WordPress/wp-admin/js/accordion.js

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JavaScript
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jQuery(document).ready( function($) {
// Expand/Collapse
$('.accordion-section-title').on('click keydown', function( event ) {
if ( event.type === 'keydown' && 13 !== event.which ) // enter
return;
var clicked = $( this ).closest( '.accordion-section' );
if ( clicked.hasClass('cannot-expand') )
return;
clicked.closest( '.accordion-container' ).find( '.accordion-section' ).not( clicked ).removeClass( 'open' );
clicked.toggleClass( 'open' );
event.preventDefault();
});
});