internal-resources-not-counted.html

<!DOCTYPE html>
<meta charset="utf-8" />
<title>Resource Timing should not include internal resources</title>
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<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
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<p>This test validates that image resources which are part of an element's
UA-defined interface are not exposed to the performance timeline. This uses an
&lt;audio&gt; element as an example of an element with internal resources used
for the playback controls, and verifies that resource timing entries are not
created.
</p>

<!-- This element will render with internal resources for playback controls -->
<audio controls></audio>

<script>
  async_test(t => {
  const observer = new PerformanceObserver(t.step_func_done(events => {
    events.getEntries().forEach(entry => {
      assert_true(entry.initiatorType == "script" || entry.initiatorType == "img",
      "Resources loaded from this test should have initiatorType 'script' or 'img', but \"" +
          entry.name + "\" has '" + entry.initiatorType + "'.");
    });
  }));

  // Wait for one more resource to load before attaching listener, and then get
  // buffered entries.
  const image = document.createElement("img");
  image.src = "resources/blue.png";
  image.addEventListener("load", t.step_func(ev => {
    observer.observe({type: "resource", buffered: true});
  }));
  document.body.appendChild(image);

  }, "Resource timing should not include internal resources.");
</script>
chromium/third_party/blink/web_tests/external/wpt/resource-timing/internal-resources-not-counted.html
