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Original file line number Diff line number Diff line change
@@ -1,35 +1 @@
/**
* File skip-link-focus-fix.js.
*
* Helps with accessibility for keyboard only users.
*
* This is the source file for what is minified in the twenty_twenty_one_skip_link_focus_fix() PHP function.
*
* Learn more: https://git.io/vWdr2
*
* @since Twenty Twenty-One 1.0
*/
( 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 );
}
}() );
// Internet Explorer support was removed.
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