code: function normalizeCssText( unparsedCssText, nativeNormalize )
  	{
  		var styleText;
  		if ( nativeNormalize !== false )
  		{
  			// Injects the style in a temporary span object, so the browser parses it,
  			// retrieving its final format.
  			var temp = new CKEDITOR.dom.element( 'span' );
  			temp.setAttribute( 'style', unparsedCssText );
  			styleText = temp.getAttribute( 'style' ) || '';
  		}
  		else
  			styleText = unparsedCssText;
  
  		// Normalize font-family property, ignore quotes and being case insensitive. (#7322)
  		// http://www.w3.org/TR/css3-fonts/#font-family-the-font-family-property
  		styleText = styleText.replace( /(font-family:)(.*?)(?=;|$)/, function ( match, prop, val )
  		{
  			var names = val.split( ',' );
  			for ( var i = 0; i < names.length; i++ )
  				names[ i ] = CKEDITOR.tools.trim( names[ i ].replace( /["']/g, '' ) );
  			return prop + names.join( ',' );
  		});
  
  		// Shrinking white-spaces around colon and semi-colon (#4147).
  		// Compensate tail semi-colon.
  		return styleText.replace( /\s*([;:])\s*/, '$1' )
  							 .replace( /([^\s;])$/, '$1;')
  				 			// Trimming spaces after comma(#4107),
  				 			// remove quotations(#6403),
  				 			// mostly for differences on "font-family".
  							 .replace( /,\s+/g, ',' )
  							 .replace( /\"/g,'' )
  							 .toLowerCase();
  	}
docs: Make the comparison of style text easier by standardizing it.