Boris Chiou b34f4349a7 Bug 1737918 - Part 1: Add scroll() to animation-timeline for style system. r=emilio
scroll() is defined in the spec proposal, and there is a temporary spec:
https://drafts.csswg.org/scroll-animations-1/rewrite#scroll-notation.

The spec is still under development, so we don't drop the orignal
scroll-timeline at rule. Instead, we add a new scroll() notation to
animation-timeline, and support both syntax for now.

Differential Revision: https://phabricator.services.mozilla.com/D143417
2022-04-21 17:05:17 +00:00
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