mozilla-release/testing/web-platform/tests/web-share/share-without-user-gesture.https.html

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>WebShare Test: Share without user gesture error</title>
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
  </head>
  <body>
    <script>
        promise_test(t => {
          return promise_rejects(
              t, 'NotAllowedError',
              navigator.share({title: 'the title', text: 'the message',
                               url: 'data:the url'}));
        }, 'share without a user gesture');
    </script>
  </body>
</html>