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understrap/js/skip-link-focus-fix.js

34 lines
901 B
JavaScript

/**
* skip-link-focus-fix.js
*
* Helps with accessibility for keyboard only users.
*
* Learn more: https://github.com/Automattic/_s/pull/136
*/
( 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 ) && 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 );
}
})();