MediaWiki:Gadget-Notice.js

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const Notice = {

	init( $content ) {
		$content.find( '.template-notice-more' ).on( 'click', Notice.toggle );
	},

	toggle() {
		this.closest( '.template-notice' ).classList.toggle( 'collapse' );
	}
};

mw.hook( 'wikipage.content' ).add( Notice.init );