Copy any text to clipboard

copyToClipboard.html

<script>
// A simple function to copy a string to clipboard.
// This works in most modern browsers, although you won't be able to tell if the copy command succeeded.
// See https://github.com/lgarron/clipboard-polyfill for a more robust solution.
function copyToClipboard(str) {
  function listener(e) {
    e.preventDefault();
    e.clipboardData.setData("text/plain", str);
  }
  document.addEventListener("copy", listener);
  document.execCommand("copy");
  document.removeEventListener("copy", listener);
};
</script>

<button onclick="copyToClipboard(this.textContent)">Copy me!</button>