mediawiki-skins-Vector/resources/skins.vector.js/tables.js

const init = () => {
	const tables = document.querySelectorAll( '.mw-parser-output table' );
	Array.from( tables ).forEach( ( table ) => {
		// Don't wrap tables within tables
		const parent = table.parentElement;
		if ( parent && !parent.matches( '.noresize' ) && !parent.closest( 'table' ) ) {
			const wrapper = document.createElement( 'div' );
			wrapper.classList.add( 'noresize' );
			parent.insertBefore( wrapper, table );
			wrapper.appendChild( table );
		}
	} );
};

module.exports = {
	init
};