Replace assert_precondition with assert_implements in event-timing/ assert_precondition is deprecated (see https://github.com/web-platform-tests/rfcs/blob/master/rfcs/assert_precondition_rename.md). Since PerformanceElementTiming is not an OPTIONAL part of the Element Timing spec and EventCount is not an OPTIONAL part of the Event Timing spec, these tests should use assert_implements.
diff --git a/event-timing/crossiframe.html b/event-timing/crossiframe.html index 55e2bec..7114086 100644 --- a/event-timing/crossiframe.html +++ b/event-timing/crossiframe.html
@@ -48,7 +48,7 @@ } promise_test(async t => { - assert_precondition(window.PerformanceEventTiming, "Event Timing is not supported"); + assert_implements(window.PerformanceEventTiming, "Event Timing is not supported"); clickTimeMin = performance.now(); let observedEntries = false; const observerPromise = new Promise(resolve => { 