Aliaksandr Kalenik 730b28f4dc LibWeb: Add tests for stacking context invalidation ...

This test verifies that stacking contexts are correctly created and
removed when CSS properties that affect stacking context are changed:
- opacity: transitioning to/from 1
- transform: transitioning to/from none
- filter: transitioning to/from none
- isolation: transitioning to/from isolate

It also verifies that changes within the "creating" range (e.g., opacity
0.5 -> 0.3, or transform translateX(10px) -> translateX(20px)) correctly
preserve the stacking context.

2026-01-28 18:05:41 +01:00

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