Scalar skin (Example of a Vector derived skin)

scalar.php

<?php
/**
 * Scalar skin
 *
 * @file
 * @ingroup Skins
 */

if( !defined( 'MEDIAWIKI' ) ) die( "This is an extension to the MediaWiki package and cannot be run standalone." );

$wgValidSkinNames['scalar'] = 'Scalar';
$wgAutoloadClasses['SkinScalar'] = dirname(__FILE__).'/Scalar.skin.php';

$wgResourceModules['skins.scalar'] = array(
	'styles' => array(
		'scalar/screen.css' => array( 'media' => 'screen' ),
	),
	'remoteBasePath' => &$GLOBALS['wgStylePath'],
	'localBasePath' => &$GLOBALS['wgStyleDirectory'],
);

Scalar.skin.php

<?php
/**
 * Scalar
 *
 * @file
 * @ingroup Skins
 */

if( !defined( 'MEDIAWIKI' ) )
	die( -1 );

require_once( dirname( __FILE__ ) . '/../Vector.php' );

/**
 * @ingroup Skins
 */
class SkinScalar extends SkinVector {
	var $skinname = 'scalar', $stylename = 'scalar';

	/**
	 * @param $out OutputPage
	 */
	function setupSkinUserCss( OutputPage $out ) {
		global $wgHandheldStyle;
		parent::setupSkinUserCss( $out );

		$out->addModuleStyles( 'skins.scalar' );
	}
}