FrontendHaltPerformance·Advanced·Conceptual·1 min read
What is presentation delay in the INP breakdown?
Short interview answer
After the handler runs, the browser still has to run style, layout, paint, and compositing to show the result. A handler that triggers a huge synchronous re-render or a layout of the whole page inflates this phase even if the handler's own logic was fast.
Key takeaway
Explain the underlying mental model clearly, then support it with a concrete example and its trade-offs.