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WICG / layout-instability

A proposal for a Layout Instability specification
https://wicg.github.io/layout-instability/
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CumulativeLayoutShift as WPT custom metric empty #100

Closed e-orlov closed 3 years ago

e-orlov commented 3 years ago

Did exactly as in https://dev.to/chromiumdev/measuring-cumulative-layout-shift-cls-in-webpagetest-5cle: set command-line flag, script as custom metric, Dulles, VA, Canary.

In opposite as in your test, i haven't on the right a link "custom metrics". If i manipulate your URL to custom metrics with my test ID i get displayed the same screen "Custom Metrics", where, however, the line with "CumulativeLayoutShift " on the left is empty. Looking into raw JSON i see "CumulativeLayoutShift": null,.

Is this feature no longer supported by WPT? Or do i do something wrong because of any WPT change i don't know about?

yoavweiss commented 3 years ago

Hey @e-orlov!

Your question is not really related to this spec. You may want to ask it on WebPageTest's support forums. I'm closing this as this is not actionable from a spec-perspective