def render(format = :html, position = :prefix, colors = Screen.default_css_colors)
			case format
			when :html
				case position
				when :prefix
					style_code = css_style(colors)
					if style_code
						return %Q|<span style="#{style_code}">|
					else
						return ''
					end
				when :postfix
					style_code = css_style(colors)
					if style_code
						return '</span>'
					else
						return ''
					end
				end
			when :text
				return ''
			end
		end
def render(format = :html, position = :prefix, colors = Screen.default_css_colors)
			case format
			when :html
				case position
				when :prefix
					style_code = css_style(colors)
					if style_code
						return %Q|<span style="#{style_code}">|
					else
						return ''
					end
				when :postfix
					style_code = css_style(colors)
					if style_code
						return '</span>'
					else
						return ''
					end
				end
			when :text
				return ''
			end
		end
renders self as :html or :text _format_ - makes a <span> html scriptlet.
 _colors_ can be Screen.default_css_colors(_inverted_, _bright_).