58140 2011-04-08 06:25:51 -0700 Support transitions to and from 'auto' values of left, top, width, height, etc. 2012-01-04 19:54:49 -0800 1 1 1 Unclassified WebKit CSS 528+ (Nightly build) PC OS X 10.5 RESOLVED FIXED P2 Normal --- 0 mail webkit-unassigned davidbarr david.b.calhoun shanestephens oldest_to_newest 382195 0 mail 2011-04-08 06:25:51 -0700 Please support transitions to auto values. Like a transition from height: 0; to height: auto; I attached such a non-yet-working example. See also Mozilla's Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=571344 Thanks. 477206 1 david.b.calhoun 2011-10-03 13:41:29 -0700 The way this works now seems like a bug. Current behavior: A transition from a specific height to height:auto will result in the element animating to height:0 and only then jumping down immediately to height:auto. Expected behavior: A transition from a specific height to height:auto should result in a smooth transition to the value calculated by height:auto. The height:auto calculation shouldn't occur after the transition. 482990 2 davidbarr 2011-10-12 21:07:48 -0700 Tested with WebKit nightly (r97312) and test suite, http://louisremi.github.com/jquery.transition.js/transition%20bugs/index.html The 5th test, which corresponds to this bug report: "When... ...the initial value of an animated property is 'auto' I expect the property to be animated properly." passed, so this bug is resolved at or before r97312. 529967 3 shanestephens 2012-01-04 19:54:49 -0800 Marking this as resolved. Although the current behaviour may not seem ideal, the specification (http://dev.w3.org/csswg/css3-transitions/) doesn't deal with what happens when animating to/from auto at all. It's better to discuss this issue on www-style@w3.org and wait for a specified behaviour to exist than to debate in this bug.