[scroll-animations] Update scroll timeline css syntax and properties (#4338, #4336) #4751
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Make improvements to CSS syntax based on previous CSSWG discussions.
New at-rule
This addresses issue #4338 .
Introduce @timeline at-rule. The rule is used to specify parameters for scroll timeline (but can later
be used for regular timelines as well).
The animation-timeline property would select the appropriate at-rule based on its name.
I have also added language to allow existing
animation-nameproperty to be used for this as well. This will improve ergonomics IMO. But I can drop this part and have it as a separate PR if there is concern.Shorter names for Scroll Timeline properties
This addresses #4336
Use shorter names for properties:
Other changes
Minor changes to avoid bikeshed WARNING: