Andreas Kling 5e5dbae218 Tests: Add IntersectionObserver tests for explicit element root ...

Add tests verifying behavior when an IntersectionObserver has an
explicit element root:

- A target that is a descendant of the root should be reported as
  intersecting when it overlaps the root.
- A target that is NOT a descendant of the root but spatially overlaps
  it should NOT be reported as intersecting per spec step 3 of "run
  the update intersection observations steps". The expected output
  currently reflects the wrong (buggy) behavior.

2026-03-22 14:09:22 -05:00

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