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a0dc0c61f4
When invalidate_owners() runs on a stylesheet scoped to a shadow root, we previously dirtied the host and its light-DOM side too broadly. That forced restyles on nodes the shadow-scoped stylesheet cannot match. Inspect the sheet's effective selectors and dependent features up front. Only dirty assigned nodes, the host, the host root, or host-side animation consumers when the sheet can actually reach them, while keeping purely shadow-local mutations inside the shadow tree.