I think we should match the syntax of 'transition-property':
http://dev.w3.org/csswg/css-transitions/#transition-property-property
This means that any list of comma-separated IDENTs is accepted as a valid
value. This is important since it means if the list contains property names
the UA currently doesn't support, the value is still valid and the UA can
still optimize for the property names it does support.
Rob
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