https://csser.space/questions/validation-with-javascript-can-trigger-the-display-of-a-hidden-element#

The PerformanceNavigationTiming interface provides metrics regarding the browser's document navigation events

Process Unload Event

Event	Timing (ms)
unloadEventStart	0
unloadEventEnd	0

Redirect

Event	Timing (ms)
redirectStart	0
redirectEnd	0

Service Worker Init

Event	Timing (ms)
workerStart	0

Service Worker Fetch Event

Event	Timing (ms)
fetchStart	4

DNS

Event	Timing (ms)
domainLookupStart	4
domainLookupEnd	4

TCP

Request

Event	Timing (ms)
requestStart	94

Response

Event	Timing (ms)
responseStart	304
responseEnd	308

Processing

Event	Timing (ms)
domInteractive	480
domContentLoadedEventStart	481
domContentLoadedEventEnd	486
domComplete	908

Load

Event	Timing (ms)
loadEventStart	908
loadEventEnd	909