chromium/chrome/test/data/digital_credentials.html

<html>

<head>
  <title>FedCM MDocs Test Page</title>
</head>
<script>
  async function request(fields) {
    const mdoc = await navigator.identity.get({
      digital: {
        providers: [{
          protocol: "openid4vp",
          request: JSON.stringify({
            presentation_definition: {
              id: "mDL-request-demo",
              input_descriptors: [{
                id: "org.iso.18013.5.1.mDL",
                constraints: {
                  fields: fields
                }
              }]
            }
          })
        }]
      }
    });
   const token = mdoc.data;
   document.getElementById("log").textContent += `${token}`;
  }

  async function requestAgeOnly() {
    const fields = [{
      path: [
        "$['org.iso.18013.5.1']['age_over_21']"
      ]
    }];
    request(fields);
  }

  async function requestAgeAndName() {
    const fields = [{
      path: [
        "$['org.iso.18013.5.1']['age_over_21']"
      ]
    }, {
      path: [
        "$['org.iso.18013.5.1']['given_name']"
      ]
    }];
    request(fields);
  }
</script>

<body>
  <button id="request_age_only_button" onclick="requestAgeOnly()">Request Age Only</button>
  <button id="request_age_and_name_button" onclick="requestAgeAndName()">Request Age and Name</button>
  <textarea id="log"></textarea>
</body>

</html>