CumulativeLayoutShift as WPT custom metric empty
e-orlov opened this issue · comments
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?
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