From a triage[1] of currently failing WPT resource-timing tests[2], the following WebKit test failures may (or may not be) be related to non-200 status code validations: https://wpt.fyi/results/resource-timing/status-codes-create-entry.html?label=master&label=experimental&aligned https://wpt.fyi/results/resource-timing/object-not-found-adds-entry.html?label=master&label=experimental&aligned [1] https://github.com/w3c/resource-timing/issues/233 [2] https://wpt.fyi/results/resource-timing?label=master&label=experimental&aligned
<rdar://problem/69369003>