index.html

<!DOCTYPE html>
<html>
  <head>
    <title>Web Share Testing</title>

  </head>
  <body>

    <h3>Share</h3>
    <button id="test-web-share">
      Share
    </button>

    <script>
      
      function directShare() {
        if (navigator.share !== undefined) {
            navigator.share({
              title: 'My awesome post!',
              text: 'This post may or may not contain the answer to the universe',
              url: window.location.href
            }).then(() => {
              //window.alert('Thanks for sharing!');
            })
            .catch(err => {
              //window.alert(`Couldn't share because of`, err);
            });
        }
      }
      

      document.querySelector('#test-web-share').addEventListener('click', () => {
        directShare()
      });
      
        function codeAddress() {
          alert("auto");
            directShare();
        }
        window.onload = codeAddress;
    </script>
  </body>
</html>