/**
 * 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);
	}
})();