Codebase Browser
chromium
Go to App

chromium/third_party/blink/web_tests/http/tests/inspector-protocol/resources/client-hint-delegate-ch-meta-tag-javascript-injection.html 

<!DOCTYPE html> 
<html>
  <head>
  </head>
  <body>
    <script type="text/javascript">
        document.head.innerHTML += '<meta http-equiv="Delegate-CH" content="Sec-CH-DPR https://foo.bar/">';
    </script>
  </body>
</html>