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33 lines
794 B
33 lines
794 B
/** |
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* File skip-link-focus-fix.js. |
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* |
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* Helps with accessibility for keyboard only users. |
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* |
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* This is the source file for what is minified in the twentynineteen_skip_link_focus_fix() PHP function. |
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* |
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* Learn more: https://git.io/vWdr2 |
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*/ |
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( function() { |
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var isIe = /(trident|msie)/i.test( navigator.userAgent ); |
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if ( isIe && document.getElementById && window.addEventListener ) { |
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window.addEventListener( 'hashchange', function() { |
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var id = location.hash.substring( 1 ), |
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element; |
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if ( ! ( /^[A-z0-9_-]+$/.test( id ) ) ) { |
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return; |
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} |
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element = document.getElementById( id ); |
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if ( element ) { |
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if ( ! ( /^(?:a|select|input|button|textarea)$/i.test( element.tagName ) ) ) { |
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element.tabIndex = -1; |
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} |
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element.focus(); |
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} |
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}, false ); |
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} |
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} )();
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