GitHub(@github):What we shipped is a recurring measurement pass, gated on idle and scoped to roughly 2400px around the viewport. Mounted blocks are ground truth. Observers normally only flag a block for the pass. They don’t write heights themselves. There’s one exception: a visible block resizing because of the user’s action can apply one synchronous correction before paint. That keeps the comment and code below it moving together without reopening the feedback loop.

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2026.10.12 18:06

What we shipped is a recurring measurement pass, gated on idle and scoped to roughly 2400px around the viewport. Mounted blocks are ground truth. Observers normally only flag a block for the pass. They don’t write heights themselves. There’s one exception: a visible block resizing because of the user’s action can apply one synchronous correction before paint. That keeps the comment and code below it moving together without reopening the feedback loop.