Test query
({a: window.PerformanceObserver.supportedEntryTypes, b: window.PerformancePaintTiming, c: navigator.userAgent})
A TP blog says shipped in TP75 which would mean 12.1 stable but I tested in 12.1 and it's not true. It returns undefined. So I asssume 13.0 (I don't have 13.0 to test).
Also I always get empty array on iOS, but maybe it'a an issue with BrowserStack.
12.1 undefined
13.0-14.0 ["mark", "measure", "resource"]
73: https://www.chromestatus.com/feature/6737857909620736
77: https://www.chromestatus.com/feature/5149663191629824 but I observed firstInput in 76
85: https://www.chromestatus.com/feature/5167290693713920
73: 6 ["longtask", "mark", "measure", "navigation", "paint", "resource"]
76: 7 ["firstInput", "longtask", "mark", "measure", "navigation", "paint", "resource"]
78-84: 10 ["element", "first-input", "largest-contentful-paint", "layout-shift", "longtask", "mark", "measure", "navigation", "paint", "resource"]
85-89: 11 ["element", "event", "first-input", "largest-contentful-paint", "layout-shift", "longtask", "mark", "measure", "navigation", "paint", "resource"]
this bug says 66 but it's not true (maybe was behind the flag) https://bugzilla.mozilla.org/show_bug.cgi?id=1512225
67 no support for API `PerformanceObserver.supportedEntryTypes`
68-83 [ "mark", "measure", "navigation", "resource" ]
84-86 [ "mark", "measure", "navigation", "paint", "resource" ]