chromium/chromecast/browser/test/data/interface_binding.html

<html>
    <head><title>Binding some Mojo interfaces</title></head>
    <body>
        <script>
          function bindInterface(name) {
            const {handle0, handle1} = Mojo.createMessagePipe();
            Mojo.bindInterface(name, handle0);
          }

          // The browser test which uses this page will succeed once these
          // bindInterface requests reach browser-side binders registered by
          // the test.
          bindInterface('chromecast.mojom.TestAdder');
          bindInterface('chromecast.mojom.TestDoubler');
        </script>
    </body>
</html>