Replaces copied text with a link to the page it is copied from, limits chars to 100

copyText.html

<script>
document.addEventListener('copy', function(e) {
  var pageLink = '\n\n Read more at: ' + document.location.href;
  var modifiedText = window.getSelection().toString().length > 100 ? window.getSelection().toString().substring(0,100) + pageLink : window.getSelection().toString() + pageLink;

  if (e.clipboardData) {
        e.clipboardData.setData('Text', modifiedText);
    }
    e.preventDefault();
});
</script>