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chromium/third_party/blink/web_tests/external/wpt/html/semantics/embedded-content/media-elements/autoplay-supported-by-feature-policy.html 

<!DOCTYPE html>
<title>Test that autoplay is advertised in the feature list</title>
<link rel="help" href="https://w3c.github.io/webappsec-feature-policy/#dom-featurepolicy-features">
<link rel="help" href="https://html.spec.whatwg.org/multipage/infrastructure.html#policy-controlled-features">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
test(() => {
    assert_in_array('autoplay', document.featurePolicy.features());
}, 'document.featurePolicy.features should advertise autoplay.');
</script>