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Switch most preload tests to PerformanceObserver instead of a timer #9135

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yoavweiss commented Jan 23, 2018

Currently many preload tests are slow due to their use of a timer. PerformanceObserver enables us to avoid that in most cases, by giving us a notification when resources were downloaded, independent from their load events.
This PR switches most of the preload tests to use that method. (Failed to switch all, as we don't have a notification when resources failed to load, nor guarantees regarding PerfObserver firing with regard to the resource's load event)

@wpt-pr-bot wpt-pr-bot requested a review from snuggs Jan 23, 2018


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w3c-bots commented Jan 23, 2018


Started: 2018-01-30 14:26:29
Finished: 2018-01-30 14:47:53

Failing Jobs

  • firefox:nightly
  • MicrosoftEdge:14.14393
  • safari:11.0

Unstable Results

Browser: "Safari 11.0" (failures allowed)

View in: WPT PR Status | TravisCI

Test Subtest Results Messages
/preload/preload-with-type.html   TIMEOUT: 1
OK: 9
  Makes sure that preloaded resources with a type attribute trigger the onload event FAIL: 9
assert_true: Preload not supported expected true got false
/preload/single-download-preload.html   TIMEOUT: 1
OK: 9
  Makes sure that preloaded resources are not downloaded again when used FAIL: 9
promise_test: Unhandled rejection with value: "Unsupported APIs"
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