testing/web-platform/tests/element-timing/element-only-when-fully-active.html

   1 <!DOCTYPE HTML>
   2 <meta charset=utf-8>
   3 <title>ElementTiming: element is only exposed for fully active documents.</title>
   4 <body>
   5 <script src="/resources/testharness.js"></script>
   6 <script src="/resources/testharnessreport.js"></script>
   7 <iframe src="resources/iframe-stores-entry.html" id="ifr"></iframe>
   8 <script>
   9   let t = async_test('Only expose element attribute for fully active documents');
  10   t.step(() => {
  11     assert_precondition(window.PerformanceElementTiming, "PerformanceElementTiming is not implemented");
  12   });
  13   window.triggerTest = t.step_func_done(elementEntry => {
  14     assert_not_equals(elementEntry.element, null);
  15     const iframe = document.getElementById('ifr');
  16     iframe.remove();
  17     assert_equals(elementEntry.element, null);
  18   });
  19 </script>
  20 </body>