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
parent 9048
7730c3fca2a1
child 9077
3379bf6d2b39
permissions
-rw-r--r--

[css-transitions] Add a changes section in the HTML and remove the plaintext changelog.

dino@936 1 <!DOCTYPE html PUBLIC '-//W3C//DTD HTML 4.01//EN'
dino@936 2 'http://www.w3.org/TR/html4/strict.dtd'>
dino@936 3
dino@936 4 <html lang="en">
dino@936 5 <head>
simon@2533 6 <title>CSS Transitions</title>
rhauck@9048 7 <script src='http://test.csswg.org/harness/annotate.js#css-transitions-1_dev' type='text/javascript' defer></script>
dbaron@5319 8 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
fantasai@4174 9 <link rel="stylesheet" type="text/css" href="../default.css">
dino@936 10 <style type="text/css">
simon@4394 11 table.animatable-properties {
dino@936 12 border-collapse: collapse;
dino@936 13 }
simon@4394 14 table.animatable-properties td {
dino@936 15 padding: 0.2em 1em;
dino@936 16 border: 1px solid black;
dino@936 17 }
dbaron@6736 18 div.prod { margin: 1em 2em; }
dino@936 19 </style>
dbaron@7471 20 <link rel="stylesheet" type="text/css" href="http://www.w3.org/StyleSheets/TR/W3C-[STATUS].css">
dino@936 21 </head>
dino@936 22
dino@936 23 <body>
dino@936 24
dino@936 25 <div class="head">
dino@936 26 <!--logo-->
dino@936 27
simon@2533 28 <h1>CSS Transitions</h1>
dino@936 29
dino@936 30 <h2 class="no-num no-toc">[LONGSTATUS] [DATE]</h2>
dino@936 31 <dl>
dino@936 32 <dt>This version:
dino@936 33 <dd>
dbaron@7471 34 <a href="[VERSION]">[VERSION]</a>
dino@936 35 <dt>Latest version:
dbaron@5320 36 <dd><a href="http://www.w3.org/TR/css3-transitions/">
bert@1102 37 [LATEST]</a>
dbaron@4580 38 <dt>Editor's draft:
dbaron@4580 39 <dd><a href="http://dev.w3.org/csswg/[SHORTNAME]/">http://dev.w3.org/csswg/[SHORTNAME]/</a>
dbaron@7863 40 (<a href="https://dvcs.w3.org/hg/csswg/log/tip/css-transitions/Overview.src.html">change log</a>,
dbaron@7863 41 <a href="https://dvcs.w3.org/hg/csswg/log/tip/css3-transitions/Overview.src.html">older change log</a>)
bert@1102 42 <dt>Previous version:
dbaron@7431 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>
dino@936 44 <dt id="editors-list">Editors:
dino@936 45 <dd><a href="mailto:dino@apple.com">Dean Jackson</a> (<a
dino@936 46 href="http://www.apple.com/">Apple Inc</a>)
dino@936 47 <dd><a href="mailto:hyatt@apple.com">David Hyatt</a> (<a
dino@936 48 href="http://www.apple.com/">Apple Inc</a>)
dino@936 49 <dd><a href="mailto:cmarrin@apple.com">Chris Marrin</a> (<a
dino@936 50 href="http://www.apple.com/">Apple Inc</a>)
dbaron@4580 51 <dd class=vcard><a class=fn href="http://dbaron.org/">L. David Baron</a> (<a
dbaron@5320 52 class=org href="http://www.mozilla.org/">Mozilla</a>)
dbaron@4528 53
dbaron@4528 54 <dt>Issues list:
dbaron@4528 55 <dd><a href="https://www.w3.org/Bugs/Public/buglist.cgi?query_format=advanced&amp;product=CSS&amp;component=Transitions&amp;resolution=---&amp;cmdtype=doit">in Bugzilla</a>
dbaron@4528 56
fantasai@7857 57 <dt>Feedback:
dbaron@7921 58 <dd><a href="mailto:www-style@w3.org?subject=%5Bcss-transitions%5D%20feedback">www-style@w3.org</a>
fantasai@7857 59 with subject line &ldquo;<kbd>[css-transitions] <var>&hellip; message topic &hellip;</var></kbd>&rdquo;
fantasai@7857 60 (<a rel="discussion" href="http://lists.w3.org/Archives/Public/www-style/">archives</a>)
dbaron@5229 61
dbaron@4528 62 <dt>Test suite:
rhauck@9048 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>
dino@936 64 </dl>
dino@936 65
dino@936 66 <!--copyright-->
dino@936 67
dino@936 68 <hr title="Separator for header">
dino@936 69 </div>
dino@936 70
dino@936 71 <h2 class="no-num no-toc" id="abstract">Abstract</h2>
dino@936 72
dino@936 73 <p>CSS Transitions allows property changes in CSS values to occur smoothly
dino@936 74 over a specified duration.
dino@936 75
dino@936 76 <h2 class="no-num no-toc" id="status">Status of this document</h2>
dino@936 77 <!--status-->
dino@936 78
dbaron@7411 79 <h2 class="no-num no-toc" id="contents">Table of Contents</h2>
dino@936 80 <!--toc-->
dino@936 81
dino@936 82
dino@936 83 <h2 id="introduction">Introduction</h2>
dino@936 84
simon@1766 85 <p><em>This section is not normative.</em>
dino@936 86 <p>
dino@936 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.
dino@936 88 </p>
simon@1766 89
dbaron@5333 90 <h2 id="transitions"><a id="transitions-">Transitions</a></h2>
dino@936 91 <p>
dino@936 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.
dino@936 93 </p>
dino@936 94 <p>
dbaron@7301 95 For example, suppose that transitions of one second have been defined on the 'left' and
dbaron@7301 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.
dino@936 97 </p>
dino@936 98 <div class="figure">
dino@936 99 <img src="transition1.png" alt="">
dino@936 100 </div>
dino@936 101 <p class="caption">
dbaron@7301 102 Transitions of 'left' and 'background-color'
dino@936 103 </p>
dino@936 104 <p>
dino@936 105 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.
dino@936 106 </p>
dino@936 107 <p>
dino@936 108 Only animatable CSS properties can be transitioned. See the table at the end of this document for a list
dino@936 109 of properties that are animatable.
dino@936 110 </p>
dino@936 111 <p>
dino@936 112 The transition for a property is defined using a number of new properties. For example:
dino@936 113 </p>
dino@936 114 <div class="example">
dino@936 115 <p style="display:none">
dino@936 116 Example(s):
dino@936 117 </p>
dino@936 118 <pre>
dino@936 119 div {
dino@936 120 transition-property: opacity;
dino@936 121 transition-duration: 2s;
dino@936 122 }
dbaron@7301 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.
dino@936 124 </div>
dino@936 125 <p>
dino@936 126 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:
dino@936 127 </p>
dino@936 128 <div class="example">
dino@936 129 <p style="display:none">
dino@936 130 Example(s):
dino@936 131 </p>
dino@936 132 <pre>
dino@936 133 div {
dino@936 134 transition-property: opacity, left;
dino@936 135 transition-duration: 2s, 4s;
dino@936 136 }
dino@936 137
dbaron@7301 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.
dino@1469 139 </div>
dbaron@5231 140
dbaron@5247 141 <p id="list-matching">
dbaron@5231 142 In the case where the lists of values in transition properties
dbaron@5231 143 do not have the same length, the length of the
dbaron@5231 144 'transition-property' list determines the number of items in
dbaron@5231 145 each list examined when starting transitions. The lists are
dbaron@5231 146 matched up from the first value: excess values at the end are
dbaron@5231 147 not used. If one of the other properties doesn't have enough
dbaron@5231 148 comma-separated values to match the number of values of
dbaron@5231 149 'transition-property', the UA must calculate its used value by
dbaron@5231 150 repeating the list of values until there are enough. This
dbaron@5231 151 truncation or repetition does not affect the computed value.
dbaron@5231 152 <span class="note">
dbaron@5231 153 Note: This is analogous to the behavior of the 'background-*'
dbaron@5231 154 properties, with 'background-image' analogous to
dbaron@5231 155 'transition-property'.
dbaron@5231 156 </span>
dbaron@1542 157 </p>
dbaron@5231 158
dino@1469 159 <div class="example">
dino@1469 160 <p style="display:none">
dino@1469 161 Example(s):
dino@1469 162 </p>
dino@1469 163 <pre>
dino@1469 164 div {
dino@1469 165 transition-property: opacity, left, top, width;
dino@1469 166 transition-duration: 2s, 1s;
dino@1469 167 }
dbaron@7301 168 </pre>The above example defines a transition on the 'opacity' property of 2 seconds duration, a
dbaron@7301 169 transition on the 'left' property of 1
dbaron@7301 170 second duration, a transition on the 'top' property of 2 seconds duration and a
dbaron@7301 171 transition on the 'width' property of 1
dino@1469 172 second duration.
dino@1469 173
dino@1469 174 </div>
dbaron@7313 175
dbaron@7313 176 <p>
dbaron@7313 177 While authors can use transitions to create dynamically changing content,
dbaron@7313 178 dynamically changing content can lead to seizures in some users.
dbaron@7313 179 For information on how to avoid content that can lead to seizures, see
dbaron@7313 180 <a href="http://www.w3.org/TR/WCAG20/#seizure">Guideline 2.3:
dbaron@7313 181 Seizures:
dbaron@7313 182 Do not design content in a way that is known to cause seizures</a>
dbaron@7313 183 ([[WCAG20]]).
dbaron@7313 184 </p>
dbaron@7313 185
dino@1469 186 <!-- ======================================================================================================= -->
jackalmage@7183 187 <h3 id="transition-property-property"><a id="the-transition-property-property-">
dbaron@7301 188 The 'transition-property' Property
fantasai@5332 189 </a></h3>
dino@936 190 <p>
dbaron@7301 191 The 'transition-property' property specifies the name of the CSS property to which the transition is applied.
dino@936 192 </p>
dino@936 193 <table class="propdef">
dino@936 194 <tbody>
dino@936 195 <tr>
dino@936 196 <td>
dino@936 197 <em>Name:</em>
dino@936 198 </td>
dino@936 199 <td>
dino@936 200 <dfn id="transition-property">transition-property</dfn>
dino@936 201 </td>
dino@936 202 </tr>
dino@936 203 <tr>
dino@936 204 <td>
dino@936 205 <em>Value:</em>
dino@936 206 </td>
dino@936 207 <td>
dbaron@6739 208 none | <span>&lt;single-transition-property&gt;</span> [ ',' <span>&lt;single-transition-property&gt;</span> ]*
dino@936 209 </td>
dino@936 210 </tr>
dino@936 211 <tr>
dino@936 212 <td>
dino@936 213 <em>Initial:</em>
dino@936 214 </td>
dino@936 215 <td>
dino@936 216 all
dino@936 217 </td>
dino@936 218 </tr>
dino@936 219 <tr>
dino@936 220 <td>
dbaron@7405 221 <em>Applies to:</em>
dino@936 222 </td>
dino@936 223 <td>
dino@1469 224 all elements, :before and :after pseudo elements
dino@936 225 </td>
dino@936 226 </tr>
dino@936 227 <tr>
dino@936 228 <td>
dino@936 229 <em>Inherited:</em>
dino@936 230 </td>
dino@936 231 <td>
dino@936 232 no
dino@936 233 </td>
dino@936 234 </tr>
dino@936 235 <tr>
dino@936 236 <td>
dbaron@6734 237 <em>Animatable:</em>
dbaron@6734 238 </td>
dbaron@6734 239 <td>
dbaron@6734 240 no
dbaron@6734 241 </td>
dbaron@6734 242 </tr>
dbaron@6734 243 <tr>
dbaron@6734 244 <td>
dino@936 245 <em>Percentages:</em>
dino@936 246 </td>
dino@936 247 <td>
dino@936 248 N/A
dino@936 249 </td>
dino@936 250 </tr>
dino@936 251 <tr>
dino@936 252 <td>
dino@936 253 <em>Media:</em>
dino@936 254 </td>
dino@936 255 <td>
dino@936 256 visual
dino@936 257 </td>
dino@936 258 </tr>
dino@936 259 <tr>
dino@936 260 <td>
dino@936 261 <em>Computed value:</em>
dino@936 262 </td>
dino@936 263 <td>
dino@936 264 Same as specified value.
dino@936 265 </td>
dino@936 266 </tr>
dbaron@6734 267 <tr>
dbaron@6734 268 <td>
dbaron@6734 269 <em>Canonical order:</em>
dbaron@6734 270 </td>
dbaron@6734 271 <td>
dbaron@6734 272 <abbr title="follows order of property value definition">per grammar</abbr>
dbaron@6734 273 </td>
dbaron@6734 274 </tr>
dino@936 275 </tbody>
dino@936 276 </table>
dino@936 277
dbaron@6736 278 <div class="prod">
dbaron@6739 279 <dfn id="single-transition-property">&lt;single-transition-property&gt;</dfn> = all | &lt;IDENT&gt;
dbaron@6736 280 </div>
dbaron@6736 281
dino@936 282 <p>
dbaron@7300 283 A value of ''none'' means that no property will transition.
dbaron@4537 284 Otherwise, a list of properties to be transitioned, or the
dbaron@7300 285 keyword ''all'' which indicates that all properties are to be
dbaron@4537 286 transitioned, is given.
dino@936 287 </p>
dino@936 288
dbaron@1543 289 <p>
dbaron@1543 290 If one of the identifiers listed is not a recognized property
dbaron@1543 291 name or is not an animatable property, the implementation must
dbaron@1543 292 still start transitions on the animatable properties in the
dbaron@1543 293 list using the duration, delay, and timing function at their
dbaron@1543 294 respective indices in the lists for 'transition-duration',
dbaron@1543 295 'transition-delay', and 'transition-timing-function'. In other
dbaron@1543 296 words, unrecognized or non-animatable properties must be kept in
dbaron@1543 297 the list to preserve the matching of indices.
dbaron@1543 298 </p>
dbaron@7298 299
dbaron@7298 300 <p>
dbaron@7298 301 The keywords ''none'', ''inherit'', and ''initial'' are not
dbaron@7298 302 permitted as items within a list of more that one identifier;
dbaron@7298 303 any list that uses them is syntactically invalid.
dbaron@7298 304 In other words, the &lt;IDENT&gt; production in
dbaron@7298 305 <span>&lt;single-transition-property&gt;</span> matches any
dbaron@7298 306 identifier other than these three keywords.
dbaron@1543 307 </p>
dbaron@7298 308
dbaron@1543 309 <p>
dbaron@7300 310 For the keyword ''all'', or if one of the identifiers listed is a
dbaron@4537 311 shorthand property, implementations must start transitions for
dbaron@4537 312 any of its longhand sub-properties that are animatable (or, for
dbaron@7300 313 ''all'', all animatable properties), using the duration, delay,
dbaron@1543 314 and timing function at the index corresponding to the shorthand.
dbaron@1543 315 </p>
dbaron@1543 316 <p>
dbaron@1543 317 If a property is specified multiple times in the value of
dbaron@4537 318 'transition-property' (either on its own, via a shorthand that
dbaron@7300 319 contains it, or via the ''all'' value), then the transition that
dbaron@4537 320 starts uses the duration, delay, and timing function at the
dbaron@4537 321 index corresponding to the <em>last</em> item in the value of
dbaron@4543 322 'transition-property' that calls for animating that property.
dbaron@4537 323 </p>
dbaron@4537 324 <p class="note">
dbaron@7300 325 Note: The ''all'' value and 'all' shorthand
dbaron@7300 326 property work in similar ways, so the
dbaron@7300 327 ''all'' value is just like a shorthand that
dbaron@4537 328 covers all properties.
dbaron@1543 329 </p>
dbaron@1543 330
dbaron@1543 331 <!-- ======================================================================================================= -->
jackalmage@7183 332 <h3 id="transition-duration-property"><a id="the-transition-duration-property-">
dbaron@7301 333 The 'transition-duration' Property
fantasai@5332 334 </a></h3>
dino@936 335 <p>
dbaron@7301 336 The 'transition-duration' property defines the length of time that a transition takes.
dino@936 337 </p>
dino@936 338 <table class="propdef">
dino@936 339 <tbody>
dino@936 340 <tr>
dino@936 341 <td>
dino@936 342 <em>Name:</em>
dino@936 343 </td>
dino@936 344 <td>
dino@936 345 <dfn id="transition-duration">transition-duration</dfn>
dino@936 346 </td>
dino@936 347 </tr>
dino@936 348 <tr>
dino@936 349 <td>
dino@936 350 <em>Value:</em>
dino@936 351 </td>
dino@936 352 <td>
dbaron@6739 353 <span>&lt;time&gt;</span> [, <span>&lt;time&gt;</span>]*
dino@936 354 </td>
dino@936 355 </tr>
dino@936 356 <tr>
dino@936 357 <td>
dino@936 358 <em>Initial:</em>
dino@936 359 </td>
dino@936 360 <td>
dino@3189 361 0s
dino@936 362 </td>
dino@936 363 </tr>
dino@936 364 <tr>
dino@936 365 <td>
dbaron@7405 366 <em>Applies to:</em>
dino@936 367 </td>
dino@936 368 <td>
dino@1469 369 all elements, :before and :after pseudo elements
dino@936 370 </td>
dino@936 371 </tr>
dino@936 372 <tr>
dino@936 373 <td>
dino@936 374 <em>Inherited:</em>
dino@936 375 </td>
dino@936 376 <td>
dino@936 377 no
dino@936 378 </td>
dino@936 379 </tr>
dino@936 380 <tr>
dino@936 381 <td>
dbaron@6734 382 <em>Animatable:</em>
dbaron@6734 383 </td>
dbaron@6734 384 <td>
dbaron@6734 385 no
dbaron@6734 386 </td>
dbaron@6734 387 </tr>
dbaron@6734 388 <tr>
dbaron@6734 389 <td>
dino@936 390 <em>Percentages:</em>
dino@936 391 </td>
dino@936 392 <td>
dino@936 393 N/A
dino@936 394 </td>
dino@936 395 </tr>
dino@936 396 <tr>
dino@936 397 <td>
dino@936 398 <em>Media:</em>
dino@936 399 </td>
dino@936 400 <td>
dino@1469 401 interactive
dino@936 402 </td>
dino@936 403 </tr>
dino@936 404 <tr>
dino@936 405 <td>
dino@936 406 <em>Computed value:</em>
dino@936 407 </td>
dino@936 408 <td>
dino@936 409 Same as specified value.
dino@936 410 </td>
dino@936 411 </tr>
dbaron@6734 412 <tr>
dbaron@6734 413 <td>
dbaron@6734 414 <em>Canonical order:</em>
dbaron@6734 415 </td>
dbaron@6734 416 <td>
dbaron@6734 417 <abbr title="follows order of property value definition">per grammar</abbr>
dbaron@6734 418 </td>
dbaron@6734 419 </tr>
dino@936 420 </tbody>
dino@936 421 </table>
dino@936 422 <p>
dbaron@7301 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.
dino@936 424 </p>
dino@936 425
dino@936 426 <!-- =======================================================================================================
dino@936 427 -->
dino@936 428
jackalmage@7183 429 <h3 id="transition-timing-function-property"><a id="transition-timing-function_tag">
dbaron@7301 430 The 'transition-timing-function' Property
fantasai@5332 431 </a></h3>
dino@936 432 <p>
dbaron@7301 433 The 'transition-timing-function' property
dino@936 434 describes how the intermediate values used during a transition will be
dino@936 435 calculated. It allows for a transition to change speed over its
dino@936 436 duration. These effects are commonly called <em>easing</em> functions.
dino@936 437 In either case, a mathematical function that provides a smooth curve is
dino@936 438 used.
dino@936 439 </p>
dino@936 440 <p>
dino@1907 441 Timing functions are either defined as a stepping function or
dino@1907 442 a <a
dino@936 443 href="http://en.wikipedia.org/wiki/B%C3%A9zier_curve#Cubic_B.C3.A9zier_curves">cubic
dbaron@4550 444 B&eacute;zier curve</a>.
dbaron@6223 445 The timing function takes as its input
dbaron@6223 446 the current elapsed percentage of the transition duration
dbaron@6223 447 and outputs the percentage of the way the transition is
dbaron@6223 448 from its start value to its end value.
dbaron@6223 449 How this output is used is defined by
dbaron@6223 450 the <a href="#animatable-types">interpolation rules</a>
dbaron@6223 451 for the value type.
dino@1907 452 </p>
dino@1907 453 <p>
dino@1907 454 A <a href="http://en.wikipedia.org/wiki/Step_function">stepping</a>
dino@1907 455 function is defined by a number that divides the domain of operation
dino@1907 456 into equally sized intervals. Each subsequent interval is a equal step
dino@1907 457 closer to the goal state. The function also specifies whether the
dino@1907 458 change in output percentage happens at the start or end of the
dino@1907 459 interval (in other words, if 0% on the input percentage is the point
dino@1907 460 of initial change).
dino@1907 461 </p>
dino@1907 462 <div class="figure">
dino@1907 463 <img src="step.png" alt="The step timing function splits
dino@1907 464 the function domain into a number of disjoint straight line
dino@1907 465 segments. steps(1, start) is a function whose
dino@1907 466 output value is 1 for all input values. steps(1, end) is a function whose
dino@1907 467 output value is 0 for all input values less than 1, and output
dino@1907 468 is 1 for the input value of 1. steps(3, start) is a function that
dino@1907 469 divides the input domain into three segments, each 1/3 in length,
dino@1907 470 and 1/3 above the previous segment, with the first segment starting
dino@1907 471 at 1/3. steps(3, end) is a function that
dino@1907 472 divides the input domain into three segments, each 1/3 in length,
dino@1907 473 and 1/3 above the previous segment, with the first segment starting
dino@1907 474 at 0.">
dino@1907 475 </div>
dino@1907 476 <p class="caption">
dino@1907 477 Step timing functions
dino@1907 478 </p>
dino@1907 479 <p>
dino@1907 480 A <a
dino@1907 481 href="http://en.wikipedia.org/wiki/B%C3%A9zier_curve#Cubic_B.C3.A9zier_curves">cubic
dbaron@4550 482 B&eacute;zier curve</a> is defined by four control points, P<sub>0</sub>
dino@936 483 through P<sub>3</sub> (see Figure 1). P<sub>0</sub> and P<sub>3</sub>
dbaron@7301 484 are always set to (0,0) and (1,1). The 'transition-timing-function' property is used
dino@936 485 to specify the values for points P<sub>1</sub> and P<sub>2</sub>. These
dino@936 486 can be set to preset values using the keywords listed below, or can be
dbaron@7301 487 set to specific values using the ''cubic-bezier'' function.
dbaron@7301 488 In the ''cubic-bezier'' function, P<sub>1</sub> and
dino@936 489 P<sub>2</sub> are each specified by both an X and Y value.
dino@936 490 </p>
dino@936 491 <div class="figure">
dbaron@4550 492 <img src="TimingFunction.png" alt="The B&eacute;zier timing function is a
dino@1907 493 smooth curve from point P0 = (0,0) to point P3 = (1,1). The
dino@1907 494 length and orientation of the line segment P0-P1 determines
dino@1907 495 the tangent and the curvature of the curve at P0 and the
dino@1907 496 line segment P2-P3 does the same at P3.">
dino@936 497 </div>
dino@936 498 <p class="caption">
dbaron@4550 499 B&eacute;zier Timing Function Control Points
dino@936 500 </p>
dino@936 501 <table class="propdef">
dino@936 502 <tbody>
dino@936 503 <tr>
dino@936 504 <td>
dino@936 505 <em>Name:</em>
dino@936 506 </td>
dino@936 507 <td>
dino@936 508 <dfn id="transition-timing-function">transition-timing-function</dfn>
dino@936 509 </td>
dino@936 510 </tr>
dino@936 511 <tr>
dino@936 512 <td>
dino@936 513 <em>Value:</em>
dino@936 514 </td>
dino@936 515 <td>
dbaron@6739 516 <span>&lt;single-transition-timing-function&gt;</span> [ ',' <span>&lt;single-transition-timing-function&gt;</span> ]*
dino@936 517 </td>
dino@936 518 </tr>
dino@936 519 <tr>
dino@936 520 <td>
dino@936 521 <em>Initial:</em>
dino@936 522 </td>
dino@936 523 <td>
dino@936 524 ease
dino@936 525 </td>
dino@936 526 </tr>
dino@936 527 <tr>
dino@936 528 <td>
dbaron@7405 529 <em>Applies to:</em>
dino@936 530 </td>
dino@936 531 <td>
dino@1469 532 all elements, :before and :after pseudo elements
dino@936 533 </td>
dino@936 534 </tr>
dino@936 535 <tr>
dino@936 536 <td>
dino@936 537 <em>Inherited:</em>
dino@936 538 </td>
dino@936 539 <td>
dino@936 540 no
dino@936 541 </td>
dino@936 542 </tr>
dino@936 543 <tr>
dino@936 544 <td>
dbaron@6734 545 <em>Animatable:</em>
dbaron@6734 546 </td>
dbaron@6734 547 <td>
dbaron@6734 548 no
dbaron@6734 549 </td>
dbaron@6734 550 </tr>
dbaron@6734 551 <tr>
dbaron@6734 552 <td>
dino@936 553 <em>Percentages:</em>
dino@936 554 </td>
dino@936 555 <td>
dino@936 556 N/A
dino@936 557 </td>
dino@936 558 </tr>
dino@936 559 <tr>
dino@936 560 <td>
dino@936 561 <em>Media:</em>
dino@936 562 </td>
dino@936 563 <td>
dino@1469 564 interactive
dino@936 565 </td>
dino@936 566 </tr>
dino@936 567 <tr>
dino@936 568 <td>
dino@936 569 <em>Computed value:</em>
dino@936 570 </td>
dino@936 571 <td>
dino@936 572 Same as specified value.
dino@936 573 </td>
dino@936 574 </tr>
dbaron@6734 575 <tr>
dbaron@6734 576 <td>
dbaron@6734 577 <em>Canonical order:</em>
dbaron@6734 578 </td>
dbaron@6734 579 <td>
dbaron@6734 580 <abbr title="follows order of property value definition">per grammar</abbr>
dbaron@6734 581 </td>
dbaron@6734 582 </tr>
dino@936 583 </tbody>
dino@936 584 </table>
dbaron@6736 585 <div class="prod">
dbaron@6739 586 <dfn id="single-transition-timing-function">&lt;single-transition-timing-function&gt;</dfn> = ease | linear | ease-in | ease-out | ease-in-out | step-start | step-end | steps(&lt;integer&gt;[, [ start | end ] ]?) | cubic-bezier(&lt;number&gt;, &lt;number&gt;, &lt;number&gt;, &lt;number&gt;)
dbaron@6736 587 </div>
dino@936 588 <p>
dino@936 589 The timing functions have the following definitions.
dino@936 590 </p>
dino@936 591 <dl>
dino@936 592 <dt>
dino@936 593 ease
dino@936 594 </dt>
dino@936 595 <dd>
dino@7174 596 The ease function is equivalent to cubic-bezier(0.25, 0.1, 0.25, 1).
dino@936 597 </dd>
dino@936 598 <dt>
dino@936 599 linear
dino@936 600 </dt>
dino@936 601 <dd>
dino@7174 602 The linear function is equivalent to cubic-bezier(0, 0, 1, 1).
dino@936 603 </dd>
dino@936 604 <dt>
dino@936 605 ease-in
dino@936 606 </dt>
dino@936 607 <dd>
dino@7174 608 The ease-in function is equivalent to cubic-bezier(0.42, 0, 1, 1).
dino@936 609 </dd>
dino@936 610 <dt>
dino@936 611 ease-out
dino@936 612 </dt>
dino@936 613 <dd>
dino@7174 614 The ease-out function is equivalent to cubic-bezier(0, 0, 0.58, 1).
dino@936 615 </dd>
dino@936 616 <dt>
dino@936 617 ease-in-out
dino@936 618 </dt>
dino@936 619 <dd>
dino@7174 620 The ease-in-out function is equivalent to cubic-bezier(0.42, 0, 0.58, 1)
dino@936 621 </dd>
dino@936 622 <dt>
dino@1907 623 step-start
dino@1907 624 </dt>
dino@1907 625 <dd>
dino@1907 626 The step-start function is equivalent to steps(1, start).
dino@1907 627 </dd>
dino@1907 628 <dt>
dino@1907 629 step-end
dino@1907 630 </dt>
dino@1907 631 <dd>
dino@1907 632 The step-end function is equivalent to steps(1, end).
dino@1907 633 </dd>
dino@1907 634 <dt>
dbaron@5759 635 steps(&lt;integer&gt;[, [ start | end ] ]?)
dino@1907 636 </dt>
dino@1907 637 <dd>
dino@1907 638 Specifies a stepping function, described above, taking two
dino@1907 639 parameters. The first parameter specifies the number of intervals
dino@2615 640 in the function. It must be a positive integer (greater than 0).
dino@2615 641 The second parameter, which is optional, is
dbaron@7300 642 either the value ''start'' or ''end'', and specifies the point
dino@1907 643 at which the change of values occur within the interval.
dino@1907 644 If the second parameter is omitted, it is given the value 'end'.
dino@1907 645 </dd>
dino@1907 646 <dt>
dbaron@5759 647 cubic-bezier(&lt;number&gt;, &lt;number&gt;, &lt;number&gt;, &lt;number&gt;)
dino@936 648 </dt>
dino@936 649 <dd>
dino@936 650 Specifies a <a
dino@936 651 href="http://en.wikipedia.org/wiki/B%C3%A9zier_curve">cubic-bezier
dino@936 652 curve</a>. The four values specify points P<sub>1</sub> and
dino@2615 653 P<sub>2</sub> of the curve as (x1, y1, x2, y2). Both x values must be
dino@2615 654 in the range [0, 1] or the definition is invalid. The y values can
dino@2615 655 exceed this range.
dino@936 656 </dd>
dino@936 657 </dl><!-- ======================================================================================================= -->
jackalmage@7183 658 <h3 id="transition-delay-property"><a id="the-transition-delay-property-">
dbaron@7301 659 The 'transition-delay' Property
fantasai@5332 660 </a></h3>
dino@936 661 <p>
dbaron@7301 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.
dino@936 663 </p>
dino@936 664 <p>
dbaron@7301 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.
dino@936 666 </p>
dino@936 667 <table class="propdef">
dino@936 668 <tbody>
dino@936 669 <tr>
dino@936 670 <td>
dino@936 671 <em>Name:</em>
dino@936 672 </td>
dino@936 673 <td>
dino@936 674 <dfn id="transition-delay">transition-delay</dfn>
dino@936 675 </td>
dino@936 676 </tr>
dino@936 677 <tr>
dino@936 678 <td>
dino@936 679 <em>Value:</em>
dino@936 680 </td>
dino@936 681 <td>
dbaron@6739 682 <span>&lt;time&gt;</span> [, <span>&lt;time&gt;</span>]*
dino@936 683 </td>
dino@936 684 </tr>
dino@936 685 <tr>
dino@936 686 <td>
dino@936 687 <em>Initial:</em>
dino@936 688 </td>
dino@936 689 <td>
dino@3189 690 0s
dino@936 691 </td>
dino@936 692 </tr>
dino@936 693 <tr>
dino@936 694 <td>
dbaron@7405 695 <em>Applies to:</em>
dino@936 696 </td>
dino@936 697 <td>
dino@1469 698 all elements, :before and :after pseudo elements
dino@936 699 </td>
dino@936 700 </tr>
dino@936 701 <tr>
dino@936 702 <td>
dino@936 703 <em>Inherited:</em>
dino@936 704 </td>
dino@936 705 <td>
dino@936 706 no
dino@936 707 </td>
dino@936 708 </tr>
dino@936 709 <tr>
dino@936 710 <td>
dbaron@6734 711 <em>Animatable:</em>
dbaron@6734 712 </td>
dbaron@6734 713 <td>
dbaron@6734 714 no
dbaron@6734 715 </td>
dbaron@6734 716 </tr>
dbaron@6734 717 <tr>
dbaron@6734 718 <td>
dino@936 719 <em>Percentages:</em>
dino@936 720 </td>
dino@936 721 <td>
dino@936 722 N/A
dino@936 723 </td>
dino@936 724 </tr>
dino@936 725 <tr>
dino@936 726 <td>
dino@936 727 <em>Media:</em>
dino@936 728 </td>
dino@936 729 <td>
dino@1469 730 interactive
dino@936 731 </td>
dino@936 732 </tr>
dino@936 733 <tr>
dino@936 734 <td>
dino@936 735 <em>Computed value:</em>
dino@936 736 </td>
dino@936 737 <td>
dino@936 738 Same as specified value.
dino@936 739 </td>
dino@936 740 </tr>
dbaron@6734 741 <tr>
dbaron@6734 742 <td>
dbaron@6734 743 <em>Canonical order:</em>
dbaron@6734 744 </td>
dbaron@6734 745 <td>
dbaron@6734 746 <abbr title="follows order of property value definition">per grammar</abbr>
dbaron@6734 747 </td>
dbaron@6734 748 </tr>
dino@936 749 </tbody>
dino@936 750 </table><!-- ======================================================================================================= -->
jackalmage@7183 751 <h3 id="transition-shorthand-property"><a id="the-transition-shorthand-property-">
dbaron@7301 752 The 'transition' Shorthand Property
fantasai@5332 753 </a></h3>
dino@936 754 <p>
dbaron@7301 755 The 'transition' shorthand property combines the four properties described above into a single property.
dino@936 756 </p>
dino@936 757 <table class="propdef">
dino@936 758 <tbody>
dino@936 759 <tr>
dino@936 760 <td>
dino@936 761 <em>Name:</em>
dino@936 762 </td>
dino@936 763 <td>
dino@936 764 <dfn id="transition">transition</dfn>
dino@936 765 </td>
dino@936 766 </tr>
dino@936 767 <tr>
dino@936 768 <td>
dino@936 769 <em>Value:</em>
dino@936 770 </td>
dino@936 771 <td>
dbaron@6739 772 <span>&lt;single-transition&gt;</span> [ ',' <span>&lt;single-transition&gt;</span> ]*
dino@936 773 </td>
dino@936 774 </tr>
dino@936 775 <tr>
dino@936 776 <td>
dino@936 777 <em>Initial:</em>
dino@936 778 </td>
dino@936 779 <td>
dino@936 780 see individual properties
dino@936 781 </td>
dino@936 782 </tr>
dino@936 783 <tr>
dino@936 784 <td>
dbaron@7405 785 <em>Applies to:</em>
dino@936 786 </td>
dino@936 787 <td>
dino@1469 788 all elements, :before and :after pseudo elements
dino@936 789 </td>
dino@936 790 </tr>
dino@936 791 <tr>
dino@936 792 <td>
dino@936 793 <em>Inherited:</em>
dino@936 794 </td>
dino@936 795 <td>
dino@936 796 no
dino@936 797 </td>
dino@936 798 </tr>
dino@936 799 <tr>
dino@936 800 <td>
dbaron@6734 801 <em>Animatable:</em>
dbaron@6734 802 </td>
dbaron@6734 803 <td>
dbaron@6734 804 no
dbaron@6734 805 </td>
dbaron@6734 806 </tr>
dbaron@6734 807 <tr>
dbaron@6734 808 <td>
dino@936 809 <em>Percentages:</em>
dino@936 810 </td>
dino@936 811 <td>
dino@936 812 N/A
dino@936 813 </td>
dino@936 814 </tr>
dino@936 815 <tr>
dino@936 816 <td>
dino@936 817 <em>Media:</em>
dino@936 818 </td>
dino@936 819 <td>
dino@1469 820 interactive
dino@936 821 </td>
dino@936 822 </tr>
dino@936 823 <tr>
dino@936 824 <td>
dino@936 825 <em>Computed value:</em>
dino@936 826 </td>
dino@936 827 <td>
dbaron@7810 828 see individual properties
dino@936 829 </td>
dino@936 830 </tr>
dbaron@6734 831 <tr>
dbaron@6734 832 <td>
dbaron@6734 833 <em>Canonical order:</em>
dbaron@6734 834 </td>
dbaron@6734 835 <td>
dbaron@6734 836 <abbr title="follows order of property value definition">per grammar</abbr>
dbaron@6734 837 </td>
dbaron@6734 838 </tr>
dino@936 839 </tbody>
dino@936 840 </table>
dino@1531 841
dbaron@6736 842 <div class="prod">
dbaron@6739 843 <dfn id="single-transition">&lt;single-transition&gt;</dfn> = [ none | <span>&lt;single-transition-property&gt;</span> ] || <span>&lt;time&gt;</span> || <span>&lt;single-transition-timing-function&gt;</span> || <span>&lt;time&gt;</span>
dbaron@6736 844 </div>
dbaron@6736 845
dbaron@6736 846 <p>
dbaron@6736 847 Note that order is important within the items in this property:
dbaron@6736 848 the first value that can be parsed as a time is assigned to the
dbaron@6736 849 transition-duration,
dbaron@6736 850 and the second value that can be parsed as a time is assigned to
dbaron@6736 851 transition-delay.
dbaron@6736 852 </p>
dbaron@6736 853
dbaron@6736 854 <p>
dbaron@6739 855 If there is more than one <span>&lt;single-transition&gt;</span> in the shorthand,
dbaron@6736 856 and any of the transitions has
dbaron@6739 857 ''none'' as the <span>&lt;single-transition-property&gt;</span>,
dbaron@6736 858 then the declaration is invalid.
dbaron@6736 859 </p>
dbaron@6736 860
dbaron@1540 861 <h2 id="starting">
dbaron@1540 862 Starting of transitions
dbaron@1540 863 </h2>
dbaron@1540 864
dbaron@1540 865 <p>
dbaron@2569 866 When the computed value of an animatable property changes,
dbaron@1548 867 implementations must decide what transitions to start based on
dbaron@1548 868 the values of the 'transition-property', 'transition-duration',
dbaron@1548 869 'transition-timing-function', and 'transition-delay' properties
dbaron@2569 870 at the time the animatable property would first have its new
dbaron@2570 871 computed value.
dbaron@7516 872 This means that when one of these 'transition-*' properties
dbaron@7516 873 changes at the same time as
dbaron@7516 874 a property whose change might transition,
dbaron@7516 875 it is the <em>new</em> values of the 'transition-*' properties
dbaron@7516 876 that control the transition.
dbaron@2570 877 </p>
dbaron@5243 878 <div class="example" id="manual-reversing-example">
dbaron@2570 879 <p style="display:none">
dbaron@2570 880 Example(s):
dbaron@2570 881 </p>
dbaron@5243 882 <p>This provides a way for authors to specify different values
dbaron@5243 883 of the 'transition-*' properties for the &ldquo;forward&rdquo;
dbaron@5243 884 and &ldquo;reverse&rdquo; transitions (but see <a
dbaron@5243 885 href="#reversing">below</a> for special reversing behavior when
dbaron@5243 886 an <em>incomplete</em> transition is interrupted). Authors can
dbaron@5243 887 specify the value of 'transition-duration',
dbaron@5243 888 'transition-timing-function', or 'transition-delay' in the same
dbaron@5243 889 rule where they specify the value that triggers the transition,
dbaron@5243 890 or can change these properties at the same time as they change
dbaron@5243 891 the property that triggers the transition. Since it's the new
dbaron@5243 892 values of these 'transition-*' properties that affect the
dbaron@5243 893 transition, these values will be used for the transitions
dbaron@5243 894 <em>to</em> the associated transitioning values. For example:
dbaron@5243 895 </p>
dbaron@5243 896 <pre>li {
dbaron@5243 897 transition: background-color linear 1s;
dbaron@5243 898 background: blue;
dbaron@5243 899 }
dbaron@5243 900 li:hover {
dbaron@5243 901 background-color: green;
dbaron@5243 902 transition-duration: 2s; /* applies to the transition *to* the :hover state */
dbaron@5243 903 }</pre>
dbaron@2570 904 <p>
dbaron@2570 905 When a list item with these style rules enters the :hover
dbaron@2570 906 state, the computed 'transition-duration' at the time that
dbaron@7300 907 'background-color' would have its new value (''green'') is ''2s'',
dbaron@2570 908 so the transition from 'blue' to 'green' takes 2 seconds.
dbaron@2570 909 However, when the list item leaves the :hover state, the
dbaron@7300 910 transition from ''green'' to ''blue'' takes 1 second.
dbaron@2570 911 </p>
dbaron@2570 912 </div>
dbaron@5247 913
dbaron@5247 914 <p>
dbaron@5247 915 When the computed value of a property changes, implementations
dbaron@5247 916 must start transitions based on the relevant item (see <a
dbaron@5248 917 href="#transition-property">the definition of
dbaron@5247 918 'transition-property'</a>) in the computed value of
dbaron@5542 919 'transition-property'.
dbaron@5542 920 Corresponding to this item there are
dbaron@5542 921 computed values of 'transition-duration' and 'transition-delay'
dbaron@5542 922 (see <a href="#list-matching">the rules on matching lists</a>).
dbaron@5542 923 Define the <dfn>combined duration</dfn> of the transition
dbaron@7300 924 as the sum of max('transition-duration', ''0s'') and 'transition-delay'.
dbaron@7300 925 When the combined duration is greater than ''0s'',
dbaron@5542 926 then a transition starts based on the values of
dbaron@5542 927 'transition-duration', 'transition-delay',
dbaron@5542 928 and 'transition-timing-function';
dbaron@5542 929 in other cases transitions do not occur.
dbaron@5247 930 </p>
dbaron@5247 931
dbaron@2570 932 <p>
dbaron@2570 933 Since this specification does not define
dbaron@2569 934 when computed values change, and thus what changes to
dbaron@2569 935 computed values are considered simultaneous,
dbaron@1548 936 authors should be aware that changing any of the transition
dbaron@1548 937 properties a small amount of time after making a change that
dbaron@1548 938 might transition can result in behavior that varies between
dbaron@1548 939 implementations, since the changes might be considered
dbaron@1548 940 simultaneous in some implementations but not others.
dbaron@1540 941 </p>
dbaron@1540 942
dbaron@1540 943 <p>
dbaron@1548 944 Once the transition of a property has started, it must continue
dbaron@1548 945 running based on the original timing function, duration, and
dbaron@1548 946 delay, even if the 'transition-timing-function',
dbaron@1548 947 'transition-duration', or 'transition-delay' property changes
dbaron@1548 948 before the transition is complete. However, if the
dbaron@1548 949 'transition-property' property changes such that the transition
dbaron@1548 950 would not have started, the transition must stop (and the
dbaron@1548 951 property must immediately change to its final value).
dbaron@1540 952 </p>
dbaron@1540 953
dbaron@1540 954 <p>
dbaron@1548 955 Implementations must not start a transition when the computed
dbaron@1548 956 value of a property changes as a result of declarative animation
dbaron@1548 957 (as opposed to scripted animation).
dbaron@1540 958 </p>
dbaron@1540 959
dbaron@1540 960 <p>
dbaron@1548 961 Implementations also must not start a transition when the
dbaron@1548 962 computed value changes because it is inherited (directly or
dbaron@1548 963 indirectly) from another element that is transitioning the same
dbaron@1548 964 property.
dbaron@1540 965 </p>
dbaron@1540 966
dbaron@8348 967 <p class="issue">
dbaron@8348 968 Issue: These rules don't define a model clearly enough to define
dbaron@8348 969 the behavior in harder cases, such when transition properties
dbaron@8348 970 are present on both ancestor and descendant. See
dbaron@8348 971 <a href="http://lists.w3.org/Archives/Public/www-style/2013Mar/0297.html">description of issues and proposed model</a>.
dbaron@8380 972 Working Group resolution from 2013-06-06 needs to be edited.
dbaron@8348 973 </p>
dbaron@8348 974
dino@1531 975 <h2 id="reversing">
dbaron@5243 976 Automatically reversing interrupted transitions
dino@1531 977 </h2>
dino@1531 978 <p>
dino@1531 979 A common type of transition effect is when a running transition is
dino@1531 980 interrupted and the property is reset to its original value. An
dino@1531 981 example is a hover effect on an element, where the pointer enters and
dino@1531 982 exits the element before the effect has completed. If the outgoing and
dino@1531 983 incoming transitions are executed using their specified durations and
dino@1531 984 timing functions, the resulting effect can be distractingly
dino@1531 985 asymmetric. Instead, the expected behavior is that the new transition
dino@1531 986 should be the reverse of what has already executed.
dino@1531 987 </p>
dino@1532 988
dino@1531 989 <p>
dino@1532 990 If a running transition with duration T, executing so far for duration TE,
dino@1532 991 from state A, to state B, is interrupted by
dino@1532 992 a property change that would start a new transition back to state A, and
dino@1532 993 all the transition attributes are the same (duration, delay and timing function),
dino@1532 994 then the new transition must reverse the effect. The new transition must:
dino@1531 995 </p>
dino@1532 996
dino@1532 997 <ol>
dino@1532 998 <li>
dino@1532 999 Use the B and A states as its "from" and "to" states respectively. It
dino@1532 1000 does not use the current value as its from state, due to the rules below.
dino@1532 1001 </li>
dino@1532 1002 <li>
dino@1532 1003 Execute with the same duration T, but starting as if the transition had
dino@1532 1004 already begun, without any transition delay, at the moment which would
dino@1532 1005 cause the new transition to finish in TE from the moment of interruption. In other
dino@1532 1006 words, the new transition will execute as if it started T-TE in the past.
dino@1532 1007 </li>
dino@1532 1008 <li>
dino@1532 1009 Use a timing function that is the portion of the curve traversed up
dino@1532 1010 to the moment of interruption, followed in the opposite direction (towards
dino@1532 1011 the starting point). This will make the transition appear as if it
dino@1532 1012 is playing backwards.
dino@1532 1013 </li>
dino@1532 1014 <li>
dino@1532 1015 Ignore any transition delay.
dino@1532 1016 </li>
dino@1532 1017 </ol>
dino@1532 1018
dino@1531 1019 <p>
dino@1531 1020 For example, suppose there is a transition with a duration of two
dino@1531 1021 seconds. If this transition is interrupted after 0.5 seconds and the
dino@1531 1022 property value assigned to the original value, then the new transition
dino@1531 1023 effect will be the reverse of the original, as if it had begun
dino@1531 1024 1.5 seconds in the past.
dino@1531 1025 </p>
dino@936 1026
dino@1532 1027 <p>
dino@1532 1028 Note that by using the defined from and to states for the reversing
dino@1532 1029 transition, it is also possible that it may reverse again, if
dino@1532 1030 interrupted; for example, if the transition reversing to state A was
dino@1532 1031 again interrupted by a property change to state B.
dino@1532 1032 </p>
dino@1532 1033
dbaron@2568 1034 <p class="issue">Issue:
dbaron@2568 1035 This introduces the concept of reversing a timing function,
dbaron@2568 1036 which the spec has otherwise resisted doing, and also introduces
dbaron@2568 1037 a discontinuity between transitions that have
dbaron@2568 1038 almost completed (which get automatically reversed and thus have
dbaron@2568 1039 their timing function reversed) and transitions that have fully
dbaron@2568 1040 completed (where the reversal doesn't lead to the timing
dbaron@2568 1041 function being reversed). An alternative proposal that avoids
dbaron@2568 1042 this is to follow the normal timing function algorithm, except
dbaron@2568 1043 multiply the duration (and also shorten any negative delay) by
dbaron@2568 1044 the (output) value of the transition timing function of the
dbaron@2568 1045 incomplete transition at the time it was interrupted, and, to
dbaron@2568 1046 account for multiple reverses in sequence, to divide by the
dbaron@2568 1047 shortening applied to the transition being interrupted. For
dbaron@2568 1048 more details see this thread:
dbaron@2568 1049 <a href="http://lists.w3.org/Archives/Public/www-style/2009Nov/thread.html#msg302">November 2009 part</a>,
dbaron@2568 1050 <a href="http://lists.w3.org/Archives/Public/www-style/2009Dec/thread.html#msg319">December 2009 part</a>,
dbaron@2568 1051 <a href="http://lists.w3.org/Archives/Public/www-style/2010Jan/thread.html#msg136">January 2010 part</a>.
dbaron@8348 1052 Also see:
dbaron@8348 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>),
dbaron@8380 1054 <a href="http://lists.w3.org/Archives/Public/www-style/2012Nov/0262.html">minutes 2012-10-30</a>,
dbaron@8380 1055 <a href="transition-reversing-demo">reversing demo</a>.
dbaron@8380 1056 Working Group resolution from 2013-06-07 needs to be edited.
dbaron@2568 1057 </p>
dbaron@2568 1058
jackalmage@7183 1059 <h2 id="transition-events"><a id="transition-events-">
dino@936 1060 Transition Events
fantasai@5332 1061 </a></h2>
dino@936 1062 <p>
dino@936 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>.
dino@936 1064 An event is fired for each property that undergoes a transition.
dino@936 1065 This allows a content developer to perform actions that synchronize
dino@936 1066 with the completion of a transition.
dino@936 1067 </p>
dino@936 1068 <p>
dino@936 1069 Each event provides the name of the property the transition is
dino@936 1070 associated with as well as the duration of the transition.
dino@936 1071 </p>
dino@936 1072 <dl>
dino@936 1073 <dt>
dbaron@7403 1074 <b>Interface <dfn id="Events-TransitionEvent">TransitionEvent</dfn></b>
dino@936 1075 </dt>
dino@936 1076 <dd>
dino@936 1077 <p>
dino@936 1078 The <code>TransitionEvent</code> interface provides specific contextual information associated with transitions.
dino@936 1079 </p>
dino@936 1080 <dl>
dino@936 1081 <dt>
dino@936 1082 <b>IDL Definition</b>
dino@936 1083 </dt>
dino@936 1084 <dd>
dino@936 1085 <div class='idl-code'>
dino@936 1086 <pre>
dbaron@7423 1087 <span id="TransitionEvent">[Constructor(DOMString <var title="">type</var>, optional <i>TransitionEventInit</i> <var title="">transitionEventInitDict</var>)]
dbaron@7316 1088 interface TransitionEvent</span> : Event {
dbaron@7316 1089 readonly attribute DOMString <a href="#Events-TransitionEvent-propertyName">propertyName</a>;
dbaron@7316 1090 readonly attribute float <a href="#Events-TransitionEvent-elapsedTime">elapsedTime</a>;
dbaron@7316 1091 readonly attribute DOMString <a href="#Events-TransitionEvent-pseudoElement">pseudoElement</a>;
dino@936 1092 };
dbaron@7316 1093
dbaron@7423 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> {
dbaron@8066 1095 DOMString <a href="#Events-TransitionEvent-propertyName">propertyName</a> = "";
dbaron@8066 1096 float <a href="#Events-TransitionEvent-elapsedTime">elapsedTime</a> = 0.0;
dbaron@8066 1097 DOMString <a href="#Events-TransitionEvent-pseudoElement">pseudoElement</a> = "";
dbaron@7316 1098 }
dino@936 1099 </pre>
dino@936 1100 </div>
dino@936 1101 </dd>
dino@936 1102 <dt>
dino@936 1103 <b>Attributes</b>
dino@936 1104 </dt>
dino@936 1105 <dd>
dino@936 1106 <dl>
dino@936 1107 <dt>
dbaron@7403 1108 <code class='attribute-name'><dfn title="TransitionEvent::propertyName" id="Events-TransitionEvent-propertyName">propertyName</dfn></code> of type <code>DOMString</code>, readonly
dino@936 1109 </dt>
dino@936 1110 <dd>
dino@936 1111 The name of the CSS property associated with the transition.
dino@936 1112 </dd>
dino@936 1113 </dl>
dino@936 1114 <dl>
dino@936 1115 <dt>
dbaron@7403 1116 <code class='attribute-name'><dfn title="TransitionEvent::elapsedTime" id="Events-TransitionEvent-elapsedTime">elapsedTime</dfn></code> of type <code>float</code>, readonly
dino@936 1117 </dt>
dino@936 1118 <dd>
simon@4370 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>.
dino@936 1120 </dd>
dino@936 1121 </dl>
dbaron@5259 1122 <dl>
dbaron@5259 1123 <dt>
dbaron@7403 1124 <code class='attribute-name'><dfn title="TransitionEvent::pseudoElement" id="Events-TransitionEvent-pseudoElement">pseudoElement</dfn></code> of type <code>DOMString</code>, readonly
dbaron@5259 1125 </dt>
dbaron@5259 1126 <dd>
dbaron@5259 1127 The name (beginning with two colons) of the CSS
dbaron@5259 1128 pseudo-element on which the transition occured (in
dbaron@5259 1129 which case the target of the event is that
dbaron@5259 1130 pseudo-element's corresponding element), or the empty
dbaron@5259 1131 string if the transition occurred on an element (which
dbaron@5259 1132 means the target of the event is that element).
dbaron@5259 1133 </dd>
dbaron@5259 1134 </dl>
dino@936 1135 </dd>
dino@936 1136 </dl>
dbaron@7316 1137 <p>
dbaron@7423 1138 <code id="TransitionEvent-constructor">TransitionEvent(type, transitionEventInitDict)</code>
dbaron@8064 1139 is an <a class="external" href="http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#constructing-events">event constructor</a>.
dbaron@7316 1140 </p>
dino@936 1141 </dd>
dino@936 1142 </dl>
dino@936 1143 <p>
dino@936 1144 There is one type of transition event available.
dino@936 1145 </p>
dino@936 1146 <dl>
dino@936 1147 <dt>
dbaron@7404 1148 <b><dfn>transitionend</dfn></b>
dino@936 1149 </dt>
dino@936 1150 <dd>
dbaron@7300 1151 The <code>transitionend</code> event occurs at the completion of the transition. In the
dino@1469 1152 case where a transition is removed before completion, such as if the
dino@1469 1153 transition-property is removed, then the event will not fire.
dino@936 1154 <ul>
dino@936 1155 <li>Bubbles: Yes
dino@936 1156 </li>
dino@936 1157 <li>Cancelable: Yes
dino@936 1158 </li>
dbaron@7404 1159 <li>Context Info: propertyName, elapsedTime, pseudoElement
dino@936 1160 </li>
dino@936 1161 </ul>
dino@936 1162 </dd>
dino@936 1163 </dl>
dino@936 1164
jackalmage@7183 1165 <h2 id="animatable-types"><a id="animation-of-property-types-">
dino@936 1166 Animation of property types
fantasai@5332 1167 </a></h2>
dino@936 1168
dino@936 1169 <p>
dbaron@6223 1170 When interpolating between two values,
dbaron@6223 1171 <i>V</i><sub>start</sub> and <i>V</i><sub>end</sub>,
dbaron@6223 1172 interpolation is done using the output <i>p</i> of the timing function,
dbaron@6223 1173 which gives the portion of the value space
dbaron@6223 1174 that the interpolation has crossed.
dbaron@6223 1175 Thus the result of the interpolation is
dbaron@6223 1176 <i>V</i><sub>res</sub> =
dbaron@6223 1177 (1 - <i>p</i>) &sdot; <i>V</i><sub>start</sub> +
dbaron@6223 1178 <i>p</i> &sdot; <i>V</i><sub>end</sub>.
dbaron@6223 1179 </p>
dbaron@6223 1180
dbaron@6226 1181 <p>
dbaron@6226 1182 However, if this value (<i>V</i><sub>res</sub>)
dbaron@6226 1183 is outside the allowed range of values for the property,
dbaron@6226 1184 then it is clamped to that range.
dbaron@6226 1185 This can occur if <i>p</i> is outside of the range 0 to 1,
dbaron@6226 1186 which can occur if a timing function is specified
dbaron@6226 1187 with a <i>y1</i> or <i>y2</i> that is outside the range 0 to 1.
dbaron@6226 1188 </p>
dbaron@6225 1189
dbaron@6223 1190 <p>
dino@936 1191 The following describes how each property type undergoes transition or
dino@936 1192 animation.
dino@936 1193 </p>
dino@936 1194
dino@936 1195 <ul>
dbaron@7317 1196 <li id="animtype-color">
dino@936 1197 <strong>color</strong>: interpolated via red, green, blue and alpha
dino@936 1198 components (treating each as a number, see below).
dbaron@7299 1199 The interpolation is done between premultiplied colors
dbaron@7299 1200 (that is, colors for which the red, green, and blue components
dbaron@7299 1201 specified have been multiplied by the alpha).
dino@936 1202 </li>
dbaron@7317 1203 <li id="animtype-length">
dino@936 1204 <strong>length</strong>: interpolated as real numbers.
dino@936 1205 </li>
dbaron@7317 1206 <li id="animtype-percentage">
dino@936 1207 <strong>percentage</strong>: interpolated as real numbers.
dino@936 1208 </li>
dbaron@7317 1209 <li id="animtype-lpcalc">
dbaron@7302 1210 <strong>length, percentage, or calc</strong>: when both values
dbaron@7302 1211 are lengths, interpolated as lengths; when both values are
dbaron@7302 1212 percentages, interpolated as percentages; otherwise, both
dbaron@7302 1213 values are converted into a ''calc()'' function that is the
dbaron@7302 1214 sum of a length and a percentage (each possibly zero), and
dbaron@7302 1215 these ''calc()'' functions have each half interpolated as real
dbaron@7302 1216 numbers.
dbaron@7302 1217 </li>
dbaron@7317 1218 <li id="animtype-integer">
dino@936 1219 <strong>integer</strong>: interpolated via discrete steps (whole
dino@936 1220 numbers). The interpolation happens in real number space and is
dbaron@7335 1221 converted to an integer by rounding to the nearest integer, with
dbaron@7335 1222 values halfway between a pair of integers rounded towards
dbaron@7335 1223 positive infinity.
dino@936 1224 </li>
dbaron@7317 1225 <li id="animtype-font-weight">
dbaron@5257 1226 <strong>font weight</strong>: interpolated via discrete steps
dbaron@5257 1227 (multiples of 100). The interpolation happens in real number
dbaron@5286 1228 space and is converted to an integer by rounding to the
dbaron@7335 1229 nearest multiple of 100, with values halfway between multiples
dbaron@7335 1230 of 100 rounded towards positive infinity.
dbaron@5257 1231 </li>
dbaron@7317 1232 <li id="animtype-number">
dino@936 1233 <strong>number</strong>: interpolated as real (floating point)
dino@936 1234 numbers.
dino@936 1235 </li>
dbaron@7317 1236 <li id="animtype-rect">
dino@936 1237 <strong>rectangle</strong>: interpolated via the x, y,
dino@936 1238 width and height components (treating each as a number).
dino@936 1239 </li>
dbaron@7317 1240 <li id="animtype-visibility">
dbaron@5258 1241 <strong>visibility</strong>: if one of the values is
dbaron@7300 1242 ''visible'', interpolated as a discrete step where values of the
dbaron@7300 1243 timing function between 0 and 1 map to ''visible'' and other
dbaron@5258 1244 values of the timing function (which occur only at the
dbaron@7300 1245 start/end of the transition or as a result of ''cubic-bezier()''
dbaron@5258 1246 functions with Y values outside of [0, 1]) map to the closer
dbaron@7300 1247 endpoint; if neither value is ''visible'' then not interpolable.
dino@936 1248 </li>
dbaron@7322 1249 <li id="animtype-shadow-list">
dbaron@7350 1250 <strong>shadow list</strong>: Each shadow in the list is
dbaron@7350 1251 interpolated via the
dbaron@7350 1252 color (as <a href="#animtype-color">color</a>) component,
dbaron@7350 1253 and x, y, blur, and (when appropriate) spread
dbaron@7350 1254 (as <a href="#animtype-length">length</a>) components.
dbaron@7350 1255 For each shadow, if one input shadow is ''inset'' and the other
dbaron@7350 1256 is not, then the result for that shadow matches the inputs;
dbaron@7350 1257 otherwise the entire list is not interpolable.
dbaron@7350 1258 If the lists of shadows have different lengths,
dbaron@7350 1259 then the shorter list is padded at the end
dbaron@7350 1260 with shadows whose color is ''transparent'',
dbaron@7350 1261 all lengths are ''0'',
dbaron@7350 1262 and whose ''inset'' (or not) matches the longer list.
dino@936 1263 </li>
dbaron@7317 1264 <li id="animtype-gradient">
dino@936 1265 <strong>gradient</strong>: interpolated via the
dino@936 1266 positions and colors of each stop. They must have the same type
dino@936 1267 (radial or linear) and same number of stops in order to be animated.
dbaron@2964 1268 <span class="note">Note: [[CSS3-IMAGES]] may extend this
dbaron@2964 1269 definition.</span>
dino@936 1270 </li>
dbaron@7317 1271 <li id="animtype-paintserver">
dino@936 1272 <strong>paint server</strong> (SVG): interpolation is only supported
dbaron@5319 1273 between: gradient to gradient and color to color. They then
dino@936 1274 work as above.
dino@936 1275 </li>
dbaron@7322 1276 <li id="animtype-simple-list">
dbaron@7322 1277 <strong>simple list</strong> of other types:
dbaron@7322 1278 If the lists have the same number of items,
dbaron@7322 1279 and each pair of values can be interpolated,
dbaron@7322 1280 each item in the list is interpolated using
dbaron@7322 1281 the rules given for those types.
dbaron@7322 1282 Otherwise the values are not interpolable.
dbaron@7322 1283 </li>
dbaron@7322 1284 <li id="animtype-repeatable-list">
dbaron@7322 1285 <strong>repeatable list</strong> of other types:
dbaron@7322 1286 The result list has a length that is the least common multiple
dbaron@7322 1287 of the lengths of the input lists.
dbaron@7322 1288 Each item in the result is the interpolation of the value
dbaron@7322 1289 from each input list repeated to the length of the result list.
dbaron@7322 1290 If a pair of values cannot be interpolated, then the lists
dbaron@7322 1291 are not interpolable.
dbaron@7323 1292 <span class="note">
dbaron@7323 1293 The repeatable list concept ensures that a list that is
dbaron@7323 1294 conceptually repeated to a certain length (as
dbaron@7323 1295 'background-origin' is repeated to the length of the
dbaron@7323 1296 'background-image' list) or repeated infinitely will
dbaron@7323 1297 smoothly transition between any values, and so that the
dbaron@7323 1298 computed value will properly represent the result (and
dbaron@7323 1299 potentially be inherited correctly).
dbaron@7323 1300 </span>
dino@1469 1301 </li>
dino@936 1302 </ul>
dino@936 1303
dbaron@6224 1304 <p>Future specifications may define additional types that can
dbaron@6224 1305 be animated.</p>
dbaron@6224 1306
dbaron@7320 1307 <p>See the definition of 'transition-property' for how animation
dbaron@7320 1308 of shorthand properties and the ''all'' value is applied to any
dbaron@7320 1309 properties (in the shorthand) that can be animated.</p>
dbaron@7320 1310
jackalmage@7183 1311 <h2 id="animatable-properties"><a id="animatable-properties-">
dino@936 1312 Animatable properties
fantasai@5332 1313 </a></h2>
dino@936 1314
dbaron@4128 1315 <!--
dbaron@4128 1316 As resolved in
dbaron@4128 1317 http://lists.w3.org/Archives/Public/www-style/2011Sep/0497.html
dbaron@4128 1318 -->
dbaron@7341 1319
dbaron@7341 1320 <p>The definition of each CSS property defines
dbaron@7341 1321 when the values of that property can be interpolated
dbaron@7341 1322 by referring to the definitions of property types
dbaron@7341 1323 in the <a href="#animatable-types">previous section</a>.
dbaron@7341 1324 Values are animatable when
dbaron@7341 1325 both the from and the to values of the property have the type described.
dbaron@7341 1326 (When a composite type such as "length, percentage, or calc" is listed,
dbaron@7341 1327 this means that both values must fit into that composite type.)
dbaron@7341 1328 When multiple types are listed in the form "either A or B",
dbaron@7341 1329 both values must be of the same type to be interpolable.</p>
dbaron@7341 1330
dbaron@4128 1331 <p>For properties that exist at the time this specification was
dbaron@4128 1332 developed, this specification defines whether and how they are
dbaron@4128 1333 animated. However, future CSS specifications may define
dbaron@4128 1334 additional properties, additional values for existing properties,
dbaron@4128 1335 or additional animation behavior of existing values. In order to
dbaron@4128 1336 describe new animation behaviors and to have the definition of
dbaron@4128 1337 animation behavior in a more appropriate location, future CSS
dbaron@4128 1338 specifications should include an "Animatable:" line in the summary
dbaron@4128 1339 of the property's definition (in addition to the other lines
dbaron@4128 1340 described in [[CSS21]], <a
dbaron@4128 1341 href="http://www.w3.org/TR/CSS21/about.html#property-defs">section
dbaron@4128 1342 1.4.2</a>). This line should say "no" to indicate that a property
dbaron@4128 1343 cannot be animated or should reference an animation behavior
dbaron@4128 1344 (which may be one of the behaviors in the <a
dbaron@4128 1345 href="#animation-of-property-types-">Animation of property
dbaron@4128 1346 types</a> section above, or may be a new behavior) to define how
dbaron@4128 1347 the property animates. Such definitions override those given in
dbaron@4128 1348 this specification.</p>
dbaron@4128 1349
jackalmage@7183 1350 <h3 id="animatable-css"><a id="properties-from-css-">
dino@936 1351 Properties from CSS
fantasai@5332 1352 </a></h3>
dino@936 1353
dbaron@7341 1354 <p>
dbaron@7341 1355 The following definitions define the animation behavior for
dbaron@7396 1356 properties in CSS Level 2 Revision 1 ([[CSS21]]) and in Level 3 of
dbaron@7341 1357 the CSS Color Module ([[CSS3COLOR]]).
dbaron@7341 1358 </p>
dbaron@6227 1359
simon@4394 1360 <table class="animatable-properties">
dino@936 1361 <tr>
dino@936 1362 <th>Property Name</th>
dino@936 1363 <th>Type</th>
dino@936 1364 </tr>
dino@936 1365 <tr>
dbaron@7341 1366 <td>background-color</td><td>as <a href="#animtype-color">color</a></tr>
dino@936 1367 <tr>
dbaron@7341 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>
dino@936 1369 </tr>
dino@936 1370 <tr>
dbaron@7341 1371 <td>border-bottom-color</td><td>as <a href="#animtype-color">color</a></td>
dino@936 1372 </tr>
dino@936 1373 <tr>
dbaron@7341 1374 <td>border-bottom-width</td><td>as <a href="#animtype-length">length</a></td>
dino@936 1375 </tr>
dino@936 1376 <tr>
dbaron@7341 1377 <td>border-left-color</td><td>as <a href="#animtype-color">color</a></td>
dino@936 1378 </tr>
dino@936 1379 <tr>
dbaron@7341 1380 <td>border-left-width</td><td>as <a href="#animtype-length">length</a></td>
dino@936 1381 </tr>
dino@936 1382 <tr>
dbaron@7341 1383 <td>border-right-color</td><td>as <a href="#animtype-color">color</a></td>
dino@936 1384 </tr>
dino@936 1385 <tr>
dbaron@7341 1386 <td>border-right-width</td><td>as <a href="#animtype-length">length</a></td>
dino@936 1387 </tr>
dino@936 1388 <tr>
dbaron@7341 1389 <td>border-spacing</td><td>as <a href="#animtype-simple-list">simple list</a> of <a href="#animtype-length">length</a></td>
dino@936 1390 </tr>
dino@936 1391 <tr>
dbaron@7341 1392 <td>border-top-color</td><td>as <a href="#animtype-color">color</a></td>
dino@936 1393 </tr>
dino@936 1394 <tr>
dbaron@7341 1395 <td>border-top-width</td><td>as <a href="#animtype-length">length</a></td>
dino@936 1396 </tr>
dino@936 1397 <tr>
dbaron@7341 1398 <td>bottom</td><td>as <a href="#animtype-lpcalc">length, percentage, or calc</a></td>
dino@936 1399 </tr>
dino@936 1400 <tr>
dbaron@7341 1401 <td>clip</td><td>as <a href="#animtype-rect">rectangle</a></td>
simon@1766 1402 </tr>
simon@1766 1403 <tr>
dbaron@7341 1404 <td>color</td><td>as <a href="#animtype-color">color</a></td>
dino@936 1405 </tr>
dino@936 1406 <tr>
dbaron@7348 1407 <td>font-size</td><td>as <a href="#animtype-length">length</a></td>
dino@936 1408 </tr>
dino@936 1409 <tr>
dbaron@7341 1410 <td>font-weight</td><td>as <a href="#animtype-font-weight">font weight</a></td>
dino@936 1411 </tr>
dino@936 1412 <tr>
dbaron@7341 1413 <td>height</td><td>as <a href="#animtype-lpcalc">length, percentage, or calc</a></td>
dino@936 1414 </tr>
dino@936 1415 <tr>
dbaron@7341 1416 <td>left</td><td>as <a href="#animtype-lpcalc">length, percentage, or calc</a></td>
dino@936 1417 </tr>
dino@936 1418 <tr>
dbaron@7341 1419 <td>letter-spacing</td><td>as <a href="#animtype-length">length</a></td>
dino@936 1420 </tr>
dino@936 1421 <tr>
dbaron@7348 1422 <td>line-height</td><td>as either <a href="#animtype-number">number</a> or <a href="#animtype-length">length</a></td>
dino@936 1423 </tr>
dino@936 1424 <tr>
dbaron@7341 1425 <td>margin-bottom</td><td>as <a href="#animtype-length">length</a></td>
dino@936 1426 </tr>
dino@936 1427 <tr>
dbaron@7341 1428 <td>margin-left</td><td>as <a href="#animtype-length">length</a></td>
dino@936 1429 </tr>
dino@936 1430 <tr>
dbaron@7341 1431 <td>margin-right</td><td>as <a href="#animtype-length">length</a></td>
dino@936 1432 </tr>
dino@936 1433 <tr>
dbaron@7341 1434 <td>margin-top</td><td>as <a href="#animtype-length">length</a></td>
dino@936 1435 </tr>
dino@936 1436 <tr>
dbaron@7341 1437 <td>max-height</td><td>as <a href="#animtype-lpcalc">length, percentage, or calc</a></td>
dino@936 1438 </tr>
dino@936 1439 <tr>
dbaron@7341 1440 <td>max-width</td><td>as <a href="#animtype-lpcalc">length, percentage, or calc</a></td>
dino@936 1441 </tr>
dino@936 1442 <tr>
dbaron@7341 1443 <td>min-height</td><td>as <a href="#animtype-lpcalc">length, percentage, or calc</a></td>
dino@936 1444 </tr>
dino@936 1445 <tr>
dbaron@7341 1446 <td>min-width</td><td>as <a href="#animtype-lpcalc">length, percentage, or calc</a></td>
dino@936 1447 </tr>
dino@936 1448 <tr>
dbaron@7341 1449 <td>opacity</td><td>as <a href="#animtype-number">number</a></td>
dino@936 1450 </tr>
dino@936 1451 <tr>
dbaron@7341 1452 <td>outline-color</td><td>as <a href="#animtype-color">color</a></td>
dino@936 1453 </tr>
dino@936 1454 <tr>
dbaron@7341 1455 <td>outline-width</td><td>as <a href="#animtype-length">length</a></td>
dino@936 1456 </tr>
dino@936 1457 <tr>
dbaron@7341 1458 <td>padding-bottom</td><td>as <a href="#animtype-length">length</a></td>
dino@936 1459 </tr>
dino@936 1460 <tr>
dbaron@7341 1461 <td>padding-left</td><td>as <a href="#animtype-length">length</a></td>
dino@936 1462 </tr>
dino@936 1463 <tr>
dbaron@7341 1464 <td>padding-right</td><td>as <a href="#animtype-length">length</a></td>
dino@936 1465 </tr>
dino@936 1466 <tr>
dbaron@7341 1467 <td>padding-top</td><td>as <a href="#animtype-length">length</a></td>
dino@936 1468 </tr>
dino@936 1469 <tr>
dbaron@7341 1470 <td>right</td><td>as <a href="#animtype-lpcalc">length, percentage, or calc</a></td>
dino@936 1471 </tr>
dino@936 1472 <tr>
dbaron@7341 1473 <td>text-indent</td><td>as <a href="#animtype-lpcalc">length, percentage, or calc</a></td>
dino@936 1474 </tr>
dino@936 1475 <tr>
dbaron@7341 1476 <td>text-shadow</td><td>as <a href="#animtype-shadow-list">shadow list</a></td>
dino@936 1477 </tr>
dino@936 1478 <tr>
dbaron@7341 1479 <td>top</td><td>as <a href="#animtype-lpcalc">length, percentage, or calc</a></td>
dino@936 1480 </tr>
dino@936 1481 <tr>
dbaron@7348 1482 <td>vertical-align</td><td>as <a href="#animtype-length">length</a></td>
dino@936 1483 </tr>
dino@936 1484 <tr>
dbaron@7341 1485 <td>visibility</td><td>as <a href="#animtype-visibility">visibility</a></td>
dino@936 1486 </tr>
dino@936 1487 <tr>
dbaron@7341 1488 <td>width</td><td>as <a href="#animtype-lpcalc">length, percentage, or calc</a></td>
dino@936 1489 </tr>
dino@936 1490 <tr>
dbaron@7348 1491 <td>word-spacing</td><td>as <a href="#animtype-length">length</a></td>
dino@936 1492 </tr>
dino@936 1493 <tr>
dbaron@7341 1494 <td>z-index</td><td>as <a href="#animtype-integer">integer</a></td>
dino@936 1495 </tr>
dino@936 1496 </table>
dino@936 1497
jackalmage@7183 1498 <h3 id="animatable-svg"><a id="properties-from-svg-">
dino@936 1499 Properties from SVG
fantasai@5332 1500 </a></h3>
dino@936 1501
dino@1469 1502 <p>
dino@1469 1503 All properties defined as animatable in the SVG specification, provided
dino@1469 1504 they are one of the property types listed above.
dino@1469 1505 </p>
dino@1469 1506
dino@1469 1507 <!-- <table>
dino@936 1508 <tr>
dino@936 1509 <th>Property Name</th><th>Type</th>
dino@936 1510 </tr>
dino@936 1511 <tr>
dbaron@7341 1512 <td>stop-color</td><td>as <a href="#animtype-color">color</a></td>
dino@936 1513 </tr>
dino@936 1514 <tr>
dbaron@7341 1515 <td>stop-opacity</td><td>as <a href="#animtype-number">number</a></td>
dino@936 1516 </tr>
dino@936 1517 <tr>
dbaron@7341 1518 <td>fill</td><td>as <a href="#animtype-paintserver">paint server</a></td>
dino@936 1519 </tr>
dino@936 1520 <tr>
dbaron@7341 1521 <td>fill-opacity</td><td>as <a href="#animtype-number">number</a></td>
dino@936 1522 </tr>
dino@936 1523 <tr>
dbaron@7341 1524 <td>stroke</td><td>as <a href="#animtype-paintserver">paint server</a></td>
dino@936 1525 </tr>
dino@936 1526 <tr>
dbaron@7341 1527 <td>stroke-dasharray</td><td>as <a href="#animtype-repeatable-list">repeatable list</a> of <a href="#animtype-number">number</a></td>
dino@936 1528 </tr>
dino@936 1529 <tr>
dbaron@7341 1530 <td>stroke-dashoffset</td><td>as <a href="#animtype-number">number</a></td>
dino@936 1531 </tr>
dino@936 1532 <tr>
dbaron@7341 1533 <td>stroke-miterlimit</td><td>as <a href="#animtype-number">number</a></td>
dino@936 1534 </tr>
dino@936 1535 <tr>
dbaron@7341 1536 <td>stroke-opacity</td><td>as <a href="#animtype-number">number</a></td>
dino@936 1537 </tr>
dino@936 1538 <tr>
dbaron@7341 1539 <td>stroke-width</td><td>as <a href="#animtype-number">number</a></td>
dino@936 1540 </tr>
dino@936 1541 <tr>
dbaron@7341 1542 <td>viewport-fill</td><td>as <a href="#animtype-color">color</a></td>
dino@936 1543 </tr>
dino@936 1544 <tr>
dbaron@7341 1545 <td>viewport-fill-opacity</td><td>as <a href="#animtype-color">color</a></td>
dino@936 1546 </tr>
dino@1469 1547 </table> -->
dino@936 1548
dbaron@9050 1549 <h2 id="changes">Changes since Working Draft of 12 February 2013</h2>
dbaron@9050 1550
dbaron@9050 1551 <p>The following are the substantive changes made since the
dbaron@9050 1552 <a href="http://www.w3.org/TR/2013/WD-css3-transitions-20130212/">Working Draft
dbaron@9050 1553 dated 12 February 2013</a>:</p>
dbaron@9050 1554
dbaron@9050 1555 <ul>
dbaron@9050 1556 <li>Fixed missed substitution (<span>TransitionEventInit</span> rather than AnimationEventInit) when copying event IDL from css3-animations.
dbaron@9050 1557 <li>Make naming of event constructor dictionary parameters more consistent with DOM-Level-3-Events.
dbaron@9050 1558 <li>Make the behavior of simultaneous changes of 'transition-*' properties and transitionable properties even clearer.
dbaron@9050 1559 <li>Computed Value line for shorthands should say "see individual properties".
dbaron@9050 1560 <li>Define initial values of event properties, using initializers in <span>TransitionEventInit</span>.
dbaron@9050 1561 </ul>
dbaron@9050 1562
dbaron@9050 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>.
dbaron@9050 1564
dbaron@9050 1565 <p>For changes in previous working drafts, see
dbaron@9050 1566 <a href="http://www.w3.org/TR/2013/WD-css3-transitions-20130212/ChangeLog">the ChangeLog</a>, and the above version control logs.</p>
dbaron@9050 1567
dbaron@5312 1568 <h2 id="acknowledgments">Acknowledgments</h2>
dbaron@5312 1569
dbaron@5312 1570 <p>Thanks especially to the feedback from
dbaron@5312 1571 Tab Atkins,
dbaron@6736 1572 Carine Bournez,
dbaron@5316 1573 Aryeh Gregor,
dbaron@5316 1574 Vincent Hardy,
dbaron@8066 1575 Anne van Kesteren,
dbaron@5316 1576 Cameron McCormack,
dbaron@5316 1577 Alex Mogilevsky,
dbaron@5312 1578 and all the rest of the
dbaron@5312 1579 <a href="http://lists.w3.org/Archives/Public/www-style/">www-style</a> community.</p>
dino@936 1580
dbaron@5334 1581 <h2 id="references">References</h2>
dino@936 1582
jackalmage@7183 1583 <h3 class="no-num" id="normative-references">Normative references</h3>
dino@936 1584 <!--normative-->
dino@936 1585
jackalmage@7183 1586 <h3 class="no-num" id="other-references">Other references</h3>
dino@936 1587 <!--informative-->
dino@936 1588
dino@936 1589
dino@936 1590
jackalmage@7183 1591 <h2 class="no-num" id="property-index">Property index</h2>
dino@936 1592 <!-- properties -->
dino@936 1593
dino@936 1594
dino@936 1595
dino@936 1596 <h2 class="no-num" id="index">Index</h2>
dino@936 1597 <!--index-->
dino@936 1598
dino@936 1599 </body>
dino@936 1600 </html>
dino@936 1601 <!-- Keep this comment at the end of the file
dino@936 1602 Local variables:
dino@936 1603 mode: sgml
dino@936 1604 sgml-default-doctype-name:"html"
dino@936 1605 sgml-minimize-attributes:t
dino@936 1606 End:
dino@936 1607 -->

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