toc.js
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toc.js
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	( function () {
	'use strict';

	function initToc( tocNode ) {
	const toggleNode = tocNode.querySelector( '.toctogglecheckbox' );

	if ( !toggleNode ) {
	return;
	}

	let hidden = false;

	toggleNode.addEventListener( 'change', () => {
	hidden = !hidden;
	mw.cookie.set( 'hidetoc', hidden ? '1' : null );
	toggleNode.setAttribute( 'aria-label', hidden ?
	mw.message( 'table-of-contents-show-button-aria-label' ).plain() :
	mw.message( 'table-of-contents-hide-button-aria-label' ).plain()
	);
	} );

	// Initial state
	if ( mw.cookie.get( 'hidetoc' ) === '1' ) {
	toggleNode.checked = true;
	hidden = true;
	}
	toggleNode.setAttribute( 'aria-label', hidden ?
	mw.message( 'table-of-contents-show-button-aria-label' ).plain() :
	mw.message( 'table-of-contents-hide-button-aria-label' ).plain()
	);
	}

	mw.hook( 'wikipage.content' ).add( ( $content ) => {
	const tocs = $content[ 0 ] ? $content[ 0 ].querySelectorAll( '.toc' ) : [];
	let i = tocs.length;
	while ( i-- ) {
	initToc( tocs[ i ] );
	}
	} );
	}() );