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This now needs a rebase :) |
…tart The loadstart event has no ordering guarantee relative to the window load event. Intersection observer callbacks can fire before or after the load event, and media elements use their own task source, so loadstart may be dispatched before window load. The trickle(d2) pipe ensures slow media delivery, so checking loadeddata (which fires after enough data arrives to render the first frame) reliably verifies that window onload is not blocked by lazy media elements.
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@zcorpan rebased! Thanks |
zcorpan
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Mar 23, 2026
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The loadstart event has no ordering guarantee relative to the window load event. Intersection observer callbacks can fire before or after the load event, and media elements use their own task source, so loadstart may be dispatched before window load.
The trickle(d2) pipe ensures slow media delivery, so checking loadeddata (which fires after enough data arrives to render the first frame) reliably verifies that window onload is not blocked by lazy media elements.