- From: L. David Baron <dbaron@dbaron.org>
- Date: Fri, 26 Jun 2009 16:44:14 -0700
- To: www-style@w3.org
I have another question about transitions that I think ought to be addressed in the spec ( http://dev.w3.org/csswg/css3-transitions/ ), though in this case I'm not exactly sure how it should be addressed in the spec. This is the question of whether transition should be associated with a change in style on a content node, or a change in style on a rendering object (a box). Either solution poses a bunch of problems. If transitions are associated with the style on an element (DOM node), then we have problems in any case where a content node has more than one style. The main case of this I can think of is pseudo-elements. For example, I think it's hard to do something sensible with: p { color: gray; } p::first-line { color: black; } p:hover { color: blue; } p:hover::first-line { color: aqua; } a { transition: 3s color; } then it's really not clear what the transition on the anchor should be when the p goes into the :hover state (either when the anchor is split between the first line and the second, or when the anchor is entirely in the first line). On the other hand, if transitions are associated with the style on a rendering object, you end up with transitions not occurring when there's also a change in 'display' or some other property that changes what rendering objects are present. I think the specification should define more precisely how transitions interact with pseudo-elements and when they should occur so that this distinction is clear. -David -- L. David Baron http://dbaron.org/ Mozilla Corporation http://www.mozilla.com/
Received on Friday, 26 June 2009 23:44:50 UTC