css_html_color_name_p

css_html_color_name_p   font_name

returns 1 if font_name is one of the html defined font names and returns 0 otherwise

Source code:

    if { [lsearch -exact { white silver gray maroon green navy purple olive teal black red lime blue magenta yellow cyan} $font_name] != -1 } {
	return 1
    } else {
	return 0
    }