/**
 * file skip-link-focus-fix.js.
 *
 * helps with accessibility for keyboard only users.
 *
 * learn more: https://git.io/vwdr2
 */
(function() {
	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 );
	}
})();