Codebase Browser
chromium
Go to App

chromium/third_party/blink/web_tests/http/tests/notifications/resources/display-permission.html 

<!-- This resource is part of notification-sandbox-permissions.html -->
<!DOCTYPE html>
<html>
    <head>
        <title>Page which displays whether permission for displaying notification has been granted.</title>
    </head>
    <body>
        <p id="has-permission">Unknown</p>
        <script>
            document.getElementById('has-permission').textContent = Notification.permission;
        </script>
    </body>
</html>