MicrosoftAjaxCssMinifier does not support CSS :has() pseudo-class

Hello,

I'm currently using BundleTransformer in an ASP.NET project and have come across an issue with the MicrosoftAjaxCssMinifier.

Here is the usage of BundleTransformer in my project:

bundles.Add(new CustomStyleBundle("~/bundles/SampleStyles").Include(
    "~/App/Sample.less"
));

And the BundleTransformer configuration:

<css defaultMinifier="MicrosoftAjaxCssMinifier">
  <translators>
    <add name="NullTranslator" type="BundleTransformer.Core.Translators.NullTranslator, BundleTransformer.Core" enabled="false" />
    <add name="LessTranslator" type="BundleTransformer.Less.Translators.LessTranslator, BundleTransformer.Less" />
  </translators>
  <postProcessors>
    <add name="UrlRewritingCssPostProcessor" type="BundleTransformer.Core.PostProcessors.UrlRewritingCssPostProcessor, BundleTransformer.Core" useInDebugMode="false" />
  </postProcessors>
  <minifiers>
    <add name="NullMinifier" type="BundleTransformer.Core.Minifiers.NullMinifier, BundleTransformer.Core" />
    <add name="MicrosoftAjaxCssMinifier" type="BundleTransformer.MicrosoftAjax.Minifiers.MicrosoftAjaxCssMinifier, BundleTransformer.MicrosoftAjax" />
  </minifiers>
  <fileExtensions>
    <add fileExtension=".css" assetTypeCode="Css" />
    <add fileExtension=".less" assetTypeCode="Less" />
  </fileExtensions>
</css>

When trying to minify CSS code with MicrosoftAjaxCssMinifier that includes the :has() pseudo-class, it throws the following error:

BundleTransformer.Core.Minifiers.AssetMinificationException: During minification of CSS-code, readed from the file '/App/Sample.less', by Microsoft Ajax CSS-minifier syntax error has occurred. 
See more details:Message: Expected identifier, found ':'
Error code: CSS1030
Severity: 0
Subcategory: run-time
File: /App/Sample.less
Start line: 118
Start column: 18
End line: 0
End column: 0 ---> BundleTransformer.MicrosoftAjax.MicrosoftAjaxParsingException: Message: Expected identifier, found ':'
Severity: 0
Subcategory: run-time
File: /App/Sample.less
Start line: 118
Start column: 18
End line: 0
End column: 0
   at void BundleTransformer.MicrosoftAjax.Minifiers.MicrosoftAjaxCssMinifier.ParserErrorHandler(object source, ContextErrorEventArgs args)
   at void Microsoft.Ajax.Utilities.CssParser.OnCssError(ContextError cssError)
   at Parsed Microsoft.Ajax.Utilities.CssParser.ParsePseudo()
   at Parsed Microsoft.Ajax.Utilities.CssParser.ParseSimpleSelector()
   at Parsed Microsoft.Ajax.Utilities.CssParser.ParseSelector()
   at Parsed Microsoft.Ajax.Utilities.CssParser.ParseRule()
   at Parsed Microsoft.Ajax.Utilities.CssParser.ParseStylesheet()
   at string Microsoft.Ajax.Utilities.CssParser.Parse(string source)
   at void BundleTransformer.MicrosoftAjax.Minifiers.MicrosoftAjaxCssMinifier.InnerMinify(IAsset asset, CssParser cssParser)
   --- End of inner exception stack trace ---

Would it be possible to consider supporting the :has() pseudo-class and other newer CSS features in MicrosoftAjaxCssMinifier to prevent minification errors or am I missing something here?

Thanks for the help.

Taritsyn / BundleTransformer

MicrosoftAjaxCssMinifier does not support CSS :has() pseudo-class #78