[scroll-animations-1] Removed fill from ScrollTimeline

[JTensai]

Removed fill from ScrollTimeline in favor of returning Infinity values for before start and after end states of the timeline.

Also fixed edit link by correcting shortname.

Related Issues:
#2066 (Discussion for change)
#4347 (Solved by this change)

[majido]

BTW I think the examples need to be updated to have the animation use correct fill values.

I think they were previously broken as well. For example take the example "Scrollable picture-story show" where two balls are colliding. We expect that past end of scroll timeline (350px) the effect stays the same. This meant previously for timeline to have fill: forwards which it didn't. But now the #union-circle animation should have 'fill:forwards' .

Please review the examples and make sure they have the correct fill value.

https://drafts.csswg.org/scroll-animations-1/#scrollable-animation-usecase

[birtles]

I've commented a number of times in #2066 that I'd prefer we avoid infinity values and instead use explicit states for this.

[JTensai]

I have changed the returned values to 0 and time range since I believe we have settled on that at this point. I also updated the examples as requested.

[birtles]

I have changed the returned values to 0 and time range since I believe we have settled on that at this point.

Thank you!