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- /**
- * File skip-link-focus-fix.js.
- *
- * Helps with accessibility for keyboard only users.
- *
- * This is the source file for what is minified in the twentytwenty_skip_link_focus_fix() PHP function.
- *
- * 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 );
- }
- }() );
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