feat(core): add scrollMargin to @defer viewport options - #70187
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Allow `scrollMargin` to be configured for `@defer` viewport, prefetch, and hydrate triggers. Unlike `rootMargin`, `scrollMargin` expands the clipping bounds of nested scroll containers. This allows deferred content to be loaded or prefetched before it enters the visible area of a nested scroller. Include `scrollMargin` in the IntersectionObserver cache key so viewport triggers with different margins use the correct observer configuration.
SkyZeroZx
marked this pull request as ready for review
August 13, 2026 21:57
SkyZeroZx
marked this pull request as draft
August 13, 2026 21:58
SkyZeroZx
marked this pull request as ready for review
August 13, 2026 21:58
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Allow
scrollMarginto be configured for@deferviewport, prefetch, and hydrate triggers.Unlike
rootMargin,scrollMarginexpands the clipping bounds of nested scroll containers. This allows deferred content to be loaded or prefetched before it enters the visible area of a nested scroller.Include
scrollMarginin the IntersectionObserver cache key so viewport triggers with different margins use the correct observer configuration.