MediaWiki:Gadget-Card.js

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const Card = {

	init( $content ) {
		$content.find( '.template-card-text' ).each( Card.trimList );
	},

	/**
	 * Trim lists of more than 10 items
	 * Example: [[Appropedia:Admin panel]]
	 */
	trimList() {
		const button = document.createElement( 'span' );
		button.textContent = 'more';
		button.style.cursor = 'pointer';
		button.onclick = event => $( event.target ).hide().siblings().show();
		$( this ).find( 'li' ).eq( 10 ).nextAll().hide().last().after( button );
	}
};

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