Sets a highlight group. Note: Unlike the :highlight command which can update a highlight group, this function completely replaces the definition. For example: nvim_set_hl(0, 'Visual', {}) will clear the highlight group 'Visual'. Note: The fg and bg keys also accept the string values "fg" or "bg" which act as aliases to the corresponding foreground and background values of the Normal group. If the Normal group has not been defined, using these values results in an error. Parameters: ~ {ns_id} Namespace id for this highlight |nvim_create_namespace()|. Use 0 to set a highlight group globally |:highlight|. {name} Highlight group name, e.g. "ErrorMsg" {val} Highlight definition map, accepts the following keys: • fg (or foreground): color name or "#RRGGBB", see note. • bg (or background): color name or "#RRGGBB", see note. • sp (or special): color name or "#RRGGBB" • blend: integer between 0 and 100 • bold: boolean • standout: boolean • underline: boolean • undercurl: boolean • underdouble: boolean • underdotted: boolean • underdashed: boolean • strikethrough: boolean • italic: boolean • reverse: boolean • nocombine: boolean • link: name of another highlight group to link to, see |:hi-link|. • default: Don't override existing definition |:hi-default| • ctermfg: Sets foreground of cterm color |ctermfg| • ctermbg: Sets background of cterm color |ctermbg| • cterm: cterm attribute map, like |highlight-args|. If not set, cterm attributes will match those from the attribute map documented above.