A jQuery snippet to copy text on button click, with the button wording briefly changing to give feedback to the user. NOTE: for modern browsers, there are simpler ways to do this. This solution needed to be jQuery and work in IE.

copyText.js

/**************************************
 * Copy text (jQuery)
*/
/*
 * HOW TO USE:
 *	1. Select text: <span id="[unique id of text to be copied]">[text to copy]</span>
 *	2. Run script on next button: <button type="button" class="button button--link-style" onClick="copyToClipboard($('#[id of text to be copied]'))" aria-label="Copy [text or description of text to be copied] to your clipboard">Copy</button>
*/ 

function copyToClipboard(element) {
  var $temp = $("<input>");
  $("body").append($temp);
  $temp.val($(element).text()).select();
  document.execCommand("copy");
  $temp.remove();

  var $btn = $(element).next(); // selects next button to the text. HTML order is important here
  $btn.text("Copied!");
  setTimeout(function() {
    $btn.text("Copy");
  }, 1500);
}