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Explainer
Summary
A web performance API that allows the developer to monitor the degree to which DOM elements have changed their on-screen position ("layout jank") during the user's session.
Motivation
Many websites suffer from "layout jank" - DOM elements shifting around due to content loading asynchronously. By measuring and reporting the severity of layout jank, we can give developers greater insight into the quality of the user experience.
Risks
Debuggability
No changes in DevTools are required for this feature. However we are exploring the possibility of a rendering mode in Chrome that highlights layout jank regions as they occur, similar to the way --show-paint-rects highlights paint invalidations. It might be useful to integrate this into DevTools in the future.
Will this feature be supported on all six Blink platforms?
Yes
Link to entry on the feature dashboard
Requesting approval to ship?
No