css3-animations/Overview.src.html@e44608181b73
css3-animations/Overview.src.html
Tue, 10 Apr 2012 16:34:56 -0700
- author
- Sylvain Galineau <sylvaing@microsoft.com>
- date
- Tue, 10 Apr 2012 16:34:56 -0700
- changeset 5444
- e44608181b73
- parent 5427
- 0da4dbf93293
- child 5911
- 27544a0821fd
- permissions
- -rw-r--r--
Resolution for bug 14659 - animationiteration event and last iteration
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 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
8 <link rel="stylesheet" type="text/css" href="../default.css">
9 <link rel="stylesheet" type="text/css" href="http://www.w3.org/StyleSheets/TR/W3C-ED.css">
10 </head>
12 <body>
14 <div class="head">
15 <!--logo-->
17 <h1>CSS Animations</h1>
19 <h2 class="no-num no-toc">[LONGSTATUS] [DATE]</h2>
20 <dl>
21 <dt>This version:
22 <dd><a href="[VERSION]">http://dev.w3.org/csswg/css3-animations/</a>
23 <!--http://www.w3.org/TR/[YEAR]/WD-[SHORTNAME]-[CDATE]/-->
24 <dt>Latest version:
25 <dd><a
26 href="http://www.w3.org/TR/css3-animations/">[LATEST]</a>
27 <dt>Editor's draft:
28 <dd><a href="http://dev.w3.org/csswg/[SHORTNAME]/">http://dev.w3.org/csswg/[SHORTNAME]/</a>
30 <dt>Previous version:
31 <dd><a href="http://www.w3.org/TR/2012/WD-css3-animations-20120403/">
32 http://www.w3.org/TR/2012/WD-css3-animations-20120403/</a>
33 <dt id="editors-list">Editors:
34 <dd><a href="mailto:dino@apple.com">Dean Jackson</a> (<a
35 href="http://www.apple.com/">Apple Inc</a>)
36 <dd><a href="mailto:hyatt@apple.com">David Hyatt</a> (<a
37 href="http://www.apple.com/">Apple Inc</a>)
38 <dd><a href="mailto:cmarrin@apple.com">Chris Marrin</a> (<a
39 href="http://www.apple.com/">Apple Inc</a>)
40 <dd><a href="mailto:sylvaing@microsoft.com">Sylvain Galineau</a>
41 (<a class=org href="http://www.microsoft.com/">Microsoft</a>)
42 <dd class=vcard><a class=fn href="http://dbaron.org/">L. David Baron</a>
43 (<a class=org href="http://www.mozilla.org/">Mozilla</a>)
45 <dt>Issues list:
46 <dd><a href="https://www.w3.org/Bugs/Public/buglist.cgi?query_format=advanced&product=CSS&component=Animations&resolution=---&cmdtype=doit">in Bugzilla</a>
48 <dt>Discussion:</dt>
49 <dd><a href="http://lists.w3.org/Archives/Public/www-style/">www-style@w3.org</a> with subject line “<kbd>[[SHORTNAME]] <var>… message topic …</var></kbd>”
51 <dt>Test suite:
52 <dd>none yet
53 </dl>
55 <!--copyright-->
57 <hr title="Separator for header">
58 </div>
60 <h2 class="no-num no-toc" id="abstract">Abstract</h2>
62 <p>This CSS module describes a way for authors to animate the values of CSS properties over time, using keyframes.
63 The behavior of these keyframe animations can be controlled by specifying their duration, number of repeats,
64 and repeating behavior.
65 </p>
67 <h2 class="no-num no-toc" id="status">Status of this document</h2>
68 <!--status-->
71 <h2 class="no-num no-toc" id="contents">Table of contents</h2>
72 <!--toc-->
75 <h2 id="introduction">Introduction</h2>
77 <p><em>This section is not normative.</em>
79 <p>
80 CSS Transitions [[!CSS3-TRANSITIONS]] provide a way to interpolate CSS property values
81 when they change as a result of underlying property changes. This provides an easy way to do simple animation,
82 but the start and end states of the animation are controlled by the existing property values,
83 and transitions provide little control to the author on how the animation progresses.
84 </p>
85 <p>
86 This proposal introduces <em>defined animations</em>, in which the author can
87 specify the changes in CSS properties over time as a set of keyframes. Animations are similar to transitions
88 in that they change the presentational value of CSS properties over time.
89 The principal difference is that while transitions trigger <i>implicitly</i> when property values change, animations
90 are <i>explicitly</i> executed when the animation properties are applied. Because of this, animations require explicit
91 values for the properties being animated. These values are specified using animation keyframes, described below.
92 </p>
93 <p>
94 Many aspects of the animation can be controlled, including how many times the animation iterates, whether or not
95 it alternates between the begin and end values, and whether or not the animation should be running or paused.
96 An animation can also delay its start time.
97 </p>
99 <h2 id="animations">Animations</h2>
101 <p>
102 CSS Animations affect computed property values. During the execution of an animation, the
103 computed value for a property is controlled by the animation. This overrides the value
104 specified in the normal styling system.
105 </p>
107 <p>
108 If at one point in time there are multiple animations specifying behavior
109 for the same property, the animation whose name occurs last in the value
110 of 'animation-name' will override the other animations at that point.
111 </p>
113 <p>
114 An animation does not affect the computed value before the application of the animation,
115 before the animation delay has expired, and after the end of the animation.
116 </p>
118 <div class="figure">
119 <img src="sandwich.png" alt="">
120 </div>
121 <p class="caption">
122 Computation of animated property values
123 </p>
125 <p>
126 The diagram above shows how property values are computed. The intrinsic style is shown at the
127 top of the diagram. The computed value is derived from intrinsic style at the times when an
128 animation is not running and also when an animation is delayed (see below for specification of
129 animation delay). During an animation, the computed style is derived from the animated value.
130 </p>
132 <p>
133 The start time of an animation is the latter of two moments: the time at which the style is
134 resolved that specifies the animation, or the time the document's load event is fired.
135 Therefore, an animation specified in the document style sheet will begin at the document load.
136 An animation specified on an element by modifying the style after the document has loaded will
137 start when the style is resolved. That may be immediately in the case of a pseudo style rule
138 such as hover, or may be when the scripting engine returns control to the browser (in the case
139 of style applied by script).
140 </p>
142 <p>
143 An animation applies to an element if the element has a value for
144 <code class="property">'animation-name'</code> that references a valid
145 keyframes rule. Once an animation has started it continues until it ends
146 or the <code class="property">'animation-name'</code> is removed. The values
147 used for the keyframes and animation properties are snapshotted at the
148 time the animation starts. Changing them during the execution of the
149 animation has no effect. Note also, that changing the value of
150 <code class="property">'animation-name'</code> does not necessarily
151 restart an animation (e.g., if a list of animations are applied and
152 one is removed from the list, only that animation will stop; The other
153 animations will continue). In order to restart an animation, it must be
154 removed then reapplied.
155 </p>
157 <p>
158 The end of the animation is defined by the combination of the
159 <code class="property">'animation-duration'</code>,
160 <code class="property">'animation-iteration-count'</code> and
161 <code class="property">'animation-fill-mode'</code> properties.
162 </p>
164 <div class="example">
165 <p style="display:none">
166 Example(s):
167 </p>
168 <pre>
169 div {
170 animation-name: diagonal-slide;
171 animation-duration: 5s;
172 animation-iteration-count: 10;
173 }
175 @keyframes diagonal-slide {
177 from {
178 left: 0;
179 top: 0;
180 }
182 to {
183 left: 100px;
184 top: 100px;
185 }
187 }
189 </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).
190 </div>
192 <h2>Keyframes</h2>
193 <p>
194 Keyframes are used to specify the values for the animating properties at various points
195 during the animation. The keyframes specify the behavior of one cycle of the animation;
196 the animation may iterate one or more times.
197 </p>
198 <p>
199 Keyframes are specified using a specialized CSS at-rule. A <code
200 class="property">@keyframes</code> rule consists of the keyword
201 "@keyframes", followed by an identifier giving a name for the animation
202 (which will be referenced using <code class="property">'animation-name'</code>),
203 followed by a set of style rules (delimited by curly braces).
204 </p>
205 <p>
206 The <i>keyframe selector</i> for a keyframe style rule consists of a
207 comma-separated list of percentage values or the keywords 'from' or
208 'to'. The selector is used to specify the percentage along the duration
209 of the animation that the keyframe represents. The
210 keyframe itself is specified by the block of property values declared on
211 the selector. The keyword 'from' is equivalent to the value 0%. The
212 keyword 'to' is equivalent to the value 100%. Note that the percentage
213 unit specifier must be used on percentage values. Therefore, "0" is an
214 invalid keyframe selector.
215 </p>
216 <p>
217 If a 0% or "from" keyframe is not specified, then the user agent
218 constructs a 0% keyframe using the computed values of the properties
219 being animated. If a 100% or "to" keyframe is not specified, then the user agent
220 constructs a 100% keyframe using the computed values of the properties
221 being animated.
222 </p>
223 <p>
224 The <i>keyframe declaration</i> for a keyframe rule consists of
225 properties and values. Properties that are unable to be
226 animated are ignored in these rules, with the exception of <code
227 class="property">'animation-timing-function'</code>, the behavior
228 of which is described below.
229 </p>
230 <p class="note">
231 NOTE: describe what happens if a property is not present in all keyframes.
232 </p>
233 <p>
234 The @keyframes rule that is used by an animation will be the last one encountered in sorted rules order
235 that matches the name of the animation specified by the <code class="property">'animation-name'</code> property.
236 <code class="css">@keyframes</code> rules do not cascade;
237 therefore an animation will never derive keyframes from more than one <code class="css">@keyframes</code> rule.
238 </p>
239 <p>
240 To determine the set of keyframes, all of the values in the selectors are sorted in increasing order by time.
241 If there are any duplicates, then the last keyframe specified inside the <code class="css">@keyframes</code> rule
242 will be used to provide the keyframe information for that time. There is no cascading within a
243 <code class="css">@keyframes</code> rule if multiple keyframes specify the same keyframe selector values.
244 </p>
245 <p>
246 If property is not specified for a keyframe, or is specified but invalid, the animation of that property proceeds
247 as if that keyframe did not exist. Conceptually, it is as if a set of keyframes is constructed for each property
248 that is present in any of the keyframes, and an animation is run independently for each property.
249 </p>
250 <div class="example">
251 <p style="display:none">
252 Example(s):
253 </p>
254 <pre>
255 @keyframes wobble {
256 0% {
257 left: 100px;
258 }
260 40% {
261 left: 150px;
262 }
264 60% {
265 left: 75px;
266 }
268 100% {
269 left: 100px;
270 }
271 }
273 </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.
274 <div class="figure">
275 <img src="animation1.png" alt="">
276 </div>
277 <p class="caption">
278 Animations states specified by keyframes
279 </p>
280 </div>
282 <p>
283 The following is the grammar for the keyframes rule.
284 </p>
286 <pre>
288 keyframes_rule: KEYFRAMES_SYM S+ IDENT S* '{' S* keyframes_blocks '}' S*;
290 keyframes_blocks: [ keyframe_selector '{' S* declaration? [ ';' S* declaration? ]* '}' S* ]* ;
292 keyframe_selector: [ FROM_SYM | TO_SYM | PERCENTAGE ] S* [ ',' S* [ FROM_SYM | TO_SYM | PERCENTAGE ] S* ]*;
294 @{K}{E}{Y}{F}{R}{A}{M}{E}{S} {return KEYFRAMES_SYM;}
295 {F}{R}{O}{M} {return FROM_SYM;}
296 {T}{O} {return TO_SYM;}
297 </pre>
298 <!-- ======================================================================================================= -->
299 <h3 id="timing-functions"><a id="timing-functions-for-keyframes-">
300 Timing functions for keyframes
301 </a></h3>
302 <p>
303 A keyframe style rule may also declare the timing function that is to be used as the animation moves to the next keyframe.
304 </p>
305 <div class="example">
306 <p style="display:none">
307 Example(s):
308 </p>
309 <pre>
310 @keyframes bounce {
312 from {
313 top: 100px;
314 animation-timing-function: ease-out;
315 }
317 25% {
318 top: 50px;
319 animation-timing-function: ease-in;
320 }
322 50% {
323 top: 100px;
324 animation-timing-function: ease-out;
325 }
327 75% {
328 top: 75px;
329 animation-timing-function: ease-in;
330 }
332 to {
333 top: 100px;
334 }
336 }
338 </pre>Five keyframes are specified for the animation named "bounce". Between the first and second keyframe (i.e., between 0% and 25%) an "ease-out" timing function is used. Between the second and third keyframe (i.e., 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
339 </div>
340 <p>
341 See <a href="#animation-timing-function_tag">the <code class="property">'animation-timing-function'</code>
342 property</a> for more information.
343 </p><!-- ======================================================================================================= -->
345 <!-- ======================================================================================================= -->
346 <h3 id="animation-name-property"><a id="the-animation-name-property-">
347 The <code class="property">'animation-name'</code> Property
348 </a></h3>
349 <p>
350 The <code class="property">'animation-name'</code> property defines a
351 list of animations that apply. Each name is used to select the keyframe at-rule
352 that provides the property values for the animation. If the name does
353 not match any keyframe at-rule, there are no properties to be animated
354 and the animation will not execute. Furthermore, if the animation name
355 is 'none' then there will be no animation. This can be used to override
356 any animations coming from the cascade. If animations are attempting to
357 modify the same property, then the animation closest to the end of the
358 list of names wins.
359 </p>
360 <p id="list-matching">
361 Each animation listed by name should have a corresponding value
362 for the other animation properties listed below. In the case where the
363 lists of values for the other animation properties do not have
364 the same length, the length of the 'animation-name' list
365 determines the number of items in each list examined when
366 starting transitions. The lists are matched up from the first
367 value: excess values at the end are not used. If one of the
368 other properties doesn't have enough comma-separated values to
369 match the number of values of 'animation-name', the UA must
370 calculate its used value by repeating the list of values until
371 there are enough. This truncation or repetition does not affect
372 the computed value.
373 <span class="note">
374 Note: This is analogous to the behavior of the 'background-*'
375 properties, with 'background-image' analogous to
376 'animation-name'.
377 </span>
378 </p>
380 <table class="propdef">
381 <tbody>
382 <tr>
383 <td>
384 <em>Name:</em>
385 </td>
386 <td>
387 <dfn id="animation-name">animation-name</dfn>
388 </td>
389 </tr>
390 <tr>
391 <td>
392 <em>Value:</em>
393 </td>
394 <td>
395 [ none | <IDENT> ] [, [ none | <IDENT> ] ]*
396 </td>
397 </tr>
398 <tr>
399 <td>
400 <em>Initial:</em>
401 </td>
402 <td>
403 none
404 </td>
405 </tr>
406 <tr>
407 <td>
408 <em>Applies to:</em>
409 </td>
410 <td>
411 all elements, :before and :after pseudo elements
412 </td>
413 </tr>
414 <tr>
415 <td>
416 <em>Inherited:</em>
417 </td>
418 <td>
419 no
420 </td>
421 </tr>
422 <tr>
423 <td>
424 <em>Percentages:</em>
425 </td>
426 <td>
427 N/A
428 </td>
429 </tr>
430 <tr>
431 <td>
432 <em>Media:</em>
433 </td>
434 <td>
435 visual
436 </td>
437 </tr>
438 <tr>
439 <td>
440 <em>Computed value:</em>
441 </td>
442 <td>
443 Same as specified value.
444 </td>
445 </tr>
446 </tbody>
447 </table>
449 <!--
450 <p>
451 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.
452 </p>
453 <div class="example">
454 <p style="display:none">
455 Example(s):
456 </p>
457 <pre>
458 @keyframes 'border-bloat' {
459 from {
460 border-width: 0;
461 }
462 to {
463 border-width: 10px;
464 }
465 }
467 @keyframes 'border-diet' {
468 from {
469 border-width: 4px;
470 }
471 to {
472 border-width: 2px;
473 }
474 }
476 div {
477 animation-name: 'border-bloat', 'border-diet';
478 animation-duration: 10s, 4s;
479 }
480 </pre>
481 <p>
482 The above example has two animations executing on the same property, <code class="property">'border-width'</code>. The animations are additive. That is, the
483 resulting value for the property will be the addition of the values from the
484 two animations.
485 </p>
486 <p>
487 At time '0s' the element's border will be 4px wide (0px from 'border-bloat' plus 4px from 'border-diet').
488 At time '4s' the element's border will be 6px wide (4px from 'border-bloat' plus 2px from 'border-diet').
489 At time '10s' the element's border will be 10px wide (10px from 'border-bloat' and no addition from
490 'border-diet' as it is no longer executing).
491 </p>
492 </div>
493 -->
496 <!-- ======================================================================================================= -->
497 <h3 id="animation-duration-property"><a id="the-animation-duration-property-">
498 The <code class="property">'animation-duration'</code> Property
499 </a></h3>
500 <p>
501 The <code class="property">'animation-duration'</code> property defines the length of time that an animation takes to complete one cycle.
502 </p>
503 <table class="propdef">
504 <tbody>
505 <tr>
506 <td>
507 <em>Name:</em>
508 </td>
509 <td>
510 <dfn id="animation-duration">animation-duration</dfn>
511 </td>
512 </tr>
513 <tr>
514 <td>
515 <em>Value:</em>
516 </td>
517 <td>
518 <time> [, <time>]*
519 </td>
520 </tr>
521 <tr>
522 <td>
523 <em>Initial:</em>
524 </td>
525 <td>
526 0s
527 </td>
528 </tr>
529 <tr>
530 <td>
531 <em>Applies to:</em>
532 </td>
533 <td>
534 all elements, :before and :after pseudo elements
535 </td>
536 </tr>
537 <tr>
538 <td>
539 <em>Inherited:</em>
540 </td>
541 <td>
542 no
543 </td>
544 </tr>
545 <tr>
546 <td>
547 <em>Percentages:</em>
548 </td>
549 <td>
550 N/A
551 </td>
552 </tr>
553 <tr>
554 <td>
555 <em>Media:</em>
556 </td>
557 <td>
558 visual
559 </td>
560 </tr>
561 <tr>
562 <td>
563 <em>Computed value:</em>
564 </td>
565 <td>
566 Same as specified value.
567 </td>
568 </tr>
569 </tbody>
570 </table>
572 <p>
573 By default the value is '0s', meaning that the animation cycle is
574 immediate. A negative value for <code
575 class="property">'animation-duration'</code> is treated as '0s'. In this
576 case <code class="property">'animation-fill-mode'</code> still applies,
577 so an animation that fills backwards will show the value of the 0%
578 keyframe during any delay period, and an animation that fill forwards
579 will retain the value specified at the 100% keyframe, even if the
580 animation was instantaneous. Also, animation events are still fired.
581 </p>
583 <!-- ======================================================================================================= -->
584 <h3 id="animation-timing-function-property"><a id="animation-timing-function_tag">
585 The <code class="property">'animation-timing-function'</code> Property
586 </a></h3>
587 <p>
588 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.
589 </p>
590 <table class="propdef">
591 <tbody>
592 <tr>
593 <td>
594 <em>Name:</em>
595 </td>
596 <td>
597 <dfn id="animation-timing-function">animation-timing-function</dfn>
598 </td>
599 </tr>
600 <tr>
601 <td>
602 <em>Value:</em>
603 </td>
604 <td>
605 [ 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>)] ]*
606 </td>
607 </tr>
608 <tr>
609 <td>
610 <em>Initial:</em>
611 </td>
612 <td>
613 ease
614 </td>
615 </tr>
616 <tr>
617 <td>
618 <em>Applies to:</em>
619 </td>
620 <td>
621 all elements, :before and :after pseudo elements
622 </td>
623 </tr>
624 <tr>
625 <td>
626 <em>Inherited:</em>
627 </td>
628 <td>
629 no
630 </td>
631 </tr>
632 <tr>
633 <td>
634 <em>Percentages:</em>
635 </td>
636 <td>
637 N/A
638 </td>
639 </tr>
640 <tr>
641 <td>
642 <em>Media:</em>
643 </td>
644 <td>
645 visual
646 </td>
647 </tr>
648 <tr>
649 <td>
650 <em>Computed value:</em>
651 </td>
652 <td>
653 Same as specified value.
654 </td>
655 </tr>
656 </tbody>
657 </table>
659 <p>
660 For a keyframed animation, the <code class="property">'animation-timing-function'</code> applies
661 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.
662 </p>
664 <!-- ======================================================================================================= -->
665 <h3 id="animation-iteration-count-property"><a id="the-animation-iteration-count-property-">
666 The <code class="property">'animation-iteration-count'</code> Property
667 </a></h3>
668 <p>
669 The <code class="property">'animation-iteration-count'</code> property defines the number of times
670 an animation cycle is played. The default value is one, meaning the animation will play from
671 beginning to end once. A value of <code class="css">'infinite'</code> will cause the animation to
672 repeat forever. Non-integer numbers will cause the animation to end part-way through a cycle.
673 Negative values of <code class="property">'animation-iteration-count'</code> are invalid.
674 This property is often used with an <code class="property">'animation-direction'</code> value of
675 <code class="css">alternate</code>, which will cause the animation to play in reverse on alternate cycles.
676 </p>
677 <table class="propdef">
678 <tbody>
679 <tr>
680 <td>
681 <em>Name:</em>
682 </td>
683 <td>
684 <dfn id="animation-iteration-count">animation-iteration-count</dfn>
685 </td>
686 </tr>
687 <tr>
688 <td>
689 <em>Value:</em>
690 </td>
691 <td>
692 [ infinite | <number> ] [, [ infinite | <number> ] ]*
693 </td>
694 </tr>
695 <tr>
696 <td>
697 <em>Initial:</em>
698 </td>
699 <td>
700 1
701 </td>
702 </tr>
703 <tr>
704 <td>
705 <em>Applies to:</em>
706 </td>
707 <td>
708 all elements, :before and :after pseudo elements
709 </td>
710 </tr>
711 <tr>
712 <td>
713 <em>Inherited:</em>
714 </td>
715 <td>
716 no
717 </td>
718 </tr>
719 <tr>
720 <td>
721 <em>Percentages:</em>
722 </td>
723 <td>
724 N/A
725 </td>
726 </tr>
727 <tr>
728 <td>
729 <em>Media:</em>
730 </td>
731 <td>
732 visual
733 </td>
734 </tr>
735 <tr>
736 <td>
737 <em>Computed value:</em>
738 </td>
739 <td>
740 Same as specified value.
741 </td>
742 </tr>
743 </tbody>
744 </table><!-- ======================================================================================================= -->
745 <h3 id="animation-direction-property"><a id="the-animation-direction-property-">
746 The <code class="property">'animation-direction'</code> Property
747 </a></h3>
748 <p>
749 The <code class="property">'animation-direction'</code> property defines whether or not the animation should play in reverse on some or all cycles. 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.
750 </p>
751 <table class="propdef">
752 <tbody>
753 <tr>
754 <td>
755 <em>Name:</em>
756 </td>
757 <td>
758 <dfn id="animation-direction">animation-direction</dfn>
759 </td>
760 </tr>
761 <tr>
762 <td>
763 <em>Value:</em>
764 </td>
765 <td>
766 [ normal | reverse | alternate | alternate-reverse ] [, [ normal | reverse | alternate | alternate-reverse ] ]*
767 </td>
768 </tr>
769 <tr>
770 <td>
771 <em>Initial:</em>
772 </td>
773 <td>
774 normal
775 </td>
776 </tr>
777 <tr>
778 <td>
779 <em>Applies to:</em>
780 </td>
781 <td>
782 all elements, :before and :after pseudo elements
783 </td>
784 </tr>
785 <tr>
786 <td>
787 <em>Inherited:</em>
788 </td>
789 <td>
790 no
791 </td>
792 </tr>
793 <tr>
794 <td>
795 <em>Percentages:</em>
796 </td>
797 <td>
798 N/A
799 </td>
800 </tr>
801 <tr>
802 <td>
803 <em>Media:</em>
804 </td>
805 <td>
806 visual
807 </td>
808 </tr>
809 <tr>
810 <td>
811 <em>Computed value:</em>
812 </td>
813 <td>
814 Same as specified value.
815 </td>
816 </tr>
817 </tbody>
818 </table>
819 <dl>
820 <dt>normal</dt>
821 <dd>All iterations of the animation are played as specified.</dd>
822 <dt>reverse</dt>
823 <dd>All iterations of the animation are played in the reverse direction from the way they were specified.</dd>
824 <dt>alternate</dt>
825 <dd>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.</dd>
826 <dt>alternate-reverse</dt>
827 <dd>The animation cycle iterations that are odd counts are played in the reverse direction, and the animation cycle iterations that are even counts are played in a normal direction.</dd>
828 </dl>
829 <!-- ======================================================================================================= -->
830 <h3 id="animation-play-state-property"><span id="the-animation-play-state-property-">
831 The <code class="property">'animation-play-state'</code> Property
832 </a></h3>
834 <p>
835 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.
836 </p>
837 <table class="propdef">
838 <tbody>
839 <tr>
840 <td>
841 <em>Name:</em>
842 </td>
843 <td>
844 <dfn id="animation-play-state">animation-play-state</dfn>
845 </td>
846 </tr>
847 <tr>
848 <td>
849 <em>Value:</em>
850 </td>
851 <td>
852 [ running | paused ] [, [ running | paused ] ]*
853 </td>
854 </tr>
855 <tr>
856 <td>
857 <em>Initial:</em>
858 </td>
859 <td>
860 running
861 </td>
862 </tr>
863 <tr>
864 <td>
865 <em>Applies to:</em>
866 </td>
867 <td>
868 all elements, :before and :after pseudo elements
869 </td>
870 </tr>
871 <tr>
872 <td>
873 <em>Inherited:</em>
874 </td>
875 <td>
876 no
877 </td>
878 </tr>
879 <tr>
880 <td>
881 <em>Percentages:</em>
882 </td>
883 <td>
884 N/A
885 </td>
886 </tr>
887 <tr>
888 <td>
889 <em>Media:</em>
890 </td>
891 <td>
892 visual
893 </td>
894 </tr>
895 <tr>
896 <td>
897 <em>Computed value:</em>
898 </td>
899 <td>
900 Same as specified value.
901 </td>
902 </tr>
903 </tbody>
904 </table><!-- ======================================================================================================= -->
905 <h3 id="animation-delay-property"><a id="the-animation-delay-property-">
906 The <code class="property">'animation-delay'</code> Property
907 </a></h3>
908 <p>
909 The <code class="property">'animation-delay'</code> property defines
910 when the animation will start. It allows an animation to begin
911 execution some time after it is applied. An <code
912 class="property">'animation-delay'</code> value of '0s' means the
913 animation will execute as soon as it is applied. Otherwise, the value
914 specifies an offset from the moment the animation is applied, and the
915 animation will delay execution by that offset.
916 </p>
917 <p>
918 If the value for <code class="property">'animation-delay'</code> is a
919 negative time offset then the animation will execute the moment it is
920 applied, but will appear to have begun execution at the specified
921 offset. That is, the animation will appear to begin part-way through
922 its play cycle. In the case where an animation has implied starting
923 values and a negative <code class="property">'animation-delay'</code>,
924 the starting values are taken from the moment the animation is applied.
925 </p>
926 <table class="propdef">
927 <tbody>
928 <tr>
929 <td>
930 <em>Name:</em>
931 </td>
932 <td>
933 <dfn id="animation-delay">animation-delay</dfn>
934 </td>
935 </tr>
936 <tr>
937 <td>
938 <em>Value:</em>
939 </td>
940 <td>
941 <time> [, <time>]*
942 </td>
943 </tr>
944 <tr>
945 <td>
946 <em>Initial:</em>
947 </td>
948 <td>
949 0s
950 </td>
951 </tr>
952 <tr>
953 <td>
954 <em>Applies to:</em>
955 </td>
956 <td>
957 all elements, :before and :after pseudo elements
958 </td>
959 </tr>
960 <tr>
961 <td>
962 <em>Inherited:</em>
963 </td>
964 <td>
965 no
966 </td>
967 </tr>
968 <tr>
969 <td>
970 <em>Percentages:</em>
971 </td>
972 <td>
973 N/A
974 </td>
975 </tr>
976 <tr>
977 <td>
978 <em>Media:</em>
979 </td>
980 <td>
981 visual
982 </td>
983 </tr>
984 <tr>
985 <td>
986 <em>Computed value:</em>
987 </td>
988 <td>
989 Same as specified value.
990 </td>
991 </tr>
992 </tbody>
993 </table><!-- ======================================================================================================= -->
994 <h3 id="animation-fill-mode-property"><a id="the-animation-fill-mode-property-">
995 The <code class="property">'animation-fill-mode'</code> Property
996 </a></h3>
997 <p>
998 The <code class="property">'animation-fill-mode'</code> property defines
999 what values are applied by the animation outside the time it is executing.
1000 By default, an animation will not affect property values between the
1001 time it is applied (the <code class="property">'animation-name'</code> property is
1002 set on an element) and the time it begins execution (which is determined by
1003 the <code class="property">'animation-delay'</code> property). Also, by
1004 default an animation does not affect property values after the animation
1005 ends (determined by the <code class="property">'animation-duration'</code> property).
1006 The value of <code class="property">'animation-fill-mode'</code> can
1007 override this behavior.
1008 </p>
1009 <p>
1010 If the value for <code class="property">'animation-fill-mode'</code> is
1011 <code class="css">'backwards'</code>, then the animation will
1012 apply the property values defined in its 0% or 'from' keyframe as soon
1013 as the animation is applied, during the period defined by
1014 <code class="property">'animation-delay'</code>.
1015 </p>
1016 <p>
1017 If the value for <code class="property">'animation-fill-mode'</code>
1018 is <code class="css">'forwards'</code>, then the animation will
1019 apply the property values defined in its last executing keyframe after
1020 the final iteration of the animation, until the animation style is
1021 removed. The last executing keyframe is the 'to' or '100%' keyframe,
1022 unless the animation has <code
1023 class="property">'animation-direction'</code> set to <code
1024 class="css">'alternate'</code> and both a finite and even
1025 iteration count, in which case it is the 'from' or '0%' keyframe.
1026 </p>
1027 <p>
1028 If the value for <code class="property">'animation-fill-mode'</code>
1029 is <code class="css">'both'</code>, then the animation will
1030 follow the rules for both 'forwards' and 'backwards'. That is, it will
1031 extend the animation properties in both directions.
1032 </p>
1033 <table class="propdef">
1034 <tbody>
1035 <tr>
1036 <td>
1037 <em>Name:</em>
1038 </td>
1039 <td>
1040 <dfn id="animation-fill-mode">animation-fill-mode</dfn>
1041 </td>
1042 </tr>
1043 <tr>
1044 <td>
1045 <em>Value:</em>
1046 </td>
1047 <td>
1048 [ none | forwards | backwards | both ] [, [ none | forwards | backwards | both ] ]*
1049 </td>
1050 </tr>
1051 <tr>
1052 <td>
1053 <em>Initial:</em>
1054 </td>
1055 <td>
1056 none
1057 </td>
1058 </tr>
1059 <tr>
1060 <td>
1061 <em>Applies to:</em>
1062 </td>
1063 <td>
1064 all elements, :before and :after pseudo elements
1065 </td>
1066 </tr>
1067 <tr>
1068 <td>
1069 <em>Inherited:</em>
1070 </td>
1071 <td>
1072 no
1073 </td>
1074 </tr>
1075 <tr>
1076 <td>
1077 <em>Percentages:</em>
1078 </td>
1079 <td>
1080 N/A
1081 </td>
1082 </tr>
1083 <tr>
1084 <td>
1085 <em>Media:</em>
1086 </td>
1087 <td>
1088 visual
1089 </td>
1090 </tr>
1091 <tr>
1092 <td>
1093 <em>Computed value:</em>
1094 </td>
1095 <td>
1096 Same as specified value.
1097 </td>
1098 </tr>
1099 </tbody>
1100 </table><!-- ======================================================================================================= -->
1101 <h3 id="animation-shorthand-property"><a id="the-animation-shorthand-property-">
1102 The <code class="property">'animation'</code> Shorthand Property
1103 </a></h3>
1104 <p>
1105 The <code class="property">'animation'</code> shorthand property
1106 combines seven of the animation properties into a single property.
1107 </p>
1108 <p>
1109 Note that order is important in this property. The first value that can be
1110 parsed as a time is assigned to the animation-duration. The second value that
1111 can be parsed as a time is assigned to animation-delay.
1112 </p>
1113 <p class="issue">
1114 An alternative proposal is to accept the font shorthand approach of
1115 using a "/" character between the values of the same type. e.g. 2s/4s would
1116 mean a duration of 2 seconds and a delay of 4 seconds.
1117 </p>
1118 <table class="propdef">
1119 <tbody>
1120 <tr>
1121 <td>
1122 <em>Name:</em>
1123 </td>
1124 <td>
1125 <dfn id="animation">animation</dfn>
1126 </td>
1127 </tr>
1128 <tr>
1129 <td>
1130 <em>Value:</em>
1131 </td>
1132 <td>
1133 [<'animation-name'> ||
1134 <'animation-duration'> ||
1135 <'animation-timing-function'> ||
1136 <'animation-delay'> ||
1137 <'animation-iteration-count'> ||
1138 <'animation-direction'> ||
1139 <'animation-fill-mode'>]
1140 [, [<'animation-name'> ||
1141 <'animation-duration'> ||
1142 <'animation-timing-function'> ||
1143 <'animation-delay'> ||
1144 <'animation-iteration-count'> ||
1145 <'animation-direction'> ||
1146 <'animation-fill-mode'>] ]*
1147 </td>
1148 </tr>
1149 <tr>
1150 <td>
1151 <em>Initial:</em>
1152 </td>
1153 <td>
1154 see individual properties
1155 </td>
1156 </tr>
1157 <tr>
1158 <td>
1159 <em>Applies to:</em>
1160 </td>
1161 <td>
1162 all elements, :before and :after pseudo elements
1163 </td>
1164 </tr>
1165 <tr>
1166 <td>
1167 <em>Inherited:</em>
1168 </td>
1169 <td>
1170 no
1171 </td>
1172 </tr>
1173 <tr>
1174 <td>
1175 <em>Percentages:</em>
1176 </td>
1177 <td>
1178 N/A
1179 </td>
1180 </tr>
1181 <tr>
1182 <td>
1183 <em>Media:</em>
1184 </td>
1185 <td>
1186 visual
1187 </td>
1188 </tr>
1189 <tr>
1190 <td>
1191 <em>Computed value:</em>
1192 </td>
1193 <td>
1194 Same as specified value.
1195 </td>
1196 </tr>
1197 </tbody>
1198 </table><!-- ======================================================================================================= -->
1199 <h2 id="animation-events"><a id="animation-events-">
1200 Animation Events
1201 </a></h2>
1202 <p>
1203 Several animation related events are available through the <a
1204 href="http://www.w3.org/TR/DOM-Level-2-Events/events.html">DOM Event
1205 system</a>. The start and end of an animation, and the end of each
1206 iteration of an animation all generate DOM events. An element can have
1207 multiple properties being animated simultaneously. This can occur either
1208 with a single <code class="property">animation-name</code> value with
1209 keyframes containing multiple properties, or with multiple <code
1210 class="property">animation-name</code> values. For the purposes of
1211 events, each <code class="property">animation-name</code> specifies a
1212 single animation. Therefore an event will be generated for each <code
1213 class="property">animation-name</code> value and not necessarily for
1214 each property being animated.
1215 </p>
1216 <p>
1217 The time the animation has been running is sent with each event
1218 generated. This allows the event handler to determine the current
1219 iteration of a looping animation or the current position of an
1220 alternating animation. This time does not include any time the animation
1221 was in the <code>paused</code> play state.
1222 </p>
1223 <dl>
1224 <dt>
1225 <b>Interface <i><a id="Events-AnimationEvent" name='Events-AnimationEvent'>AnimationEvent</a></i></b>
1226 </dt>
1227 <dd>
1228 <p>
1229 The <code>AnimationEvent</code> interface provides specific contextual information associated with Animation events.
1230 </p>
1231 <dl>
1232 <dt>
1233 <br>
1234 <b>IDL Definition</b>
1235 </dt>
1236 <dd>
1237 <div class='idl-code'>
1238 <pre>
1239 interface AnimationEvent : Event {
1240 readonly attribute DOMString animationName;
1241 readonly attribute float elapsedTime;
1242 void initAnimationEvent(in DOMString typeArg,
1243 in boolean canBubbleArg,
1244 in boolean cancelableArg,
1245 in DOMString animationNameArg,
1246 in float elapsedTimeArg);
1247 };
1248 </pre>
1249 </div>
1250 </dd>
1251 <dt>
1252 <b>Attributes</b>
1253 </dt>
1254 <dd>
1255 <dl>
1256 <dt>
1257 <code class='attribute-name'><a id="Events-AnimationEvent-animationName" name='Events-AnimationEvent-animationName'>animationName</a></code> of type <code>DOMString</code>, readonly
1258 </dt>
1259 <dd>
1260 The value of the <code class="property">animation-name</code> property of the
1261 animation that fired the event.
1262 </dd>
1263 </dl>
1264 <dl>
1265 <dt>
1266 <code class='attribute-name'><a id="Events-AnimationEvent-elapsedTime" name='Events-AnimationEvent-elapsedTime'>elapsedTime</a></code> of type <code>float</code>, readonly
1267 </dt>
1268 <dd>
1269 The amount of time the animation has been running, in
1270 seconds, when this event fired, excluding any time the
1271 animation was paused. For an "animationstart" event, the
1272 elapsedTime is zero unless there was a negative value for
1273 <code class="property">animation-delay</code>, in which
1274 case the event will be fired with an elapsedTime of (-1 *
1275 delay).
1276 </dd>
1277 </dl>
1278 </dd>
1279 <dt>
1280 <b>Methods</b>
1281 </dt>
1282 <dd>
1283 <dl>
1284 <dt>
1285 <code class='method-name'><a id="Events-AnimationEvent-initAnimationEvent" name='Events-AnimtionEvent-initAnimationEvent'>initAnimationEvent</a></code>
1286 </dt>
1287 <dd>
1288 <div class='method'>
1289 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.
1290 <div class='parameters'>
1291 <b>Parameters</b>
1292 <div class='paramtable'>
1293 <dl>
1294 <dt>
1295 <code class='parameter-name'>typeArg</code> of type <code>DOMString</code>
1296 </dt>
1297 <dd>
1298 Specifies the event type.<br>
1299 </dd>
1300 <dt>
1301 <code class='parameter-name'>canBubbleArg</code> of type <code>boolean</code>
1302 </dt>
1303 <dd>
1304 Specifies whether or not the event can bubble.<br>
1305 </dd>
1306 <dt>
1307 <code class='parameter-name'>cancelableArg</code> of type <code>boolean</code>
1308 </dt>
1309 <dd>
1310 Specifies whether or not the event's default action can be prevented.
1311 </dd>
1312 <dt>
1313 <code class='parameter-name'>animationNameArg</code> of type <code>DOMString</code>
1314 </dt>
1315 <dd>
1316 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>
1317 </dd>
1318 <dt>
1319 <code class='parameter-name'>elapsedTimeArg</code> of type <code>float</code>
1320 </dt>
1321 <dd>
1322 Specifies the amount of time, in seconds, the animation has been running at the time of initialization.
1323 </dd>
1324 </dl>
1325 </div>
1326 </div><!-- parameters -->
1327 <div>
1328 <b>No Return Value</b>
1329 </div>
1330 <div>
1331 <b>No Exceptions</b>
1332 </div>
1333 </div><!-- method -->
1334 </dd>
1335 </dl>
1336 </dd>
1337 </dl>
1338 </dd>
1339 </dl>
1340 <p>
1341 The different types of Animation events that can occur are:
1342 </p>
1343 <dl>
1344 <dt>
1345 <b>animationstart</b>
1346 </dt>
1347 <dd>
1348 The 'animationstart' event occurs at the start of the animation. If there is an
1349 <code class="property">animation-delay</code> then this event will fire once the delay period
1350 has expired. A negative delay will cause the event to fire with an elapsedTime equal to
1351 the absolute value of the delay.
1352 <ul>
1353 <li>Bubbles: Yes
1354 </li>
1355 <li>Cancelable: No
1356 </li>
1357 <li>Context Info: animationName
1358 </li>
1359 </ul>
1360 </dd>
1361 <dt>
1362 <b>animationend</b>
1363 </dt>
1364 <dd>
1365 The 'animationend' event occurs when the animation finishes.
1366 <ul>
1367 <li>Bubbles: Yes
1368 </li>
1369 <li>Cancelable: No
1370 </li>
1371 <li>Context Info: animationName, elapsedTime
1372 </li>
1373 </ul>
1374 </dd>
1375 <dt>
1376 <b>animationiteration</b>
1377 </dt>
1378 <dd>
1379 The 'animationiteration' event occurs at the end of each iteration of an animation, except when an 'animationend' event would fire at the same time.
1380 This means that this event does not occur for animations with an iteration count of one or less.
1381 <ul>
1382 <li>Bubbles: Yes
1383 </li>
1384 <li>Cancelable: No
1385 </li>
1386 <li>Context Info: animationName, elapsedTime
1387 </li>
1388 </ul>
1389 </dd>
1390 </dl>
1391 <!-- ======================================================================================================= -->
1392 <h2 id="dom-interfaces"><a id="dom-interfaces-">
1393 DOM Interfaces
1394 </a></h2>
1395 <p>
1396 CSS animation is exposed to the CSSOM through a pair of new interfaces
1397 describing the keyframes.
1398 </p>
1399 <dl>
1400 <dt>
1401 <b>Interface <i><a id="DOM-CSSRule" name='DOM-CSSRule'>CSSRule</a></i></b>
1402 </dt>
1403 <dd>
1404 <p>
1405 The following 2 rule types are added to the <code>CSSRule</code> interface. They provide identification for the new keyframe and keyframes rules.
1406 </p>
1407 <dl>
1409 <dt>
1410 <b>IDL Definition</b>
1411 </dt>
1412 <dd>
1413 <div class='idl-code'>
1414 <pre>
1415 interface CSSRule {
1416 ...
1417 const unsigned short KEYFRAMES_RULE = 7;
1418 const unsigned short KEYFRAME_RULE = 8;
1419 ...
1420 };</pre>
1421 </div>
1422 </dd> <!-- IDL -->
1423 </dl>
1424 </dd>
1426 <dt>
1427 <b>Interface <i><a id="DOM-CSSKeyframeRule" name='DOM-CSSKeyframeRule'>CSSKeyframeRule</a></i></b>
1428 </dt>
1429 <dd>
1430 <p>
1431 The <code>CSSKeyframeRule</code> interface represents the style rule for a single key.
1432 </p>
1433 <dl>
1434 <dt>
1435 <br>
1436 <b>IDL Definition</b>
1437 </dt>
1438 <dd>
1439 <div class='idl-code'>
1440 <pre>
1441 interface CSSKeyframeRule : CSSRule {
1442 attribute DOMString keyText;
1443 readonly attribute CSSStyleDeclaration style;
1444 };
1445 </pre>
1446 </div><br>
1447 </dd>
1448 <dt>
1449 <b>Attributes</b>
1450 </dt>
1451 <dd>
1452 <dl>
1453 <dt>
1454 <code class='attribute-name'><a id="DOM-CSSKeyframeRule-keyText" name='DOM-CSSKeyframeRule-keyText'>keyText</a></code> of type <code>DOMString</code>
1455 </dt>
1456 <dd>
1457 This attribute represents the key as the string representation of a floating point number between 0 and 1. If the value
1458 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
1459 value will be 1.<br>
1460 </dd>
1461 </dl>
1462 </dd>
1463 <dd>
1464 <dl>
1465 <dt>
1466 <code class='attribute-name'><a id="DOM-CSSKeyframeRule-style" name='DOM-CSSKeyframeRule-style'>style</a></code> of type <code>CSSStyleDeclaration</code>
1467 </dt>
1468 <dd>
1469 This attribute represents the style associated with this keyframe.<br>
1470 </dd>
1471 </dl>
1472 </dd>
1473 <dt>
1474 <b>No Methods</b>
1475 </dt>
1476 </dl>
1477 </dd>
1478 </dl>
1479 <dl>
1480 <dt>
1481 <b>Interface <i><a id="DOM-CSSKeyframesRule" name='DOM-CSSKeyframesRule'>CSSKeyframesRule</a></i></b>
1482 </dt>
1483 <dd>
1484 <p>
1485 The <code>CSSKeyframesRule</code> interface represents a complete set of keyframes for a single animation.
1486 </p>
1487 <dl>
1488 <dt>
1489 <br>
1490 <b>IDL Definition</b>
1491 </dt>
1492 <dd>
1493 <div class='idl-code'>
1494 <pre>
1495 interface CSSKeyframesRule : CSSRule {
1496 attribute DOMString name;
1497 readonly attribute CSSRuleList cssRules;
1499 void appendRule(in DOMString rule);
1500 void deleteRule(in DOMString key);
1501 CSSKeyframeRule findRule(in DOMString key);
1502 };
1503 </pre>
1504 </div><br>
1505 </dd>
1506 <dt>
1507 <b>Attributes</b>
1508 </dt>
1509 <dd>
1510 <dl>
1511 <dt>
1512 <code class='attribute-name'><a id="DOM-CSSKeyframesRule-name" name='DOM-CSSKeyframesRule-name'>name</a></code> of type <code>DOMString</code>
1513 </dt>
1514 <dd>
1515 This attribute is the name of the keyframes, used by the <code>animation-name</code> property.<br>
1516 </dd>
1517 </dl>
1518 </dd>
1519 <dd>
1520 <dl>
1521 <dt>
1522 <code class='attribute-name'><a id="DOM-CSSKeyframeRules-cssRules" name='DOM-CSSKeyframeRules-cssRules'>cssRules</a></code> of type <code>CSSRuleList</code>
1523 </dt>
1524 <dd>
1525 This attribute gives access to the keyframes in the list.<br>
1526 </dd>
1527 </dl>
1528 </dd>
1529 <dt>
1530 <b>Methods</b>
1531 </dt>
1532 <dd>
1533 <dl>
1534 <!-- ======================================================================================================= -->
1535 <dt>
1536 <code class='method-name'><a id="DOM-CSSKeyframesRule-appendRule" name='DOM-CSSKeyframesRule-appendRule'>appendRule</a></code>
1537 </dt>
1538 <dd>
1539 <div class='method'>
1540 The <code>appendRule</code> method appends the passed CSSKeyframeRule into the list at the passed key.
1541 <div class='parameters'>
1542 <b>Parameters</b>
1543 <div class='paramtable'>
1544 <dl>
1545 <dt>
1546 <code class='parameter-name'>rule</code> of type <code>DOMString</code>
1547 </dt>
1548 <dd>
1549 The rule to be appended, expressed in the same syntax as one entry in the
1550 <code>@keyframes</code> rule.
1551 </dd>
1552 </dl>
1553 </div>
1554 </div><!-- parameters -->
1555 <div class='return-value'>
1556 <b>No Return Value</b>
1557 </div>
1558 <div>
1559 <b>No Exceptions</b>
1560 </div>
1561 </div><!-- ======================================================================================================= -->
1562 </dd>
1563 <dt>
1564 <code class='method-name'><a id="DOM-CSSKeyframesRule-deleteRule" name='DOM-CSSKeyframesRule-deleteRule'>deleteRule</a></code>
1565 </dt>
1566 <dd>
1567 <div class='method'>
1568 The <code>deleteRule</code> method deletes the CSSKeyframeRule with the passed key. If a rule with this key
1569 does not exist, the method does nothing.
1570 <div class='parameters'>
1571 <b>Parameters</b>
1572 <div class='paramtable'>
1573 <dl>
1574 <dt>
1575 <code class='parameter-name'>key</code> of type <code>DOMString</code>
1576 </dt>
1577 <dd>
1578 The key which describes the rule to be deleted. The key must
1579 resolve to a number between 0 and 1, or the rule is ignored.<br>
1580 </dd>
1581 </dl>
1582 </div>
1583 </div><!-- parameters -->
1584 <div class='return-value'>
1585 <b>No Return Value</b>
1586 </div>
1587 <div>
1588 <b>No Exceptions</b>
1589 </div>
1590 </div><!-- ======================================================================================================= -->
1591 </dd>
1592 <dt>
1593 <code class='method-name'><a id="DOM-CSSKeyframesRule-findRule" name='DOM-CSSKeyframesRule-findRule'>findRule</a></code>
1594 </dt>
1595 <dd>
1596 <div class='method'>
1597 The <code>findRule</code> method returns the rule with a key matching the passed key. If no such rule
1598 exists, a null value is returned.
1599 <div class='parameters'>
1600 <b>Parameters</b>
1601 <div class='paramtable'>
1602 <dl>
1603 <dt>
1604 <code class='parameter-name'>key</code> of type <code>DOMString</code>
1605 </dt>
1606 <dd>
1607 The key which described the rule to find. The key must
1608 resolve to a number between 0 and 1, or the rule is ignored.<br>
1609 </dd>
1610 </dl>
1611 </div>
1612 </div><!-- parameters -->
1613 <div class='return-value'>
1614 <b>Return Value</b>
1615 <div class='returnvalue'>
1616 <dl>
1617 <dt>
1618 <code>CSSKeyframeRule</code>
1619 </dt>
1620 <dd>
1621 The found rule.<br>
1622 </dd>
1623 </dl>
1624 </div>
1625 </div>
1626 <div>
1627 <b>No Exceptions</b>
1628 </div>
1629 </div><!-- ======================================================================================================= -->
1630 </dd>
1631 </dl><!-- method -->
1632 </dd>
1633 </dl>
1634 </dd>
1635 </dl>
1637 <h2 id="acknowledgments">Acknowledgments</h2>
1639 <p>Thanks especially to the feedback from
1640 Tab Atkins,
1641 Estelle Weyl,
1642 and all the rest of the
1643 <a href="http://lists.w3.org/Archives/Public/www-style/">www-style</a> community.</p>
1645 <h2>References</h2>
1647 <h3 class="no-num">Normative references</h3>
1648 <!--normative-->
1650 <h3 class="no-num">Other references</h3>
1651 <!--informative-->
1655 <h2 class="no-num">Property index</h2>
1656 <!-- properties -->
1660 <h2 class="no-num" id="index">Index</h2>
1661 <!--index-->
1663 </body>
1664 </html>
1665 <!-- Keep this comment at the end of the file
1666 Local variables:
1667 mode: sgml
1668 sgml-default-doctype-name:"html"
1669 sgml-minimize-attributes:t
1670 End:
1671 -->
