Web Share

<h1>This is a demo of the web share button</h1>
<p>
  Here is an image that you can <a class='web-share' href='https://placekitten.com/200/287'>share the URL</a>:
</p>
<p>
  <img src="http://placekitten.com/200/287" alt="Place holder image">
</p>

let shareButtons = document.querySelectorAll("a.web-share");
for (button of shareButtons) {
  button.addEventListener('click', function(e){
    let href = this.getAttribute('href');
    let alt = this.getAttribute('alt');
    if (navigator.share) {
      navigator.share({
        title: alt,
        url: href
      });
      e.preventDefault();
    }
  });
}