inAppNotificationButton.xhtml

Enable keyboard shortcuts

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">

  <head>

    <meta charset="utf-8" />

    <title>In app notification button test</title>

    <script src="chrome://messenger/content/in-app-notification-button.mjs" type="module"></script>

  </head>

  <body>

    <a is="in-app-notification-button" href="https://example.com">Test Button</a>

  </body>

</html>