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feat(cwv): no tracking on Safari, polyfill needed #690

Closed kptdobe closed 3 years ago

kptdobe commented 3 years ago

No tracking data are sent from Safari: the polyfill is needed to track the FID, other metrics cannot be tracked (yet).

kptdobe commented 3 years ago

The doc states:

there are a few good reasons to consider using the "base+polyfill" version, for example:

  • FID can be measured in all browsers.
  • CLS, FCP, FID, and LCP will be more accurate in some cases (since the polyfill detects the page's initial visibilityState earlier).

So apparently, it is worth using it everywhere.

kptdobe commented 3 years ago

Declined by @davidnuescheler: we should not change the head.html.