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[css3-animations] can inserting a @keyframes rule start an animation?

From: Ralph Thomas <ralpht@gmail.com>
Date: Mon, 7 Oct 2013 16:24:22 -0700
Message-ID: <CAAYQYDR3SncV5_khntjsCxLGGwEJn_kzqZ6kqOC7t0TWd=a=8Q@mail.gmail.com>
To: www-style@w3.org
Hi www-style,

  I recently added an optimization to WebKit to not perform a full
style recalc when inserting a @keyframes rule[1], which raised the
question from Simon Fraser:

"If an element has: -webkit-animation-name: foo and you insert
@-webkit-keyframes foo {...}, does the animation start?"

WebKit does not start an animation in this case (and didn't prior to
my change), but Firefox does. The CSS 3 Animations spec doesn't
directly address the issue, but does say:

"If the name does not match any keyframe at-rule, there are no
properties to be animated and the animation will not execute."

So which is the correct behavior, and can we amend the spec to make
this explicit?


[1]: https://bugs.webkit.org/show_bug.cgi?id=119479
Received on Monday, 7 October 2013 23:24:51 UTC

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