Comments (1)
This intentionally for LCP and CLS but should not be the case for FID.
LCP is not "finalised" until there is either an interaction or a the page is navigated away from (when a page is hidden we also emit the LCP event as sometimes people come back so it's more a proxy for navigating way, rather than ideal). This is because the page might still be loading and another, later, bigger LCP element could still be drawn.
Your options are either to enable reportAllChanges
- but then multiple LCP events may be reported, or you can simulate a click to finalise the LCP, or you can create (or emulate) a visibility change. You can see we use all three in our test cases: https://github.com/GoogleChrome/web-vitals/blob/main/test/e2e/onLCP-test.js
CLS is a similar situation, except click does not finalize CLS so that's not the an option for you. We have a stubVisibilityChange
function to emulate a visibility change and finalise the CLS, and again you can see this in our test suite: https://github.com/GoogleChrome/web-vitals/blob/main/test/e2e/onCLS-test.js
FID should be emitted as soon as the first interaction happens. But a FID of 0 is not emitted if there are no interactions. So you must emulate a click (or some other interaction) for it to emit.
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Related Issues (20)
- Capturing metadata with events HOT 2
- Allow to reset the INP calculation HOT 2
- v4 giving undefined TypeError HOT 1
- INP: Probably a bad measurement metric for web vitals - even with simple HTML structure pages with no CSS will cause bad value. HOT 1
- Expose INP target element as first class citizen in attribution HOT 3
- Expose ability to reset internal state of metrics (specifically INP) HOT 2
- v4 INP attribution ending processingEnd time in the wrong animation frame HOT 8
- CDN JS - Web server is returning an unknown error HOT 4
- CLS and INP are being calculated incorrectly HOT 2
- Suggestion to track all attributions HOT 4
- CLS being reported due to filter CSS transition HOT 3
- Firefox e2e tests flakey HOT 3
- can't find ReportCallback or ReportHandler type HOT 3
- Are there any updates for soft-navs? HOT 2
- LoAF missed for some INP events HOT 9
- Facing issue while exporting `web-vitals/attribution` using `browserify` HOT 2
- LoAF Performance entry script sourceFunctionName and sourceURL logged values HOT 4
- Using `performance.eventCounts` instead of `performance.interactionCount` HOT 2
- Heads Up on Changes to INP Measurement When Interfered with JS Modal Dialogs HOT 9
- TypeError: Cannot read properties of undefined (reading 'processingEnd') HOT 13
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