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chromium/third_party/blink/web_tests/external/wpt/fenced-frame/multiple-component-ads.https.html 

<!DOCTYPE html>
<title>Test loading multiple component ads</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/utils.js"></script>
<script src="/common/dispatcher/dispatcher.js"></script>
<script src="resources/utils.js"></script>

<body>
<script>
promise_test(async(t) => {
  const fencedframe = await attachFencedFrameContext({
    generator_api: 'fledge',
    num_components: 2,
  });

  await fencedframe.execute(async () => {
    const ad_component_1 = await attachComponentFencedFrameContext(0);
    const ad_component_2 = await attachComponentFencedFrameContext(1);

    await ad_component_1.execute(() => {
      window.component_1_var = 4;
    });

    // Check that ad_component_2 is its own separate frame.
    await ad_component_2.execute(() => {
      assert_equals(window.component_1_var, undefined);
    });
  });
}, 'Test creating and using multiple component ads in a FLEDGE auction');
</script>
</body>