css-transitions/Overview.src.html@1cb2b4e9ea3b
css-transitions/Overview.src.html
Fri, 06 Sep 2013 16:17:52 +0100
- author
- L. David Baron <dbaron@dbaron.org>
- date
- Fri, 06 Sep 2013 16:17:52 +0100
- changeset 9050
- 1cb2b4e9ea3b
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- child 9077
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[css-transitions] Add a changes section in the HTML and remove the plaintext changelog.
1 <!DOCTYPE html PUBLIC '-//W3C//DTD HTML 4.01//EN'
2 'http://www.w3.org/TR/html4/strict.dtd'>
4 <html lang="en">
5 <head>
6 <title>CSS Transitions</title>
7 <script src='http://test.csswg.org/harness/annotate.js#css-transitions-1_dev' type='text/javascript' defer></script>
8 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
9 <link rel="stylesheet" type="text/css" href="../default.css">
10 <style type="text/css">
11 table.animatable-properties {
12 border-collapse: collapse;
13 }
14 table.animatable-properties td {
15 padding: 0.2em 1em;
16 border: 1px solid black;
17 }
18 div.prod { margin: 1em 2em; }
19 </style>
20 <link rel="stylesheet" type="text/css" href="http://www.w3.org/StyleSheets/TR/W3C-[STATUS].css">
21 </head>
23 <body>
25 <div class="head">
26 <!--logo-->
28 <h1>CSS Transitions</h1>
30 <h2 class="no-num no-toc">[LONGSTATUS] [DATE]</h2>
31 <dl>
32 <dt>This version:
33 <dd>
34 <a href="[VERSION]">[VERSION]</a>
35 <dt>Latest version:
36 <dd><a href="http://www.w3.org/TR/css3-transitions/">
37 [LATEST]</a>
38 <dt>Editor's draft:
39 <dd><a href="http://dev.w3.org/csswg/[SHORTNAME]/">http://dev.w3.org/csswg/[SHORTNAME]/</a>
40 (<a href="https://dvcs.w3.org/hg/csswg/log/tip/css-transitions/Overview.src.html">change log</a>,
41 <a href="https://dvcs.w3.org/hg/csswg/log/tip/css3-transitions/Overview.src.html">older change log</a>)
42 <dt>Previous version:
43 <dd><a href="http://www.w3.org/TR/2013/WD-css3-transitions-20130212/">http://www.w3.org/TR/2013/WD-css3-transitions-20130212/</a>
44 <dt id="editors-list">Editors:
45 <dd><a href="mailto:dino@apple.com">Dean Jackson</a> (<a
46 href="http://www.apple.com/">Apple Inc</a>)
47 <dd><a href="mailto:hyatt@apple.com">David Hyatt</a> (<a
48 href="http://www.apple.com/">Apple Inc</a>)
49 <dd><a href="mailto:cmarrin@apple.com">Chris Marrin</a> (<a
50 href="http://www.apple.com/">Apple Inc</a>)
51 <dd class=vcard><a class=fn href="http://dbaron.org/">L. David Baron</a> (<a
52 class=org href="http://www.mozilla.org/">Mozilla</a>)
54 <dt>Issues list:
55 <dd><a href="https://www.w3.org/Bugs/Public/buglist.cgi?query_format=advanced&product=CSS&component=Transitions&resolution=---&cmdtype=doit">in Bugzilla</a>
57 <dt>Feedback:
58 <dd><a href="mailto:www-style@w3.org?subject=%5Bcss-transitions%5D%20feedback">www-style@w3.org</a>
59 with subject line “<kbd>[css-transitions] <var>… message topic …</var></kbd>”
60 (<a rel="discussion" href="http://lists.w3.org/Archives/Public/www-style/">archives</a>)
62 <dt>Test suite:
63 <dd> <a href="http://test.csswg.org/suites/css-transitions-1/nightly-unstable/">http://test.csswg.org/suites/css-transitions-1/nightly-unstable/</a>
64 </dl>
66 <!--copyright-->
68 <hr title="Separator for header">
69 </div>
71 <h2 class="no-num no-toc" id="abstract">Abstract</h2>
73 <p>CSS Transitions allows property changes in CSS values to occur smoothly
74 over a specified duration.
76 <h2 class="no-num no-toc" id="status">Status of this document</h2>
77 <!--status-->
79 <h2 class="no-num no-toc" id="contents">Table of Contents</h2>
80 <!--toc-->
83 <h2 id="introduction">Introduction</h2>
85 <p><em>This section is not normative.</em>
86 <p>
87 This document introduces new CSS features to enable <em>implicit transitions</em>, which describe how CSS properties can be made to change smoothly from one value to another over a given duration.
88 </p>
90 <h2 id="transitions"><a id="transitions-">Transitions</a></h2>
91 <p>
92 Normally when the value of a CSS property changes, the rendered result is instantly updated, with the affected elements immediately changing from the old property value to the new property value. This section describes a way to specify transitions using new CSS properties. These properties are used to animate smoothly from the old state to the new state over time.
93 </p>
94 <p>
95 For example, suppose that transitions of one second have been defined on the 'left' and
96 'background-color' properties. The following diagram illustrates the effect of updating those properties on an element, in this case moving it to the right and changing the background from red to blue. This assumes other transition parameters still have their default values.
97 </p>
98 <div class="figure">
99 <img src="transition1.png" alt="">
100 </div>
101 <p class="caption">
102 Transitions of 'left' and 'background-color'
103 </p>
104 <p>
105 Transitions are a presentational effect. The computed value of a property transitions over time from the old value to the new value. Therefore if a script queries the computed style of a property as it is transitioning, it will see an intermediate value that represents the current animated value of the property.
106 </p>
107 <p>
108 Only animatable CSS properties can be transitioned. See the table at the end of this document for a list
109 of properties that are animatable.
110 </p>
111 <p>
112 The transition for a property is defined using a number of new properties. For example:
113 </p>
114 <div class="example">
115 <p style="display:none">
116 Example(s):
117 </p>
118 <pre>
119 div {
120 transition-property: opacity;
121 transition-duration: 2s;
122 }
123 </pre>The above example defines a transition on the 'opacity' property that, when a new value is assigned to it, will cause a smooth change between the old value and the new value over a period of two seconds.
124 </div>
125 <p>
126 Each of the transition properties accepts a comma-separated list, allowing multiple transitions to be defined, each acting on a different property. In this case, the individual transitions take their parameters from the same index in all the lists. For example:
127 </p>
128 <div class="example">
129 <p style="display:none">
130 Example(s):
131 </p>
132 <pre>
133 div {
134 transition-property: opacity, left;
135 transition-duration: 2s, 4s;
136 }
138 </pre>This will cause the 'opacity' property to transition over a period of two seconds and the left property to transition over a period of four seconds.
139 </div>
141 <p id="list-matching">
142 In the case where the lists of values in transition properties
143 do not have the same length, the length of the
144 'transition-property' list determines the number of items in
145 each list examined when starting transitions. The lists are
146 matched up from the first value: excess values at the end are
147 not used. If one of the other properties doesn't have enough
148 comma-separated values to match the number of values of
149 'transition-property', the UA must calculate its used value by
150 repeating the list of values until there are enough. This
151 truncation or repetition does not affect the computed value.
152 <span class="note">
153 Note: This is analogous to the behavior of the 'background-*'
154 properties, with 'background-image' analogous to
155 'transition-property'.
156 </span>
157 </p>
159 <div class="example">
160 <p style="display:none">
161 Example(s):
162 </p>
163 <pre>
164 div {
165 transition-property: opacity, left, top, width;
166 transition-duration: 2s, 1s;
167 }
168 </pre>The above example defines a transition on the 'opacity' property of 2 seconds duration, a
169 transition on the 'left' property of 1
170 second duration, a transition on the 'top' property of 2 seconds duration and a
171 transition on the 'width' property of 1
172 second duration.
174 </div>
176 <p>
177 While authors can use transitions to create dynamically changing content,
178 dynamically changing content can lead to seizures in some users.
179 For information on how to avoid content that can lead to seizures, see
180 <a href="http://www.w3.org/TR/WCAG20/#seizure">Guideline 2.3:
181 Seizures:
182 Do not design content in a way that is known to cause seizures</a>
183 ([[WCAG20]]).
184 </p>
186 <!-- ======================================================================================================= -->
187 <h3 id="transition-property-property"><a id="the-transition-property-property-">
188 The 'transition-property' Property
189 </a></h3>
190 <p>
191 The 'transition-property' property specifies the name of the CSS property to which the transition is applied.
192 </p>
193 <table class="propdef">
194 <tbody>
195 <tr>
196 <td>
197 <em>Name:</em>
198 </td>
199 <td>
200 <dfn id="transition-property">transition-property</dfn>
201 </td>
202 </tr>
203 <tr>
204 <td>
205 <em>Value:</em>
206 </td>
207 <td>
208 none | <span><single-transition-property></span> [ ',' <span><single-transition-property></span> ]*
209 </td>
210 </tr>
211 <tr>
212 <td>
213 <em>Initial:</em>
214 </td>
215 <td>
216 all
217 </td>
218 </tr>
219 <tr>
220 <td>
221 <em>Applies to:</em>
222 </td>
223 <td>
224 all elements, :before and :after pseudo elements
225 </td>
226 </tr>
227 <tr>
228 <td>
229 <em>Inherited:</em>
230 </td>
231 <td>
232 no
233 </td>
234 </tr>
235 <tr>
236 <td>
237 <em>Animatable:</em>
238 </td>
239 <td>
240 no
241 </td>
242 </tr>
243 <tr>
244 <td>
245 <em>Percentages:</em>
246 </td>
247 <td>
248 N/A
249 </td>
250 </tr>
251 <tr>
252 <td>
253 <em>Media:</em>
254 </td>
255 <td>
256 visual
257 </td>
258 </tr>
259 <tr>
260 <td>
261 <em>Computed value:</em>
262 </td>
263 <td>
264 Same as specified value.
265 </td>
266 </tr>
267 <tr>
268 <td>
269 <em>Canonical order:</em>
270 </td>
271 <td>
272 <abbr title="follows order of property value definition">per grammar</abbr>
273 </td>
274 </tr>
275 </tbody>
276 </table>
278 <div class="prod">
279 <dfn id="single-transition-property"><single-transition-property></dfn> = all | <IDENT>
280 </div>
282 <p>
283 A value of ''none'' means that no property will transition.
284 Otherwise, a list of properties to be transitioned, or the
285 keyword ''all'' which indicates that all properties are to be
286 transitioned, is given.
287 </p>
289 <p>
290 If one of the identifiers listed is not a recognized property
291 name or is not an animatable property, the implementation must
292 still start transitions on the animatable properties in the
293 list using the duration, delay, and timing function at their
294 respective indices in the lists for 'transition-duration',
295 'transition-delay', and 'transition-timing-function'. In other
296 words, unrecognized or non-animatable properties must be kept in
297 the list to preserve the matching of indices.
298 </p>
300 <p>
301 The keywords ''none'', ''inherit'', and ''initial'' are not
302 permitted as items within a list of more that one identifier;
303 any list that uses them is syntactically invalid.
304 In other words, the <IDENT> production in
305 <span><single-transition-property></span> matches any
306 identifier other than these three keywords.
307 </p>
309 <p>
310 For the keyword ''all'', or if one of the identifiers listed is a
311 shorthand property, implementations must start transitions for
312 any of its longhand sub-properties that are animatable (or, for
313 ''all'', all animatable properties), using the duration, delay,
314 and timing function at the index corresponding to the shorthand.
315 </p>
316 <p>
317 If a property is specified multiple times in the value of
318 'transition-property' (either on its own, via a shorthand that
319 contains it, or via the ''all'' value), then the transition that
320 starts uses the duration, delay, and timing function at the
321 index corresponding to the <em>last</em> item in the value of
322 'transition-property' that calls for animating that property.
323 </p>
324 <p class="note">
325 Note: The ''all'' value and 'all' shorthand
326 property work in similar ways, so the
327 ''all'' value is just like a shorthand that
328 covers all properties.
329 </p>
331 <!-- ======================================================================================================= -->
332 <h3 id="transition-duration-property"><a id="the-transition-duration-property-">
333 The 'transition-duration' Property
334 </a></h3>
335 <p>
336 The 'transition-duration' property defines the length of time that a transition takes.
337 </p>
338 <table class="propdef">
339 <tbody>
340 <tr>
341 <td>
342 <em>Name:</em>
343 </td>
344 <td>
345 <dfn id="transition-duration">transition-duration</dfn>
346 </td>
347 </tr>
348 <tr>
349 <td>
350 <em>Value:</em>
351 </td>
352 <td>
353 <span><time></span> [, <span><time></span>]*
354 </td>
355 </tr>
356 <tr>
357 <td>
358 <em>Initial:</em>
359 </td>
360 <td>
361 0s
362 </td>
363 </tr>
364 <tr>
365 <td>
366 <em>Applies to:</em>
367 </td>
368 <td>
369 all elements, :before and :after pseudo elements
370 </td>
371 </tr>
372 <tr>
373 <td>
374 <em>Inherited:</em>
375 </td>
376 <td>
377 no
378 </td>
379 </tr>
380 <tr>
381 <td>
382 <em>Animatable:</em>
383 </td>
384 <td>
385 no
386 </td>
387 </tr>
388 <tr>
389 <td>
390 <em>Percentages:</em>
391 </td>
392 <td>
393 N/A
394 </td>
395 </tr>
396 <tr>
397 <td>
398 <em>Media:</em>
399 </td>
400 <td>
401 interactive
402 </td>
403 </tr>
404 <tr>
405 <td>
406 <em>Computed value:</em>
407 </td>
408 <td>
409 Same as specified value.
410 </td>
411 </tr>
412 <tr>
413 <td>
414 <em>Canonical order:</em>
415 </td>
416 <td>
417 <abbr title="follows order of property value definition">per grammar</abbr>
418 </td>
419 </tr>
420 </tbody>
421 </table>
422 <p>
423 This property specifies how long the transition from the old value to the new value should take. By default the value is ''0s'', meaning that the transition is immediate (i.e. there will be no animation). A negative value for 'transition-duration' renders the declaration invalid.
424 </p>
426 <!-- =======================================================================================================
427 -->
429 <h3 id="transition-timing-function-property"><a id="transition-timing-function_tag">
430 The 'transition-timing-function' Property
431 </a></h3>
432 <p>
433 The 'transition-timing-function' property
434 describes how the intermediate values used during a transition will be
435 calculated. It allows for a transition to change speed over its
436 duration. These effects are commonly called <em>easing</em> functions.
437 In either case, a mathematical function that provides a smooth curve is
438 used.
439 </p>
440 <p>
441 Timing functions are either defined as a stepping function or
442 a <a
443 href="http://en.wikipedia.org/wiki/B%C3%A9zier_curve#Cubic_B.C3.A9zier_curves">cubic
444 Bézier curve</a>.
445 The timing function takes as its input
446 the current elapsed percentage of the transition duration
447 and outputs the percentage of the way the transition is
448 from its start value to its end value.
449 How this output is used is defined by
450 the <a href="#animatable-types">interpolation rules</a>
451 for the value type.
452 </p>
453 <p>
454 A <a href="http://en.wikipedia.org/wiki/Step_function">stepping</a>
455 function is defined by a number that divides the domain of operation
456 into equally sized intervals. Each subsequent interval is a equal step
457 closer to the goal state. The function also specifies whether the
458 change in output percentage happens at the start or end of the
459 interval (in other words, if 0% on the input percentage is the point
460 of initial change).
461 </p>
462 <div class="figure">
463 <img src="step.png" alt="The step timing function splits
464 the function domain into a number of disjoint straight line
465 segments. steps(1, start) is a function whose
466 output value is 1 for all input values. steps(1, end) is a function whose
467 output value is 0 for all input values less than 1, and output
468 is 1 for the input value of 1. steps(3, start) is a function that
469 divides the input domain into three segments, each 1/3 in length,
470 and 1/3 above the previous segment, with the first segment starting
471 at 1/3. steps(3, end) is a function that
472 divides the input domain into three segments, each 1/3 in length,
473 and 1/3 above the previous segment, with the first segment starting
474 at 0.">
475 </div>
476 <p class="caption">
477 Step timing functions
478 </p>
479 <p>
480 A <a
481 href="http://en.wikipedia.org/wiki/B%C3%A9zier_curve#Cubic_B.C3.A9zier_curves">cubic
482 Bézier curve</a> is defined by four control points, P<sub>0</sub>
483 through P<sub>3</sub> (see Figure 1). P<sub>0</sub> and P<sub>3</sub>
484 are always set to (0,0) and (1,1). The 'transition-timing-function' property is used
485 to specify the values for points P<sub>1</sub> and P<sub>2</sub>. These
486 can be set to preset values using the keywords listed below, or can be
487 set to specific values using the ''cubic-bezier'' function.
488 In the ''cubic-bezier'' function, P<sub>1</sub> and
489 P<sub>2</sub> are each specified by both an X and Y value.
490 </p>
491 <div class="figure">
492 <img src="TimingFunction.png" alt="The Bézier timing function is a
493 smooth curve from point P0 = (0,0) to point P3 = (1,1). The
494 length and orientation of the line segment P0-P1 determines
495 the tangent and the curvature of the curve at P0 and the
496 line segment P2-P3 does the same at P3.">
497 </div>
498 <p class="caption">
499 Bézier Timing Function Control Points
500 </p>
501 <table class="propdef">
502 <tbody>
503 <tr>
504 <td>
505 <em>Name:</em>
506 </td>
507 <td>
508 <dfn id="transition-timing-function">transition-timing-function</dfn>
509 </td>
510 </tr>
511 <tr>
512 <td>
513 <em>Value:</em>
514 </td>
515 <td>
516 <span><single-transition-timing-function></span> [ ',' <span><single-transition-timing-function></span> ]*
517 </td>
518 </tr>
519 <tr>
520 <td>
521 <em>Initial:</em>
522 </td>
523 <td>
524 ease
525 </td>
526 </tr>
527 <tr>
528 <td>
529 <em>Applies to:</em>
530 </td>
531 <td>
532 all elements, :before and :after pseudo elements
533 </td>
534 </tr>
535 <tr>
536 <td>
537 <em>Inherited:</em>
538 </td>
539 <td>
540 no
541 </td>
542 </tr>
543 <tr>
544 <td>
545 <em>Animatable:</em>
546 </td>
547 <td>
548 no
549 </td>
550 </tr>
551 <tr>
552 <td>
553 <em>Percentages:</em>
554 </td>
555 <td>
556 N/A
557 </td>
558 </tr>
559 <tr>
560 <td>
561 <em>Media:</em>
562 </td>
563 <td>
564 interactive
565 </td>
566 </tr>
567 <tr>
568 <td>
569 <em>Computed value:</em>
570 </td>
571 <td>
572 Same as specified value.
573 </td>
574 </tr>
575 <tr>
576 <td>
577 <em>Canonical order:</em>
578 </td>
579 <td>
580 <abbr title="follows order of property value definition">per grammar</abbr>
581 </td>
582 </tr>
583 </tbody>
584 </table>
585 <div class="prod">
586 <dfn id="single-transition-timing-function"><single-transition-timing-function></dfn> = ease | linear | ease-in | ease-out | ease-in-out | step-start | step-end | steps(<integer>[, [ start | end ] ]?) | cubic-bezier(<number>, <number>, <number>, <number>)
587 </div>
588 <p>
589 The timing functions have the following definitions.
590 </p>
591 <dl>
592 <dt>
593 ease
594 </dt>
595 <dd>
596 The ease function is equivalent to cubic-bezier(0.25, 0.1, 0.25, 1).
597 </dd>
598 <dt>
599 linear
600 </dt>
601 <dd>
602 The linear function is equivalent to cubic-bezier(0, 0, 1, 1).
603 </dd>
604 <dt>
605 ease-in
606 </dt>
607 <dd>
608 The ease-in function is equivalent to cubic-bezier(0.42, 0, 1, 1).
609 </dd>
610 <dt>
611 ease-out
612 </dt>
613 <dd>
614 The ease-out function is equivalent to cubic-bezier(0, 0, 0.58, 1).
615 </dd>
616 <dt>
617 ease-in-out
618 </dt>
619 <dd>
620 The ease-in-out function is equivalent to cubic-bezier(0.42, 0, 0.58, 1)
621 </dd>
622 <dt>
623 step-start
624 </dt>
625 <dd>
626 The step-start function is equivalent to steps(1, start).
627 </dd>
628 <dt>
629 step-end
630 </dt>
631 <dd>
632 The step-end function is equivalent to steps(1, end).
633 </dd>
634 <dt>
635 steps(<integer>[, [ start | end ] ]?)
636 </dt>
637 <dd>
638 Specifies a stepping function, described above, taking two
639 parameters. The first parameter specifies the number of intervals
640 in the function. It must be a positive integer (greater than 0).
641 The second parameter, which is optional, is
642 either the value ''start'' or ''end'', and specifies the point
643 at which the change of values occur within the interval.
644 If the second parameter is omitted, it is given the value 'end'.
645 </dd>
646 <dt>
647 cubic-bezier(<number>, <number>, <number>, <number>)
648 </dt>
649 <dd>
650 Specifies a <a
651 href="http://en.wikipedia.org/wiki/B%C3%A9zier_curve">cubic-bezier
652 curve</a>. The four values specify points P<sub>1</sub> and
653 P<sub>2</sub> of the curve as (x1, y1, x2, y2). Both x values must be
654 in the range [0, 1] or the definition is invalid. The y values can
655 exceed this range.
656 </dd>
657 </dl><!-- ======================================================================================================= -->
658 <h3 id="transition-delay-property"><a id="the-transition-delay-property-">
659 The 'transition-delay' Property
660 </a></h3>
661 <p>
662 The 'transition-delay' property defines when the transition will start. It allows a transition to begin execution some some period of time from when it is applied. A 'transition-delay' value of ''0s'' means the transition will execute as soon as the property is changed. Otherwise, the value specifies an offset from the moment the property is changed, and the transition will delay execution by that offset.
663 </p>
664 <p>
665 If the value for 'transition-delay' is a negative time offset then the transition will execute the moment the property is changed, but will appear to have begun execution at the specified offset. That is, the transition will appear to begin part-way through its play cycle. In the case where a transition has implied starting values and a negative 'transition-delay', the starting values are taken from the moment the property is changed.
666 </p>
667 <table class="propdef">
668 <tbody>
669 <tr>
670 <td>
671 <em>Name:</em>
672 </td>
673 <td>
674 <dfn id="transition-delay">transition-delay</dfn>
675 </td>
676 </tr>
677 <tr>
678 <td>
679 <em>Value:</em>
680 </td>
681 <td>
682 <span><time></span> [, <span><time></span>]*
683 </td>
684 </tr>
685 <tr>
686 <td>
687 <em>Initial:</em>
688 </td>
689 <td>
690 0s
691 </td>
692 </tr>
693 <tr>
694 <td>
695 <em>Applies to:</em>
696 </td>
697 <td>
698 all elements, :before and :after pseudo elements
699 </td>
700 </tr>
701 <tr>
702 <td>
703 <em>Inherited:</em>
704 </td>
705 <td>
706 no
707 </td>
708 </tr>
709 <tr>
710 <td>
711 <em>Animatable:</em>
712 </td>
713 <td>
714 no
715 </td>
716 </tr>
717 <tr>
718 <td>
719 <em>Percentages:</em>
720 </td>
721 <td>
722 N/A
723 </td>
724 </tr>
725 <tr>
726 <td>
727 <em>Media:</em>
728 </td>
729 <td>
730 interactive
731 </td>
732 </tr>
733 <tr>
734 <td>
735 <em>Computed value:</em>
736 </td>
737 <td>
738 Same as specified value.
739 </td>
740 </tr>
741 <tr>
742 <td>
743 <em>Canonical order:</em>
744 </td>
745 <td>
746 <abbr title="follows order of property value definition">per grammar</abbr>
747 </td>
748 </tr>
749 </tbody>
750 </table><!-- ======================================================================================================= -->
751 <h3 id="transition-shorthand-property"><a id="the-transition-shorthand-property-">
752 The 'transition' Shorthand Property
753 </a></h3>
754 <p>
755 The 'transition' shorthand property combines the four properties described above into a single property.
756 </p>
757 <table class="propdef">
758 <tbody>
759 <tr>
760 <td>
761 <em>Name:</em>
762 </td>
763 <td>
764 <dfn id="transition">transition</dfn>
765 </td>
766 </tr>
767 <tr>
768 <td>
769 <em>Value:</em>
770 </td>
771 <td>
772 <span><single-transition></span> [ ',' <span><single-transition></span> ]*
773 </td>
774 </tr>
775 <tr>
776 <td>
777 <em>Initial:</em>
778 </td>
779 <td>
780 see individual properties
781 </td>
782 </tr>
783 <tr>
784 <td>
785 <em>Applies to:</em>
786 </td>
787 <td>
788 all elements, :before and :after pseudo elements
789 </td>
790 </tr>
791 <tr>
792 <td>
793 <em>Inherited:</em>
794 </td>
795 <td>
796 no
797 </td>
798 </tr>
799 <tr>
800 <td>
801 <em>Animatable:</em>
802 </td>
803 <td>
804 no
805 </td>
806 </tr>
807 <tr>
808 <td>
809 <em>Percentages:</em>
810 </td>
811 <td>
812 N/A
813 </td>
814 </tr>
815 <tr>
816 <td>
817 <em>Media:</em>
818 </td>
819 <td>
820 interactive
821 </td>
822 </tr>
823 <tr>
824 <td>
825 <em>Computed value:</em>
826 </td>
827 <td>
828 see individual properties
829 </td>
830 </tr>
831 <tr>
832 <td>
833 <em>Canonical order:</em>
834 </td>
835 <td>
836 <abbr title="follows order of property value definition">per grammar</abbr>
837 </td>
838 </tr>
839 </tbody>
840 </table>
842 <div class="prod">
843 <dfn id="single-transition"><single-transition></dfn> = [ none | <span><single-transition-property></span> ] || <span><time></span> || <span><single-transition-timing-function></span> || <span><time></span>
844 </div>
846 <p>
847 Note that order is important within the items in this property:
848 the first value that can be parsed as a time is assigned to the
849 transition-duration,
850 and the second value that can be parsed as a time is assigned to
851 transition-delay.
852 </p>
854 <p>
855 If there is more than one <span><single-transition></span> in the shorthand,
856 and any of the transitions has
857 ''none'' as the <span><single-transition-property></span>,
858 then the declaration is invalid.
859 </p>
861 <h2 id="starting">
862 Starting of transitions
863 </h2>
865 <p>
866 When the computed value of an animatable property changes,
867 implementations must decide what transitions to start based on
868 the values of the 'transition-property', 'transition-duration',
869 'transition-timing-function', and 'transition-delay' properties
870 at the time the animatable property would first have its new
871 computed value.
872 This means that when one of these 'transition-*' properties
873 changes at the same time as
874 a property whose change might transition,
875 it is the <em>new</em> values of the 'transition-*' properties
876 that control the transition.
877 </p>
878 <div class="example" id="manual-reversing-example">
879 <p style="display:none">
880 Example(s):
881 </p>
882 <p>This provides a way for authors to specify different values
883 of the 'transition-*' properties for the “forward”
884 and “reverse” transitions (but see <a
885 href="#reversing">below</a> for special reversing behavior when
886 an <em>incomplete</em> transition is interrupted). Authors can
887 specify the value of 'transition-duration',
888 'transition-timing-function', or 'transition-delay' in the same
889 rule where they specify the value that triggers the transition,
890 or can change these properties at the same time as they change
891 the property that triggers the transition. Since it's the new
892 values of these 'transition-*' properties that affect the
893 transition, these values will be used for the transitions
894 <em>to</em> the associated transitioning values. For example:
895 </p>
896 <pre>li {
897 transition: background-color linear 1s;
898 background: blue;
899 }
900 li:hover {
901 background-color: green;
902 transition-duration: 2s; /* applies to the transition *to* the :hover state */
903 }</pre>
904 <p>
905 When a list item with these style rules enters the :hover
906 state, the computed 'transition-duration' at the time that
907 'background-color' would have its new value (''green'') is ''2s'',
908 so the transition from 'blue' to 'green' takes 2 seconds.
909 However, when the list item leaves the :hover state, the
910 transition from ''green'' to ''blue'' takes 1 second.
911 </p>
912 </div>
914 <p>
915 When the computed value of a property changes, implementations
916 must start transitions based on the relevant item (see <a
917 href="#transition-property">the definition of
918 'transition-property'</a>) in the computed value of
919 'transition-property'.
920 Corresponding to this item there are
921 computed values of 'transition-duration' and 'transition-delay'
922 (see <a href="#list-matching">the rules on matching lists</a>).
923 Define the <dfn>combined duration</dfn> of the transition
924 as the sum of max('transition-duration', ''0s'') and 'transition-delay'.
925 When the combined duration is greater than ''0s'',
926 then a transition starts based on the values of
927 'transition-duration', 'transition-delay',
928 and 'transition-timing-function';
929 in other cases transitions do not occur.
930 </p>
932 <p>
933 Since this specification does not define
934 when computed values change, and thus what changes to
935 computed values are considered simultaneous,
936 authors should be aware that changing any of the transition
937 properties a small amount of time after making a change that
938 might transition can result in behavior that varies between
939 implementations, since the changes might be considered
940 simultaneous in some implementations but not others.
941 </p>
943 <p>
944 Once the transition of a property has started, it must continue
945 running based on the original timing function, duration, and
946 delay, even if the 'transition-timing-function',
947 'transition-duration', or 'transition-delay' property changes
948 before the transition is complete. However, if the
949 'transition-property' property changes such that the transition
950 would not have started, the transition must stop (and the
951 property must immediately change to its final value).
952 </p>
954 <p>
955 Implementations must not start a transition when the computed
956 value of a property changes as a result of declarative animation
957 (as opposed to scripted animation).
958 </p>
960 <p>
961 Implementations also must not start a transition when the
962 computed value changes because it is inherited (directly or
963 indirectly) from another element that is transitioning the same
964 property.
965 </p>
967 <p class="issue">
968 Issue: These rules don't define a model clearly enough to define
969 the behavior in harder cases, such when transition properties
970 are present on both ancestor and descendant. See
971 <a href="http://lists.w3.org/Archives/Public/www-style/2013Mar/0297.html">description of issues and proposed model</a>.
972 Working Group resolution from 2013-06-06 needs to be edited.
973 </p>
975 <h2 id="reversing">
976 Automatically reversing interrupted transitions
977 </h2>
978 <p>
979 A common type of transition effect is when a running transition is
980 interrupted and the property is reset to its original value. An
981 example is a hover effect on an element, where the pointer enters and
982 exits the element before the effect has completed. If the outgoing and
983 incoming transitions are executed using their specified durations and
984 timing functions, the resulting effect can be distractingly
985 asymmetric. Instead, the expected behavior is that the new transition
986 should be the reverse of what has already executed.
987 </p>
989 <p>
990 If a running transition with duration T, executing so far for duration TE,
991 from state A, to state B, is interrupted by
992 a property change that would start a new transition back to state A, and
993 all the transition attributes are the same (duration, delay and timing function),
994 then the new transition must reverse the effect. The new transition must:
995 </p>
997 <ol>
998 <li>
999 Use the B and A states as its "from" and "to" states respectively. It
1000 does not use the current value as its from state, due to the rules below.
1001 </li>
1002 <li>
1003 Execute with the same duration T, but starting as if the transition had
1004 already begun, without any transition delay, at the moment which would
1005 cause the new transition to finish in TE from the moment of interruption. In other
1006 words, the new transition will execute as if it started T-TE in the past.
1007 </li>
1008 <li>
1009 Use a timing function that is the portion of the curve traversed up
1010 to the moment of interruption, followed in the opposite direction (towards
1011 the starting point). This will make the transition appear as if it
1012 is playing backwards.
1013 </li>
1014 <li>
1015 Ignore any transition delay.
1016 </li>
1017 </ol>
1019 <p>
1020 For example, suppose there is a transition with a duration of two
1021 seconds. If this transition is interrupted after 0.5 seconds and the
1022 property value assigned to the original value, then the new transition
1023 effect will be the reverse of the original, as if it had begun
1024 1.5 seconds in the past.
1025 </p>
1027 <p>
1028 Note that by using the defined from and to states for the reversing
1029 transition, it is also possible that it may reverse again, if
1030 interrupted; for example, if the transition reversing to state A was
1031 again interrupted by a property change to state B.
1032 </p>
1034 <p class="issue">Issue:
1035 This introduces the concept of reversing a timing function,
1036 which the spec has otherwise resisted doing, and also introduces
1037 a discontinuity between transitions that have
1038 almost completed (which get automatically reversed and thus have
1039 their timing function reversed) and transitions that have fully
1040 completed (where the reversal doesn't lead to the timing
1041 function being reversed). An alternative proposal that avoids
1042 this is to follow the normal timing function algorithm, except
1043 multiply the duration (and also shorten any negative delay) by
1044 the (output) value of the transition timing function of the
1045 incomplete transition at the time it was interrupted, and, to
1046 account for multiple reverses in sequence, to divide by the
1047 shortening applied to the transition being interrupted. For
1048 more details see this thread:
1049 <a href="http://lists.w3.org/Archives/Public/www-style/2009Nov/thread.html#msg302">November 2009 part</a>,
1050 <a href="http://lists.w3.org/Archives/Public/www-style/2009Dec/thread.html#msg319">December 2009 part</a>,
1051 <a href="http://lists.w3.org/Archives/Public/www-style/2010Jan/thread.html#msg136">January 2010 part</a>.
1052 Also see:
1053 <a href="http://lists.w3.org/Archives/Public/public-fx/2012AprJun/0107.html">minutes 2012-05-09</a> (and <a href="http://www.w3.org/Graphics/fx/track/actions/77">action</a>),
1054 <a href="http://lists.w3.org/Archives/Public/www-style/2012Nov/0262.html">minutes 2012-10-30</a>,
1055 <a href="transition-reversing-demo">reversing demo</a>.
1056 Working Group resolution from 2013-06-07 needs to be edited.
1057 </p>
1059 <h2 id="transition-events"><a id="transition-events-">
1060 Transition Events
1061 </a></h2>
1062 <p>
1063 The completion of a CSS Transition generates a corresponding <a href="http://www.w3.org/TR/DOM-Level-2-Events/events.html">DOM Event</a>.
1064 An event is fired for each property that undergoes a transition.
1065 This allows a content developer to perform actions that synchronize
1066 with the completion of a transition.
1067 </p>
1068 <p>
1069 Each event provides the name of the property the transition is
1070 associated with as well as the duration of the transition.
1071 </p>
1072 <dl>
1073 <dt>
1074 <b>Interface <dfn id="Events-TransitionEvent">TransitionEvent</dfn></b>
1075 </dt>
1076 <dd>
1077 <p>
1078 The <code>TransitionEvent</code> interface provides specific contextual information associated with transitions.
1079 </p>
1080 <dl>
1081 <dt>
1082 <b>IDL Definition</b>
1083 </dt>
1084 <dd>
1085 <div class='idl-code'>
1086 <pre>
1087 <span id="TransitionEvent">[Constructor(DOMString <var title="">type</var>, optional <i>TransitionEventInit</i> <var title="">transitionEventInitDict</var>)]
1088 interface TransitionEvent</span> : Event {
1089 readonly attribute DOMString <a href="#Events-TransitionEvent-propertyName">propertyName</a>;
1090 readonly attribute float <a href="#Events-TransitionEvent-elapsedTime">elapsedTime</a>;
1091 readonly attribute DOMString <a href="#Events-TransitionEvent-pseudoElement">pseudoElement</a>;
1092 };
1094 dictionary <dfn id="TransitionEventInit">TransitionEventInit</dfn> : <a class="external" href="http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#eventinit">EventInit</a> {
1095 DOMString <a href="#Events-TransitionEvent-propertyName">propertyName</a> = "";
1096 float <a href="#Events-TransitionEvent-elapsedTime">elapsedTime</a> = 0.0;
1097 DOMString <a href="#Events-TransitionEvent-pseudoElement">pseudoElement</a> = "";
1098 }
1099 </pre>
1100 </div>
1101 </dd>
1102 <dt>
1103 <b>Attributes</b>
1104 </dt>
1105 <dd>
1106 <dl>
1107 <dt>
1108 <code class='attribute-name'><dfn title="TransitionEvent::propertyName" id="Events-TransitionEvent-propertyName">propertyName</dfn></code> of type <code>DOMString</code>, readonly
1109 </dt>
1110 <dd>
1111 The name of the CSS property associated with the transition.
1112 </dd>
1113 </dl>
1114 <dl>
1115 <dt>
1116 <code class='attribute-name'><dfn title="TransitionEvent::elapsedTime" id="Events-TransitionEvent-elapsedTime">elapsedTime</dfn></code> of type <code>float</code>, readonly
1117 </dt>
1118 <dd>
1119 The amount of time the transition has been running, in seconds, when this event fired. Note that this value is not affected by the value of <code class="property">transition-delay</code>.
1120 </dd>
1121 </dl>
1122 <dl>
1123 <dt>
1124 <code class='attribute-name'><dfn title="TransitionEvent::pseudoElement" id="Events-TransitionEvent-pseudoElement">pseudoElement</dfn></code> of type <code>DOMString</code>, readonly
1125 </dt>
1126 <dd>
1127 The name (beginning with two colons) of the CSS
1128 pseudo-element on which the transition occured (in
1129 which case the target of the event is that
1130 pseudo-element's corresponding element), or the empty
1131 string if the transition occurred on an element (which
1132 means the target of the event is that element).
1133 </dd>
1134 </dl>
1135 </dd>
1136 </dl>
1137 <p>
1138 <code id="TransitionEvent-constructor">TransitionEvent(type, transitionEventInitDict)</code>
1139 is an <a class="external" href="http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#constructing-events">event constructor</a>.
1140 </p>
1141 </dd>
1142 </dl>
1143 <p>
1144 There is one type of transition event available.
1145 </p>
1146 <dl>
1147 <dt>
1148 <b><dfn>transitionend</dfn></b>
1149 </dt>
1150 <dd>
1151 The <code>transitionend</code> event occurs at the completion of the transition. In the
1152 case where a transition is removed before completion, such as if the
1153 transition-property is removed, then the event will not fire.
1154 <ul>
1155 <li>Bubbles: Yes
1156 </li>
1157 <li>Cancelable: Yes
1158 </li>
1159 <li>Context Info: propertyName, elapsedTime, pseudoElement
1160 </li>
1161 </ul>
1162 </dd>
1163 </dl>
1165 <h2 id="animatable-types"><a id="animation-of-property-types-">
1166 Animation of property types
1167 </a></h2>
1169 <p>
1170 When interpolating between two values,
1171 <i>V</i><sub>start</sub> and <i>V</i><sub>end</sub>,
1172 interpolation is done using the output <i>p</i> of the timing function,
1173 which gives the portion of the value space
1174 that the interpolation has crossed.
1175 Thus the result of the interpolation is
1176 <i>V</i><sub>res</sub> =
1177 (1 - <i>p</i>) ⋅ <i>V</i><sub>start</sub> +
1178 <i>p</i> ⋅ <i>V</i><sub>end</sub>.
1179 </p>
1181 <p>
1182 However, if this value (<i>V</i><sub>res</sub>)
1183 is outside the allowed range of values for the property,
1184 then it is clamped to that range.
1185 This can occur if <i>p</i> is outside of the range 0 to 1,
1186 which can occur if a timing function is specified
1187 with a <i>y1</i> or <i>y2</i> that is outside the range 0 to 1.
1188 </p>
1190 <p>
1191 The following describes how each property type undergoes transition or
1192 animation.
1193 </p>
1195 <ul>
1196 <li id="animtype-color">
1197 <strong>color</strong>: interpolated via red, green, blue and alpha
1198 components (treating each as a number, see below).
1199 The interpolation is done between premultiplied colors
1200 (that is, colors for which the red, green, and blue components
1201 specified have been multiplied by the alpha).
1202 </li>
1203 <li id="animtype-length">
1204 <strong>length</strong>: interpolated as real numbers.
1205 </li>
1206 <li id="animtype-percentage">
1207 <strong>percentage</strong>: interpolated as real numbers.
1208 </li>
1209 <li id="animtype-lpcalc">
1210 <strong>length, percentage, or calc</strong>: when both values
1211 are lengths, interpolated as lengths; when both values are
1212 percentages, interpolated as percentages; otherwise, both
1213 values are converted into a ''calc()'' function that is the
1214 sum of a length and a percentage (each possibly zero), and
1215 these ''calc()'' functions have each half interpolated as real
1216 numbers.
1217 </li>
1218 <li id="animtype-integer">
1219 <strong>integer</strong>: interpolated via discrete steps (whole
1220 numbers). The interpolation happens in real number space and is
1221 converted to an integer by rounding to the nearest integer, with
1222 values halfway between a pair of integers rounded towards
1223 positive infinity.
1224 </li>
1225 <li id="animtype-font-weight">
1226 <strong>font weight</strong>: interpolated via discrete steps
1227 (multiples of 100). The interpolation happens in real number
1228 space and is converted to an integer by rounding to the
1229 nearest multiple of 100, with values halfway between multiples
1230 of 100 rounded towards positive infinity.
1231 </li>
1232 <li id="animtype-number">
1233 <strong>number</strong>: interpolated as real (floating point)
1234 numbers.
1235 </li>
1236 <li id="animtype-rect">
1237 <strong>rectangle</strong>: interpolated via the x, y,
1238 width and height components (treating each as a number).
1239 </li>
1240 <li id="animtype-visibility">
1241 <strong>visibility</strong>: if one of the values is
1242 ''visible'', interpolated as a discrete step where values of the
1243 timing function between 0 and 1 map to ''visible'' and other
1244 values of the timing function (which occur only at the
1245 start/end of the transition or as a result of ''cubic-bezier()''
1246 functions with Y values outside of [0, 1]) map to the closer
1247 endpoint; if neither value is ''visible'' then not interpolable.
1248 </li>
1249 <li id="animtype-shadow-list">
1250 <strong>shadow list</strong>: Each shadow in the list is
1251 interpolated via the
1252 color (as <a href="#animtype-color">color</a>) component,
1253 and x, y, blur, and (when appropriate) spread
1254 (as <a href="#animtype-length">length</a>) components.
1255 For each shadow, if one input shadow is ''inset'' and the other
1256 is not, then the result for that shadow matches the inputs;
1257 otherwise the entire list is not interpolable.
1258 If the lists of shadows have different lengths,
1259 then the shorter list is padded at the end
1260 with shadows whose color is ''transparent'',
1261 all lengths are ''0'',
1262 and whose ''inset'' (or not) matches the longer list.
1263 </li>
1264 <li id="animtype-gradient">
1265 <strong>gradient</strong>: interpolated via the
1266 positions and colors of each stop. They must have the same type
1267 (radial or linear) and same number of stops in order to be animated.
1268 <span class="note">Note: [[CSS3-IMAGES]] may extend this
1269 definition.</span>
1270 </li>
1271 <li id="animtype-paintserver">
1272 <strong>paint server</strong> (SVG): interpolation is only supported
1273 between: gradient to gradient and color to color. They then
1274 work as above.
1275 </li>
1276 <li id="animtype-simple-list">
1277 <strong>simple list</strong> of other types:
1278 If the lists have the same number of items,
1279 and each pair of values can be interpolated,
1280 each item in the list is interpolated using
1281 the rules given for those types.
1282 Otherwise the values are not interpolable.
1283 </li>
1284 <li id="animtype-repeatable-list">
1285 <strong>repeatable list</strong> of other types:
1286 The result list has a length that is the least common multiple
1287 of the lengths of the input lists.
1288 Each item in the result is the interpolation of the value
1289 from each input list repeated to the length of the result list.
1290 If a pair of values cannot be interpolated, then the lists
1291 are not interpolable.
1292 <span class="note">
1293 The repeatable list concept ensures that a list that is
1294 conceptually repeated to a certain length (as
1295 'background-origin' is repeated to the length of the
1296 'background-image' list) or repeated infinitely will
1297 smoothly transition between any values, and so that the
1298 computed value will properly represent the result (and
1299 potentially be inherited correctly).
1300 </span>
1301 </li>
1302 </ul>
1304 <p>Future specifications may define additional types that can
1305 be animated.</p>
1307 <p>See the definition of 'transition-property' for how animation
1308 of shorthand properties and the ''all'' value is applied to any
1309 properties (in the shorthand) that can be animated.</p>
1311 <h2 id="animatable-properties"><a id="animatable-properties-">
1312 Animatable properties
1313 </a></h2>
1315 <!--
1316 As resolved in
1317 http://lists.w3.org/Archives/Public/www-style/2011Sep/0497.html
1318 -->
1320 <p>The definition of each CSS property defines
1321 when the values of that property can be interpolated
1322 by referring to the definitions of property types
1323 in the <a href="#animatable-types">previous section</a>.
1324 Values are animatable when
1325 both the from and the to values of the property have the type described.
1326 (When a composite type such as "length, percentage, or calc" is listed,
1327 this means that both values must fit into that composite type.)
1328 When multiple types are listed in the form "either A or B",
1329 both values must be of the same type to be interpolable.</p>
1331 <p>For properties that exist at the time this specification was
1332 developed, this specification defines whether and how they are
1333 animated. However, future CSS specifications may define
1334 additional properties, additional values for existing properties,
1335 or additional animation behavior of existing values. In order to
1336 describe new animation behaviors and to have the definition of
1337 animation behavior in a more appropriate location, future CSS
1338 specifications should include an "Animatable:" line in the summary
1339 of the property's definition (in addition to the other lines
1340 described in [[CSS21]], <a
1341 href="http://www.w3.org/TR/CSS21/about.html#property-defs">section
1342 1.4.2</a>). This line should say "no" to indicate that a property
1343 cannot be animated or should reference an animation behavior
1344 (which may be one of the behaviors in the <a
1345 href="#animation-of-property-types-">Animation of property
1346 types</a> section above, or may be a new behavior) to define how
1347 the property animates. Such definitions override those given in
1348 this specification.</p>
1350 <h3 id="animatable-css"><a id="properties-from-css-">
1351 Properties from CSS
1352 </a></h3>
1354 <p>
1355 The following definitions define the animation behavior for
1356 properties in CSS Level 2 Revision 1 ([[CSS21]]) and in Level 3 of
1357 the CSS Color Module ([[CSS3COLOR]]).
1358 </p>
1360 <table class="animatable-properties">
1361 <tr>
1362 <th>Property Name</th>
1363 <th>Type</th>
1364 </tr>
1365 <tr>
1366 <td>background-color</td><td>as <a href="#animtype-color">color</a></tr>
1367 <tr>
1368 <td>background-position</td><td>as <a href="#animtype-repeatable-list">repeatable list</a> of <a href="#animtype-simple-list">simple list</a> of <a href="#animtype-lpcalc">length, percentage, or calc</a></td>
1369 </tr>
1370 <tr>
1371 <td>border-bottom-color</td><td>as <a href="#animtype-color">color</a></td>
1372 </tr>
1373 <tr>
1374 <td>border-bottom-width</td><td>as <a href="#animtype-length">length</a></td>
1375 </tr>
1376 <tr>
1377 <td>border-left-color</td><td>as <a href="#animtype-color">color</a></td>
1378 </tr>
1379 <tr>
1380 <td>border-left-width</td><td>as <a href="#animtype-length">length</a></td>
1381 </tr>
1382 <tr>
1383 <td>border-right-color</td><td>as <a href="#animtype-color">color</a></td>
1384 </tr>
1385 <tr>
1386 <td>border-right-width</td><td>as <a href="#animtype-length">length</a></td>
1387 </tr>
1388 <tr>
1389 <td>border-spacing</td><td>as <a href="#animtype-simple-list">simple list</a> of <a href="#animtype-length">length</a></td>
1390 </tr>
1391 <tr>
1392 <td>border-top-color</td><td>as <a href="#animtype-color">color</a></td>
1393 </tr>
1394 <tr>
1395 <td>border-top-width</td><td>as <a href="#animtype-length">length</a></td>
1396 </tr>
1397 <tr>
1398 <td>bottom</td><td>as <a href="#animtype-lpcalc">length, percentage, or calc</a></td>
1399 </tr>
1400 <tr>
1401 <td>clip</td><td>as <a href="#animtype-rect">rectangle</a></td>
1402 </tr>
1403 <tr>
1404 <td>color</td><td>as <a href="#animtype-color">color</a></td>
1405 </tr>
1406 <tr>
1407 <td>font-size</td><td>as <a href="#animtype-length">length</a></td>
1408 </tr>
1409 <tr>
1410 <td>font-weight</td><td>as <a href="#animtype-font-weight">font weight</a></td>
1411 </tr>
1412 <tr>
1413 <td>height</td><td>as <a href="#animtype-lpcalc">length, percentage, or calc</a></td>
1414 </tr>
1415 <tr>
1416 <td>left</td><td>as <a href="#animtype-lpcalc">length, percentage, or calc</a></td>
1417 </tr>
1418 <tr>
1419 <td>letter-spacing</td><td>as <a href="#animtype-length">length</a></td>
1420 </tr>
1421 <tr>
1422 <td>line-height</td><td>as either <a href="#animtype-number">number</a> or <a href="#animtype-length">length</a></td>
1423 </tr>
1424 <tr>
1425 <td>margin-bottom</td><td>as <a href="#animtype-length">length</a></td>
1426 </tr>
1427 <tr>
1428 <td>margin-left</td><td>as <a href="#animtype-length">length</a></td>
1429 </tr>
1430 <tr>
1431 <td>margin-right</td><td>as <a href="#animtype-length">length</a></td>
1432 </tr>
1433 <tr>
1434 <td>margin-top</td><td>as <a href="#animtype-length">length</a></td>
1435 </tr>
1436 <tr>
1437 <td>max-height</td><td>as <a href="#animtype-lpcalc">length, percentage, or calc</a></td>
1438 </tr>
1439 <tr>
1440 <td>max-width</td><td>as <a href="#animtype-lpcalc">length, percentage, or calc</a></td>
1441 </tr>
1442 <tr>
1443 <td>min-height</td><td>as <a href="#animtype-lpcalc">length, percentage, or calc</a></td>
1444 </tr>
1445 <tr>
1446 <td>min-width</td><td>as <a href="#animtype-lpcalc">length, percentage, or calc</a></td>
1447 </tr>
1448 <tr>
1449 <td>opacity</td><td>as <a href="#animtype-number">number</a></td>
1450 </tr>
1451 <tr>
1452 <td>outline-color</td><td>as <a href="#animtype-color">color</a></td>
1453 </tr>
1454 <tr>
1455 <td>outline-width</td><td>as <a href="#animtype-length">length</a></td>
1456 </tr>
1457 <tr>
1458 <td>padding-bottom</td><td>as <a href="#animtype-length">length</a></td>
1459 </tr>
1460 <tr>
1461 <td>padding-left</td><td>as <a href="#animtype-length">length</a></td>
1462 </tr>
1463 <tr>
1464 <td>padding-right</td><td>as <a href="#animtype-length">length</a></td>
1465 </tr>
1466 <tr>
1467 <td>padding-top</td><td>as <a href="#animtype-length">length</a></td>
1468 </tr>
1469 <tr>
1470 <td>right</td><td>as <a href="#animtype-lpcalc">length, percentage, or calc</a></td>
1471 </tr>
1472 <tr>
1473 <td>text-indent</td><td>as <a href="#animtype-lpcalc">length, percentage, or calc</a></td>
1474 </tr>
1475 <tr>
1476 <td>text-shadow</td><td>as <a href="#animtype-shadow-list">shadow list</a></td>
1477 </tr>
1478 <tr>
1479 <td>top</td><td>as <a href="#animtype-lpcalc">length, percentage, or calc</a></td>
1480 </tr>
1481 <tr>
1482 <td>vertical-align</td><td>as <a href="#animtype-length">length</a></td>
1483 </tr>
1484 <tr>
1485 <td>visibility</td><td>as <a href="#animtype-visibility">visibility</a></td>
1486 </tr>
1487 <tr>
1488 <td>width</td><td>as <a href="#animtype-lpcalc">length, percentage, or calc</a></td>
1489 </tr>
1490 <tr>
1491 <td>word-spacing</td><td>as <a href="#animtype-length">length</a></td>
1492 </tr>
1493 <tr>
1494 <td>z-index</td><td>as <a href="#animtype-integer">integer</a></td>
1495 </tr>
1496 </table>
1498 <h3 id="animatable-svg"><a id="properties-from-svg-">
1499 Properties from SVG
1500 </a></h3>
1502 <p>
1503 All properties defined as animatable in the SVG specification, provided
1504 they are one of the property types listed above.
1505 </p>
1507 <!-- <table>
1508 <tr>
1509 <th>Property Name</th><th>Type</th>
1510 </tr>
1511 <tr>
1512 <td>stop-color</td><td>as <a href="#animtype-color">color</a></td>
1513 </tr>
1514 <tr>
1515 <td>stop-opacity</td><td>as <a href="#animtype-number">number</a></td>
1516 </tr>
1517 <tr>
1518 <td>fill</td><td>as <a href="#animtype-paintserver">paint server</a></td>
1519 </tr>
1520 <tr>
1521 <td>fill-opacity</td><td>as <a href="#animtype-number">number</a></td>
1522 </tr>
1523 <tr>
1524 <td>stroke</td><td>as <a href="#animtype-paintserver">paint server</a></td>
1525 </tr>
1526 <tr>
1527 <td>stroke-dasharray</td><td>as <a href="#animtype-repeatable-list">repeatable list</a> of <a href="#animtype-number">number</a></td>
1528 </tr>
1529 <tr>
1530 <td>stroke-dashoffset</td><td>as <a href="#animtype-number">number</a></td>
1531 </tr>
1532 <tr>
1533 <td>stroke-miterlimit</td><td>as <a href="#animtype-number">number</a></td>
1534 </tr>
1535 <tr>
1536 <td>stroke-opacity</td><td>as <a href="#animtype-number">number</a></td>
1537 </tr>
1538 <tr>
1539 <td>stroke-width</td><td>as <a href="#animtype-number">number</a></td>
1540 </tr>
1541 <tr>
1542 <td>viewport-fill</td><td>as <a href="#animtype-color">color</a></td>
1543 </tr>
1544 <tr>
1545 <td>viewport-fill-opacity</td><td>as <a href="#animtype-color">color</a></td>
1546 </tr>
1547 </table> -->
1549 <h2 id="changes">Changes since Working Draft of 12 February 2013</h2>
1551 <p>The following are the substantive changes made since the
1552 <a href="http://www.w3.org/TR/2013/WD-css3-transitions-20130212/">Working Draft
1553 dated 12 February 2013</a>:</p>
1555 <ul>
1556 <li>Fixed missed substitution (<span>TransitionEventInit</span> rather than AnimationEventInit) when copying event IDL from css3-animations.
1557 <li>Make naming of event constructor dictionary parameters more consistent with DOM-Level-3-Events.
1558 <li>Make the behavior of simultaneous changes of 'transition-*' properties and transitionable properties even clearer.
1559 <li>Computed Value line for shorthands should say "see individual properties".
1560 <li>Define initial values of event properties, using initializers in <span>TransitionEventInit</span>.
1561 </ul>
1563 <p>For more details on these changes, see the version control change logs, which are split in two parts because of a file renaming: <a href="https://dvcs.w3.org/hg/csswg/log/tip/css-transitions/Overview.src.html">change log since 2013 March 28</a>, <a href="https://dvcs.w3.org/hg/csswg/log/tip/css3-transitions/Overview.src.html">change log before 2013 March 28</a>.
1565 <p>For changes in previous working drafts, see
1566 <a href="http://www.w3.org/TR/2013/WD-css3-transitions-20130212/ChangeLog">the ChangeLog</a>, and the above version control logs.</p>
1568 <h2 id="acknowledgments">Acknowledgments</h2>
1570 <p>Thanks especially to the feedback from
1571 Tab Atkins,
1572 Carine Bournez,
1573 Aryeh Gregor,
1574 Vincent Hardy,
1575 Anne van Kesteren,
1576 Cameron McCormack,
1577 Alex Mogilevsky,
1578 and all the rest of the
1579 <a href="http://lists.w3.org/Archives/Public/www-style/">www-style</a> community.</p>
1581 <h2 id="references">References</h2>
1583 <h3 class="no-num" id="normative-references">Normative references</h3>
1584 <!--normative-->
1586 <h3 class="no-num" id="other-references">Other references</h3>
1587 <!--informative-->
1591 <h2 class="no-num" id="property-index">Property index</h2>
1592 <!-- properties -->
1596 <h2 class="no-num" id="index">Index</h2>
1597 <!--index-->
1599 </body>
1600 </html>
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1602 Local variables:
1603 mode: sgml
1604 sgml-default-doctype-name:"html"
1605 sgml-minimize-attributes:t
1606 End:
1607 -->
