content-visibility Is Not Free
Skipping off-screen rendering can help long pages, but an inaccurate intrinsic size still makes the scrollbar jump.
Topic
Browser
5 entries connected by this thread.
Tasks, Microtasks, and the Rendering Gap
A small ordering rule explains why a resolved promise can still postpone painting and user input.
Profiling a Slow Interaction
A recorded debugging session that follows one delayed click from an input event to the long task responsible for it.
What "Non-Blocking JavaScript" Actually Means
JavaScript can start asynchronous work without making the single main thread magically perform two tasks at once.
The Main Thread Is a Queueing Problem
A practical model for understanding why browser work feels instant until one task holds the main thread for too long.