AngleSharp by Florian Rappl

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

.NET API 372,224 bytes

CSSStyleSheet

public class CSSStyleSheet : StyleSheet

public CSSRuleList CssRules { get; }

public CSSRule OwnerRule { get; }

public CSSStyleSheet()

public CSSStyleSheet DeleteRule(int index)

public CSSStyleSheet InsertRule(string rule, int index)