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chromium/third_party/blink/web_tests/wpt_internal/third-party-script-detection/third-party-script-execution-contributors-ukm-metapixel.https.html 

<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src=resources/third-party-script-test-utils.js></script>
<script src="/service-workers/service-worker/resources/test-helpers.sub.js"></script>
<script>
  third_party_script_test(
    'script-execution',
    'https://connect.facebook.net/en_US/fbevents.js',
    1 << 5 /*Technology::kMetaPixel*/);
</script>