AngleSharp by Florian Rappl

<PackageReference Include="AngleSharp" Version="0.8.5" />

.NET API 1,113,600 bytes

 QuirksMode

enum QuirksMode
A list of possible quirks mode states.
using AngleSharp.Attributes; namespace AngleSharp.Dom { internal enum QuirksMode : ushort { Off, Limited, [DomDescription("BackCompat")] On } }