FrontendHaltPerformance·Intermediate·Conceptual·1 min read
What does Interaction to Next Paint measure?
Short interview answer
The time from a user interaction (click, tap, key press) to the next frame the browser paints reflecting that interaction. It captures input delay before the handler runs, the handler's own processing time, and the presentation delay to render the resulting frame.
Key takeaway
Explain the underlying mental model clearly, then support it with a concrete example and its trade-offs.