Intent to Prototype: Layout Instability Shifted Element Surfacing
Steve Kobes
Contact emails
Explainer
https://github.com/WICG/layout-instability/blob/master/sources.md
Design doc/Spec
https://github.com/WICG/layout-instability/pull/32
Summary
Extends the LayoutShift interface with information about the specific DOM element(s) that experienced the shift.
Motivation
This will help developers understand the causes of high CLS scores.
Risks
Interoperability and Compatibility
No significant compat risk. This feature adds a new attribute to an existing interface.
Edge: no signals
Firefox: no signals
Safari: no signals
Web / Framework developers: public support
Ergonomics
No perceived risks.
Activation
No perceived risks.
Debuggability
In addition to the API change, we intend to show shifted elements in the DevTools Performance timeline to assist lab debugging of CLS.
Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, Chrome OS, Android, and Android WebView)?
Yes.
Link to entry on the feature dashboard
No entry (small change).
Requesting approval to ship?
No
Mathias Bynens
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Joe Medley
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Steve Kobes
Do you have a tracking bug for this?