GitHub(@github):For the first design, we gave every dynamic block a ResizeObserver that wrote measured heights back into the layout. We built it, then rejected it. An observer that writes a height back into the layout it’s watching can retrigger itself, and the cost grows with every mounted block.

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2026.10.12 18:06

For the first design, we gave every dynamic block a ResizeObserver that wrote measured heights back into the layout. We built it, then rejected it. An observer that writes a height back into the layout it’s watching can retrigger itself, and the cost grows with every mounted block.