Answer
Hydration bubbles hydrate children first, then expand upward, enabling selective interactivity.
Quick Answer
Hydration bubbles are the units of progressive hydration — each Suspense boundary is a bubble that hydrates independently. React attaches event listeners to the document root before hydration completes (delegation). When a user interacts with an unhydrated bubble, React synchronously hydrates just that bubble and replays the event.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ