Answer
Browser must attach listeners, validate markup, and resolve mismatches on the main thread.
Quick Answer
Hydration must attach event handlers to every interactive DOM node and run all components' initialization logic client-side — for a large SPA, this means executing a large JS bundle and running React reconciliation over the entire component tree. Progressive/selective hydration (React 18) helps by hydrating in priority order rather than all at once.
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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