/**
 * File skip-link-focus-fix.js.
 *
 * Helps with accessibility for keyboard only users.
 *
 * Learn more: https://git.io/vWdr2
 */
(function () {
  "use strict";
  var isIe = /(trident|msie)/i.test(navigator.userAgent);

  if (isIe && document.getElementById && window.addEventListener) {
    window.addEventListener(
      "hashchange",
      function () {
        var id = location.hash.substring(1),
          element;

        if (!/^[A-z0-9_-]+$/.test(id)) {
          return;
        }

        element = document.getElementById(id);

        if (element) {
          if (!/^(?:a|select|input|button|textarea)$/i.test(element.tagName)) {
            element.tabIndex = -1;
          }

          element.focus();
        }
      },
      false
    );
  }
})();