Suddenly when opening a CSS file in Vim (or when opening an HTML file,
because HTML syntax invokes CSS syntax), I see a huge lot of errors.
This is at patchlevel 9.1.296 or earlier. I didn't see it a few days
ago but I'm not sure at which changeset it appeared.

I'm copying below what I saw while opening one HTLM file :

"pub/public/nb_au/nbau.contents.html"

"pub/public/nb_au/nbau.contents.html" 26L, 799B
Error detected while processing BufRead Autocommands for
"*.html"..function dist#ft#FThtml[13]..FileType Autocommands for
"*"..Syntax Autocommands for "*"..function <SNR>11_SynSet[25]..script
/usr/local/share/vim/vim91/syntax/html.vim[308]../usr/local/share/vim/vim91/syntax/css.vim:
line  129:
E409: Unknown group name:
cssValue.*,cssFunction,cssColor,cssStringQ,cssStringQQ oneline
E475: Invalid argument: cssMathGroup contained
matchgroup=cssMathParens start="(" end=")"
containedin=cssFunction,cssMathGroup
contains=cssCustomProp,cssValue.*,cssFunction,cssColor,cssStringQ,cssStringQQ
oneline
line  130:
E409: Unknown group name:
cssValue.*,cssFunction,cssURL,cssColor,cssStringQ,cssStringQQ oneline
E475: Invalid argument: cssFunction contained
matchgroup=cssFunctionName start="\<\(var\|calc\)\s*(" end=")"
contains=cssCustomProp,cssValue.*,cssFunction,cssURL,cssColor,cssStringQ,cssStringQQ
oneline
line  453:
E409: Unknown group name:
css.*Prop,cssComment,cssValue.*,cssColor,cssURL,cssImportant,cssCustomProp,cssError,cssStringQ,cssStringQQ,cssFunction,cssUnicodeEscape,cssVendor,cssDefinition,cssHacks,cssNoise
fold
E475: Invalid argument: cssDefinition transparent matchgroup=cssBraces
start='{' end='}'
contains=cssTagName,cssAttributeSelector,cssClassName,cssIdentifier,cssAtRule,cssAttrRegion,css.*Prop,cssComment,cssValue.*,cssColor,cssURL,cssImportant,cssCustomProp,cssError,cssStringQ,cssStringQQ,cssFunction,cssUnicodeEscape,cssVendor,cssDefinition,cssHacks,cssNoise
fold
line  498:
E409: Unknown group name:
css.*Attr,cssColor,cssImportant,cssValue.*,cssFunction,cssString.*,cssURL,cssComment,cssUnicodeEscape,cssVendor,cssError,cssAttrComma,cssNoise
E475: Invalid argument: cssAttrRegion start=/:/
end=/\ze\(;\|)\|}\|{\)/ contained
contains=cssPseudoClassId,css.*Attr,cssColor,cssImportant,cssValue.*,cssFunction,cssString.*,cssURL,cssComment,cssUnicodeEscape,cssVendor,cssError,cssAttrComma,cssNoise
line  502:
E409: Unknown group name:
css.*Prop,css.*Attr,cssColor,cssImportant,cssValue.*,cssFunction,cssString.*,cssURL,cssComment,cssUnicodeEscape,cssVendor,cssError,cssAttrComma,cssNoise
E475: Invalid argument: cssAttrRegion start=/transition\s*:/
end=/\ze\(;\|)\|}\)/ contained
contains=css.*Prop,css.*Attr,cssColor,cssImportant,cssValue.*,cssFunction,cssString.*,cssURL,cssComment,cssUnicodeEscape,cssVendor,cssError,cssAttrComma,cssNoise
line  527:
E409: Unknown group name:
css.*Prop,cssValue.*,cssVendor,cssAtKeyword,cssComment
nextgroup=cssDefinition
E475: Invalid argument: cssAtRule start=/@supports\>/ end=/\ze{/
skipwhite skipnl
contains=cssAtRuleLogical,cssAttrRegion,css.*Prop,cssValue.*,cssVendor,cssAtKeyword,cssComment
nextgroup=cssDefinition
Error detected while processing BufRead Autocommands for
"*.html"..function dist#ft#FThtml[13]..FileType Autocommands for
"*"..Syntax Autocommands for "*"..function <SNR>11_SynSet[25]..script
/usr/local/share/vim/vim91/syntax/html.vim:
line  312:
E409: Unknown group name:
css.*Attr,css.*Prop,cssComment,cssLength,cssColor,cssURL,cssImportant,cssError,cssString,@htmlPreproc
E475: Invalid argument: htmlCssDefinition matchgroup=htmlArg
start='style="' keepend matchgroup=htmlString end='"'
contains=css.*Attr,css.*Prop,cssComment,cssLength,cssColor,cssURL,cssImportant,cssError,cssString,@htmlPreproc


Best regards,
Tony.

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