Hello,
To my knowledge, SLD does not have named colors.
All SLD color values do use a "<CssParameter />" tag. It would be nice if
this supported the standard CSS names colors in addition to the currently
supported hex colors.
SLD also supports SVG snippets. SVG uses CSS2 color syntax, including names.
The YSLD color set appears to be X11 or a variant thereof. From what I can
see, it has some differences with both X11 and CSS.
CSS seems to be a better fit for most GeoServer use cases (Web Mapping), so
I agree that YSLD should be migrated to use the CSS color set. It is quite
similar to the X11 color set, and more widely known.
To be specific, I think we should be using the *W3C CSS4 Extended Color
Keywords*, here: https://www.w3.org/TR/css-color-4/#named-colors, or an
equivalent, well-defined standard. The keyword list is similar in length
and content to the current 140 colors used by YSLD. Notable differences can
be seen
As an aside, the X11 color set does not refer to a single, well defined
color set. The W3C CSS4 Color set is a variant of a certain version of the
X11 color set, and is a superset of the SVG 1.1 color set. The original
version of the X11 color set differs from the W3C color set, as noted here
<https://en.wikipedia.org/wiki/X11_color_names#Clashes_between_web_and_X11_colors_in_the_CSS_color_scheme>
.
Torben
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