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chromium/third_party/blink/web_tests/wpt_internal/digital-credentials/support/api_availability_iframe.html 

<!DOCTYPE html>
<script type="module">
import { check_digital_credential_api_availability } from './helper.js';

async function test() {
  const request_succeeded = await check_digital_credential_api_availability();
  window.parent.postMessage({ type: 'availability-result', enabled: request_succeeded }, '*');
}

test();
</script>