[csswg-drafts] [scroll-animations] Elements returned from selector() should be live (#5289)

andruud has just created a new issue for https://github.com/w3c/csswg-drafts:

== [scroll-animations] Elements returned from selector() should be live ==
It's possible for the `source` of a `@scroll-timeline` to change its meaning between frames. E.g. for `source:selector(#foo)`, which element is identified by `#foo` can change if attributes are moved around or elements are added/removed. When this happens, the subsequent frame / updating-of-the-scroll-timeline-state should then reflect whatever the new DOM state is.

This applies to element-based offsets as well.

cc @majido 


Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/5289 using your GitHub account