 Prints element start tag of a paintable section. Starts a paintable
     * section using the given tag. The PaintTarget may implement a caching
     * scheme, that checks the paintable has actually changed or can a cached
     * version be used instead. This method should call the startTag method.
 Prints element start tag of a paintable section. Starts a paintable
     * section using the given tag. The PaintTarget may implement a caching
     * scheme, that checks the paintable has actually changed or can a cached
     * version be used instead. This method should call the startTag method. | PaintTarget.java