Bug 277873 [CSS] Exception handling for illegal color name
examples/org.eclipse.e4.ui.examples.css/src/org/eclipse/e4/ui/examples/css/editor/AbstractCSSEditor.java
* @return
	 */
	protected abstract IElementProvider getNativeWidgetElementProvider();
	/**
	 * Return HTML Element provider.
	 * 
	 * @return
	 */
	protected abstract IElementProvider getHTMLElementProvider();
	/**
	 * Return style sheet content.
	 * 
	 * @return
	 */
	protected abstract String getStyleSheetContent();
	/**
	 * Set style sheet content.
	 * 
	 * @param content
	 */
	protected abstract void setStyleSheetContent(String content);
	/**
	 * Set CSS Engine status.
	 * 
	 * @param status
	 */
	protected abstract void setCSSEngineStatuts(String status);
	/**
	 * Return true if Styles must be applied to the fully Window and false
	 * otherwise.