ext.scribunto.errors.js
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ext.scribunto.errors.js
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	( () => {

	mw.hook( 'wikipage.content' ).add( () => {
	const regex = /\bmw-scribunto-error-(\w+)\b/;
	let popup;

	$( '.scribunto-error' ).each( ( index, span ) => {
	let matches = regex.exec( span.className );
	if ( matches === null ) {
	// T375539: backward-compatibility with old cached HTML
	matches = regex.exec( span.id );
	}
	if ( matches === null ) {
	mw.log( 'mw.scribunto.errors: regex mismatch!' );
	return;
	}
	const $span = $( span );
	$span.on( 'click', () => {
	const error = mw.config.get( 'ScribuntoErrors-' + matches[ 1 ] );
	if ( typeof error !== 'string' ) {
	mw.log( 'mw.scribunto.errors: error ' + matches[ 1 ] + ' not found.' );
	return;
	}

	if ( !popup ) {
	popup = new OO.ui.PopupWidget( {
	padded: true,
	head: true,
	label: $( '<div>' )
	.text( mw.msg( 'scribunto-parser-dialog-title' ) )
	.addClass( 'scribunto-error-label' )
	} );
	OO.ui.getDefaultOverlay().append( popup.$element );
	}
	popup.$body.html( error );
	popup.setFloatableContainer( $span );
	popup.toggle( true );
	} );
	} );
	} );

	} )();