AngleSharp by Florian Rappl

<PackageReference Include="AngleSharp" Version="0.2.0" />

.NET API 372,224 bytes

CSSGroupingRule

public abstract class CSSGroupingRule : CSSRule

public CSSRuleList CssRules { get; }

public CSSGroupingRule()

public CSSGroupingRule DeleteRule(int index)

public int InsertRule(string rule, int index)