themes-wordpress/libretto/js/skip-link-focus-fix.js

(function() {
	var is_webkit = navigator.userAgent.toLowerCase().indexOf( 'webkit' ) > -1,
		is_opera = navigator.userAgent.toLowerCase().indexOf( 'opera' ) > -1,
		is_ie = navigator.userAgent.toLowerCase().indexOf( 'msie' ) > -1;

	if ((is_webkit || is_opera || is_ie) && 'undefined' !== typeof(document.getElementById)) {
		var eventMethod = (window.addEventListener) ? 'addEventListener' : 'attachEvent';
		window[eventMethod]('hashchange', function() {
			var element = document.getElementById( location.hash.substring( 1 ) );

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

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