AngleSharp by Florian Rappl

<PackageReference Include="AngleSharp" Version="0.3.0" />

.NET API 479,232 bytes

 StyleSheetList

public sealed class StyleSheetList : IEnumerable<StyleSheet>, IEnumerable
A collection of CSS elements.
public StyleSheet this[int index] { get; }

Gets the stylesheet at the specified index. If index is greater than or equal to the number of style sheets in the list, this returns null.

public int Length { get; }

Gets the number of elements in the list of stylesheets.

public IEnumerator<StyleSheet> GetEnumerator()

Returns an enumerator that iterates through the stylesheets.