ext.dismissableSiteNotice.js
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ext.dismissableSiteNotice.js
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	( function () {

	const cookieName = 'dismissSiteNotice',
	siteNoticeId = mw.config.get( 'wgSiteNoticeId' );

	// If no siteNoticeId is set, exit.
	if ( !siteNoticeId ) {
	return;
	}

	// If the user has the notice dismissal cookie set, exit.
	if ( $.cookie( cookieName ) === siteNoticeId ) {
	return;
	}

	// Otherwise, show the notice ...
	mw.util.addCSS( '.client-js .mw-dismissable-notice { display: block; }' );

	// ... and enable the dismiss button.
	$( () => {
	// eslint-disable-next-line no-jquery/no-global-selector
	$( '.mw-dismissable-notice-close' )
	.css( 'visibility', 'visible' )
	.find( 'a' )
	.on( 'click keypress', function ( e ) {
	if (
	e.type === 'click' \|\|
	e.type === 'keypress' && e.which === 13
	) {
	$( this ).closest( '.mw-dismissable-notice' ).hide();
	$.cookie( cookieName, siteNoticeId, {
	expires: 30,
	path: '/'
	} );
	}
	} );
	} );

	}() );