AngleSharp by Florian Rappl

<PackageReference Include="AngleSharp" Version="0.7.0" />

.NET API 997,888 bytes

 IExtensionService<TInterface>

public interface IExtensionService<TInterface> : IService
Represents an extension offering a special kind of (DOM) interface.
TInterface this[string origin] { get; }

Gets the interface specialized for the given address.