What type of issue is this?

Incorrect support data (example: BrowserX says "86" but support was added in "40")

What information was incorrect, unhelpful, or incomplete?

The information claims that Safari 11 added full support for PerformanceObserver. Safari 11 and 12 had partial support. Safari 13 has full support. Safari 11 and 12 did not support the "type" option.

What browsers does this problem apply to, if applicable?

Safari

What did you expect to see?

Safari 13 has full support for PerformanceObserver. Safari 11/12 has partial support.

Did you test this? If so, how?

I had relied on MDN information when deploying a feature to production, and received a significant error rate from Safari 11/12 customers. This information is verified in https://bugs.webkit.org/show_bug.cgi?id=209216.

Can you link to any release notes, bugs, pull requests, or MDN pages related to this?

https://bugs.webkit.org/show_bug.cgi?id=209216

Do you have anything more you want to share?

No response

MDN URL

https://developer.mozilla.org/en-US/docs/Web/API/PerformanceObserver/observe

MDN metadata