AngleSharp by Florian Rappl

<PackageReference Include="AngleSharp" Version="0.8.0" />

.NET API 1,171,968 bytes

 ICssStyleSheet

public interface ICssStyleSheet : IStyleSheet
Represents the CSS style sheet for storing CSS styles.
using AngleSharp.Attributes; namespace AngleSharp.Dom.Css { [DomName("CSSStyleSheet")] public interface ICssStyleSheet : IStyleSheet { [DomName("ownerRule")] ICssRule OwnerRule { get; } [DomName("cssRules")] ICssRuleList Rules { get; } string CssText { get; } [DomName("insertRule")] int Insert(string rule, int index); [DomName("deleteRule")] void RemoveAt(int index); } }