframe as soon
990 as the animation is applied, during the period defined by
991 <span class="prop-name">'animation-delay'</span>.
992 </p>
993 <p>
994 If the value for <span class="prop-name">'animation-fill-mode'</span>
995 is <span class="prop-value">'forwards'</span>, then the animation will
996 apply the property values defined in its last executing keyframe after
997 the final iteration of the animation, until the animation style is
998 removed. The last executing keyframe is the 'to' or '100%' keyframe,
999 unless the animation has <span
1000 class="prop-name">'animation-direction'</span> set to <span
1001 class="prop-value">'alternate'</span> and both a finite and even
1002 iteration count, in which case it is the 'from' or '0%' keyframe.
1003 </p>
1004 <p>
1005 If the value for <span class="prop-name">'animation-fill-mode'</span>
1006 is <span class="prop-value">'both'</span>, then the animation will
1007 follow the rules for both 'forwards' and 'backwards'. That is, it will
1008 extend the animation properties in both directions.
1009 </p>
1010 <table class="propdef">
1011 <tbody>
1012 <tr>
1013 <td>
1014 <em>Name:</em>
1015 </td>
1016 <td>
1017 <dfn id="animation-fill-mode">animation-fill-mode</dfn>
1018 </td>
1019 </tr>
1020 <tr>
1021 <td>
1022 <em>Value:</em>
1023 </td>
1024 <td>
1025 none | forwards | backwards | both [, none | forwards | backwards | both]*
1026 </td>
1027 </tr>
1028 <tr>
1029 <td>
1030 <em>Initial:</em>
1031 </td>
1032 <td>
1033 none
1034 </td>
1035 </tr>
1036 <tr>
1037 <td>
1038 <em>Applies to:</em>
1039 </td>
1040 <td>
1041 all elements, :before and :after pseudo elements
1042 </td>
1043 </tr>
1044 <tr>
1045 <td>
1046 <em>Inherited:</em>
1047 </td>
1048 <td>
1049 no
1050 </td>
1051 </tr>
1052 <tr>
1053 <td>
1054 <em>Percentages:</em>
1055 </td>
1056 <td>
1057 N/A
1058 </td>
1059 </tr>
1060 <tr>
1061 <td>
1062 <em>Media:</em>
1063 </td>
1064 <td>
1065 visual
1066 </td>
1067 </tr>
1068 <tr>
1069 <td>
1070 <em>Computed value:</em>
1071 </td>
1072 <td>
1073 Same as specified value.
1074 </td>
1075 </tr>
1076 </tbody>
1077 </table><!-- ======================================================================================================= -->
1078 <h3>
1079 The <span class="prop-name">'animation'</span> Shorthand Property
1080 </h3>
1081 <p>
1082 The <span class="prop-name">'animation'</span> shorthand property
1083 combines seven of the animation properties into a single property.
1084 </p>
1085 <p>
1086 Note that order is important in this property. The first value that can be
1087 parsed as a time is assigned to the animation-duration. The second value that
1088 can be parsed as a time is assigned to animation-delay.
1089 </p>
1090 <p class="issue">
1091 An alternative proposal is to accept the font shorthand approach of
1092 using a "/" character between the values of the same type. eg. 2s/4s would
1093 mean a duration of 2 seconds and a delay of 4 seconds.
1094 </p>
1095 <table class="propdef">
1096 <tbody>
1097 <tr>
1098 <td>
1099 <em>Name:</em>
1100 </td>
1101 <td>
1102 <dfn id="animation">animation</dfn>
1103 </td>
1104 </tr>
1105 <tr>
1106 <td>
1107 <em>Value:</em>
1108 </td>
1109 <td>
1110 [<animation-name> ||
1111 <animation-duration> ||
1112 <animation-timing-function> ||
1113 <animation-delay> ||
1114 <animation-iteration-count> ||
1115 <animation-direction> ||
1116 <animation-fill-mode>]
1117 [, [<animation-name> ||
1118 <animation-duration> ||
1119 <animation-timing-function> ||
1120 <animation-delay> ||
1121 <animation-iteration-count> ||
1122 <animation-direction> ||
1123 <animation-fill-mode>] ]*
1124 </td>
1125 </tr>
1126 <tr>
1127 <td>
1128 <em>Initial:</em>
1129 </td>
1130 <td>
1131 see individual properties
1132 </td>
1133 </tr>
1134 <tr>
1135 <td>
1136 <em>Applies to:</em>
1137 </td>
1138 <td>
1139 all elements, :before and :after pseudo elements
1140 </td>
1141 </tr>
1142 <tr>
1143 <td>
1144 <em>Inherited:</em>
1145 </td>
1146 <td>
1147 no
1148 </td>
1149 </tr>
1150 <tr>
1151 <td>
1152 <em>Percentages:</em>
1153 </td>
1154 <td>
1155 N/A
1156 </td>
1157 </tr>
1158 <tr>
1159 <td>
1160 <em>Media:</em>
1161 </td>
1162 <td>
1163 visual
1164 </td>
1165 </tr>
1166 <tr>
1167 <td>
1168 <em>Computed value:</em>
1169 </td>
1170 <td>
1171 Same as specified value.
1172 </td>
1173 </tr>
1174 </tbody>
1175 </table><!-- ======================================================================================================= -->
1176 <h2>
1177 Animation Events
1178 </h2>
1179 <p>
1180 Several animation related events are available through the <a
1181 href="http://www.w3.org/TR/DOM-Level-2-Events/events.html">DOM Event
1182 system</a>. The start and end of an animation, and the end of each
1183 iteration of an animation all generate DOM events. An element can have
1184 multiple properties being animated simultaneously. This can occur either
1185 with a single <span class="prop-name">animation-name</span> value with
1186 keyframes containing multiple properties, or with multiple <span
1187 class="prop-name">animation-name</span> values. For the purposes of
1188 events, each <span class="prop-name">animation-name</span> specifies a
1189 single animation. Therefore an event will be generated for each <span
1190 class="prop-name">animation-name</span> value and not necessarily for
1191 each property being animated.
1192 </p>
1193 <p>
1194 The time the animation has been running is sent with each event
1195 generated. This allows the event handler to determine the current
1196 iteration of a looping animation or the current position of an
1197 alternating animation. This time does not include any time the animation
1198 was in the <code>paused</code> play state.
1199 </p>
1200 <dl>
1201 <dt>
1202 <b>Interface <i><a id="Events-AnimationEvent" name='Events-AnimationEvent'>AnimationEvent</a></i></b>
1203 </dt>
1204 <dd>
1205 <p>
1206 The <code>AnimationEvent</code> interface provides specific contextual information associated with Animation events.
1207 </p>
1208 <dl>
1209 <dt>
1210 <br>
1211 <b>IDL Definition</b>
1212 </dt>
1213 <dd>
1214 <div class='idl-code'>
1215 <pre>
1216 interface AnimationEvent : Event {
1217 readonly attribute DOMString animationName;
1218 readonly attribute float elapsedTime;
1219 void initAnimationEvent(in DOMString typeArg,
1220 in boolean canBubbleArg,
1221 in boolean cancelableArg,
1222 in DOMString animationNameArg,
1223 in float elapsedTimeArg);
1224 };
1225 </pre>
1226 </div>
1227 </dd>
1228 <dt>
1229 <b>Attributes</b>
1230 </dt>
1231 <dd>
1232 <dl>
1233 <dt>
1234 <code class='attribute-name'><a id="Events-AnimationEvent-animationName" name='Events-AnimationEvent-animationName'>animationName</a></code> of type <code>DOMString</code>, readonly
1235 </dt>
1236 <dd>
1237 The value of the <span
1238 class="prop-name">animation-name</span> property of the
1239 animation that fired the event.
1240 </dd>
1241 </dl>
1242 <dl>
1243 <dt>
1244 <code class='attribute-name'><a id="Events-AnimationEvent-elapsedTime" name='Events-AnimationEvent-elapsedTime'>elapsedTime</a></code> of type <code>float</code>, readonly
1245 </dt>
1246 <dd>
1247 The amount of time the animation has been running, in
1248 seconds, when this event fired, excluding any time the
1249 animation was paused. For an "animationstart" event, the
1250 elapsedTime is zero unless there was a negative value for
1251 <span class="prop-name">animation-delay</span>, in which
1252 case the event will be fired with an elapsedTime of (-1 *
1253 delay).
1254 </dd>
1255 </dl>
1256 </dd>
1257 <dt>
1258 <b>Methods</b>
1259 </dt>
1260 <dd>
1261 <dl>
1262 <dt>
1263 <code class='method-name'><a id="Events-AnimationEvent-initAnimationEvent" name='Events-AnimtionEvent-initAnimationEvent'>initAnimationEvent</a></code>
1264 </dt>
1265 <dd>
1266 <div class='method'>
1267 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.
1268 <div class='parameters'>
1269 <b>Parameters</b>
1270 <div class='paramtable'>
1271 <dl>
1272 <dt>
1273 <code class='parameter-name'>typeArg</code> of type <code>DOMString</code>
1274 </dt>
1275 <dd>
1276 Specifies the event type.<br>
1277 </dd>
1278 <dt>
1279 <code class='parameter-name'>canBubbleArg</code> of type <code>boolean</code>
1280 </dt>
1281 <dd>
1282 Specifies whether or not the event can bubble.<br>
1283 </dd>
1284 <dt>
1285 <code class='parameter-name'>cancelableArg</code> of type <code>boolean</code>
1286 </dt>
1287 <dd>
1288 Specifies whether or not the event's default action can be prevented.
1289 </dd>
1290 <dt>
1291 <code class='parameter-name'>animationNameArg</code> of type <code>DOMString</code>
1292 </dt>
1293 <dd>
1294 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>
1295 </dd>
1296 <dt>
1297 <code class='parameter-name'>elapsedTimeArg</code> of type <code>float</code>
1298 </dt>
1299 <dd>
1300 Specifies the amount of time, in seconds, the animation has been running at the time of initialization.
1301 </dd>
1302 </dl>
1303 </div>
1304 </div><!-- parameters -->
1305 <div>
1306 <b>No Return Value</b>
1307 </div>
1308 <div>
1309 <b>No Exceptions</b>
1310 </div>
1311 </div><!-- method -->
1312 </dd>
1313 </dl>
1314 </dd>
1315 </dl>
1316 </dd>
1317 </dl>
1318 <p>
1319 The different types of Animation events that can occur are:
1320 </p>
1321 <dl>
1322 <dt>
1323 <b>animationstart</b>
1324 </dt>
1325 <dd>
1326 The 'animationstart' event occurs at the start of the animation. If there is an <span
1327 class="prop-name">animation-delay</span> then this event will fire once the delay period
1328 has expired. A negative delay will cause the event to fire with an elapsedTime equal to
1329 the absolute value of the delay.
1330 <ul>
1331 <li>Bubbles: Yes
1332 </li>
1333 <li>Cancelable: Yes
1334 </li>
1335 <li>Context Info: animationName
1336 </li>
1337 </ul>
1338 </dd>
1339 <dt>
1340 <b>animationend</b>
1341 </dt>
1342 <dd>
1343 The 'animationend' event occurs when the animation finishes.
1344 <ul>
1345 <li>Bubbles: Yes
1346 </li>
1347 <li>Cancelable: Yes
1348 </li>
1349 <li>Context Info: animationName, elapsedTime
1350 </li>
1351 </ul>
1352 </dd>
1353 <dt>
1354 <b>animationiteration</b>
1355 </dt>
1356 <dd>
1357 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.
1358 <ul>
1359 <li>Bubbles: Yes
1360 </li>
1361 <li>Cancelable: Yes
1362 </li>
1363 <li>Context Info: animationName, elapsedTime
1364 </li>
1365 </ul>
1366 </dd>
1367 </dl>
1368 <!-- ======================================================================================================= -->
1369 <h2>
1370 DOM Interfaces
1371 </h2>
1372 <p>
1373 CSS animation is exposed to the CSSOM through a pair of new interfaces
1374 describing the keyframes.
1375 </p>
1376 <dl>
1377 <dt>
1378 <b>Interface <i><a id="DOM-CSSRule" name='DOM-CSSRule'>CSSRule</a></i></b>
1379 </dt>
1380 <dd>
1381 <p>
1382 The following 2 rule types are added to the <code>CSSRule</code> interface. They provide identification for the new keyframe and keyframes rules.
1383 </p>
1384 <dl>
1386 <dt>
1387 <b>IDL Definition</b>
1388 </dt>
1389 <dd>
1390 <div class='idl-code'>
1391 <pre>
1392 interface CSSRule {
1393 ...
1394 const unsigned short KEYFRAMES_RULE = 7;
1395 const unsigned short KEYFRAME_RULE = 8;
1396 ...
1397 };</pre>
1398 </div>
1399 </dd> <!-- IDL -->
1400 </dl>
1401 </dd>
1403 <dt>
1404 <b>Interface <i><a id="DOM-CSSKeyframeRule" name='DOM-CSSKeyframeRule'>CSSKeyframeRule</a></i></b>
1405 </dt>
1406 <dd>
1407 <p>
1408 The <code>CSSKeyframeRule</code> interface represents the style rule for a single key.
1409 </p>
1410 <dl>
1411 <dt>
1412 <br>
1413 <b>IDL Definition</b>
1414 </dt>
1415 <dd>
1416 <div class='idl-code'>
1417 <pre>
1418 interface CSSKeyframeRule : CSSRule {
1419 attribute DOMString keyText;
1420 readonly attribute CSSStyleDeclaration style;
1421 };
1422 </pre>
1423 </div><br>
1424 </dd>
1425 <dt>
1426 <b>Attributes</b>
1427 </dt>
1428 <dd>
1429 <dl>
1430 <dt>
1431 <code class='attribute-name'><a id="DOM-CSSKeyframeRule-keyText" name='DOM-CSSKeyframeRule-keyText'>keyText</a></code> of type <code>DOMString</code>
1432 </dt>
1433 <dd>
1434 This attribute represents the key as the string representation of a floating point number between 0 and 1. If the value
1435 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
1436 value will be 1.<br>
1437 </dd>
1438 </dl>
1439 </dd>
1440 <dd>
1441 <dl>
1442 <dt>
1443 <code class='attribute-name'><a id="DOM-CSSKeyframeRule-style" name='DOM-CSSKeyframeRule-style'>style</a></code> of type <code>CSSStyleDeclaration</code>
1444 </dt>
1445 <dd>
1446 This attribute represents the style associated with this keyframe.<br>
1447 </dd>
1448 </dl>
1449 </dd>
1450 <dt>
1451 <b>No Methods</b>
1452 </dt>
1453 </dl>
1454 </dd>
1455 </dl>
1456 <dl>
1457 <dt>
1458 <b>Interface <i><a id="DOM-CSSKeyframesRule" name='DOM-CSSKeyframesRule'>CSSKeyframesRule</a></i></b>
1459 </dt>
1460 <dd>
1461 <p>
1462 The <code>CSSKeyframesRule</code> interface represents a complete set of keyframes for a single animation.
1463 </p>
1464 <dl>
1465 <dt>
1466 <br>
1467 <b>IDL Definition</b>
1468 </dt>
1469 <dd>
1470 <div class='idl-code'>
1471 <pre>
1472 interface CSSKeyframesRule : CSSRule {
1473 attribute DOMString name;
1474 readonly attribute CSSRuleList cssRules;
1476 void appendRule(in DOMString rule);
1477 void deleteRule(in DOMString key);
1478 CSSKeyframeRule findRule(in DOMString key);
1479 };
1480 </pre>
1481 </div><br>
1482 </dd>
1483 <dt>
1484 <b>Attributes</b>
1485 </dt>
1486 <dd>
1487 <dl>
1488 <dt>
1489 <code class='attribute-name'><a id="DOM-CSSKeyframesRule-name" name='DOM-CSSKeyframesRule-name'>name</a></code> of type <code>DOMString</code>
1490 </dt>
1491 <dd>
1492 This attribute is the name of the keyframes, used by the <code>animation-name</code> property.<br>
1493 </dd>
1494 </dl>
1495 </dd>
1496 <dd>
1497 <dl>
1498 <dt>
1499 <code class='attribute-name'><a id="DOM-CSSKeyframeRules-cssRules" name='DOM-CSSKeyframeRules-cssRules'>cssRules</a></code> of type <code>CSSRuleList</code>
1500 </dt>
1501 <dd>
1502 This attribute gives access to the keyframes in the list.<br>
1503 </dd>
1504 </dl>
1505 </dd>
1506 <dt>
1507 <b>Methods</b>
1508 <dd>
1509 <dl>
1510 <!-- ======================================================================================================= -->
1511 <dt>
1512 <code class='method-name'><a id="DOM-CSSKeyframesRule-appendRule" name='DOM-CSSKeyframesRule-appendRule'>appendRule</a></code>
1513 </dt>
1514 <dd>
1515 <div class='method'>
1516 The <code>appendRule</code> method appends the passed CSSKeyframeRule into the list at the passed key.
1517 <div class='parameters'>
1518 <b>Parameters</b>
1519 <div class='paramtable'>
1520 <dl>
1521 <dt>
1522 <code class='parameter-name'>rule</code> of type <code>DOMString</code>
1523 </dt>
1524 <dd>
1525 The rule to be appended, expressed in the same syntax as one entry in the
1526 <code>@keyframes</code> rule.
1527 </dd>
1528 </dl>
1529 </div>
1530 </div><!-- parameters -->
1531 <div class='return-value'>
1532 <b>No Return Value</b>
1533 </div>
1534 <div>
1535 <b>No Exceptions</b>
1536 </div>
1537 </div><!-- ======================================================================================================= -->
1538 </dd>
1539 <dt>
1540 <code class='method-name'><a id="DOM-CSSKeyframesRule-deleteRule" name='DOM-CSSKeyframesRule-deleteRule'>deleteRule</a></code>
1541 </dt>
1542 <dd>
1543 <div class='method'>
1544 The <code>deleteRule</code> method deletes the CSSKeyframeRule with the passed key. If a rule with this key
1545 does not exist, the method does nothing.
1546 <div class='parameters'>
1547 <b>Parameters</b>
1548 <div class='paramtable'>
1549 <dl>
1550 <dt>
1551 <code class='parameter-name'>key</code> of type <code>DOMString</code>
1552 </dt>
1553 <dd>
1554 The key which describes the rule to be deleted. The key must
1555 resolve to a number between 0 and 1, or the rule is ignored.<br>
1556 </dd>
1557 </dl>
1558 </div>
1559 </div><!-- parameters -->
1560 <div class='return-value'>
1561 <b>No Return Value</b>
1562 </div>
1563 <div>
1564 <b>No Exceptions</b>
1565 </div>
1566 </div><!-- ======================================================================================================= -->
1567 </dd>
1568 <dt>
1569 <code class='method-name'><a id="DOM-CSSKeyframesRule-findRule" name='DOM-CSSKeyframesRule-findRule'>findRule</a></code>
1570 </dt>
1571 <dd>
1572 <div class='method'>
1573 The <code>findRule</code> method returns the rule with a key matching the passed key. If no such rule
1574 exists, a null value is returned.
1575 <div class='parameters'>
1576 <b>Parameters</b>
1577 <div class='paramtable'>
1578 <dl>
1579 <dt>
1580 <code class='parameter-name'>key</code> of type <code>DOMString</code>
1581 </dt>
1582 <dd>
1583 The key which described the rule to find. The key must
1584 resolve to a number between 0 and 1, or the rule is ignored.<br>
1585 </dd>
1586 </dl>
1587 </div>
1588 </div><!-- parameters -->
1589 <div class='return-value'>
1590 <b>Return Value</b>
1591 <div class='returnvalue'>
1592 <dl>
1593 <dt>
1594 <code>CSSKeyframeRule</code>
1595 </dt>
1596 <dd>
1597 The found rule.<br>
1598 </dd>
1599 </dl>
1600 </div>
1601 </div>
1602 <div>
1603 <b>No Exceptions</b>
1604 </div>
1605 </div><!-- ======================================================================================================= -->
1606 </dd>
1607 </dl><!-- method -->
1608 </dd>
1609 </dt>
1610 </dl>
1611 </dd>
1612 </dl>
1614 <h2>References</h2>
1616 <h3 class="no-num">Normative references</h3>
1617 <!--normative-->
1619 <h3 class="no-num">Other references</h3>
1620 <!--informative-->
1624 <h2 class="no-num">Property index</h2>
1625 <!-- properties -->
1629 <h2 class="no-num" id="index">Index</h2>
1630 <!--index-->
1632 </body>
1633 </html>
1634 <!-- Keep this comment at the end of the file
1635 Local variables:
1636 mode: sgml
1637 sgml-default-doctype-name:"html"
1638 sgml-minimize-attributes:t
1639 End:
1640 -->
