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chromium/third_party/blink/web_tests/fast/events/hr-timestamp/context-menu-event.html 

<!DOCTYPE html>

<script src="../../../resources/testharness.js"></script>
<script src="../../../resources/testharnessreport.js"></script>
<script type="text/javascript">
async_test(function(t) {
  document.addEventListener('contextmenu', t.step_func(function(e) {
      const platformTimestamp = eventSender.lastEventTimestamp(); // in seconds
      const expectedUnclampedTimestamp = internals.monotonicTimeToZeroBasedDocumentTime(platformTimestamp) * 1000; // in milliseconds
      // Time clamping logic in Blink can introduce at most 2*100us of
      // difference. Use 0.200001 instead of 0.2 to deal with floating
      // point comparison issues.
      assert_approx_equals(e.timeStamp, expectedUnclampedTimestamp, 0.200001);
      t.done();
  }));
  eventSender.contextClick();
}, "ContextMenu event timestamp should be equal to the timestamp provided by the platform");
</script>