dom/events/Event-timing-safe-resolution test makes faulty assumptions

[pshaughn]

This test tries to determine resolution by converting timestamps to integer microseconds, then takes the GCD of those integer values. However, if the real resolution is something other than an integer microseconds value, for example 1/128 millisecond, the GCD of these values is 1 and it fails, even though the resolution is greater than the required 5 microsecond minimum.

[foolip]

@pshaughn have you had this test fail on some browser?

https://wpt.fyi/results/dom/events/Event-timestamp-safe-resolution.html?label=experimental&label=master&aligned shows it passing in the browsers we test for wpt.fyi.

[pshaughn]

It happened in CI of a Servo pull request, and then I changed the Servo code to use a resolution the test wouldn't be confused by since that was the path of least resistance.

[foolip]

I see, thanks! Fixing this test should be possible from the description, but without an implementation affected by it it'll be hard to do so with confidence.