AngleSharp by Florian Rappl

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

.NET API 1,113,600 bytes

 FontWeight

public enum FontWeight
A listing of all possible pre-defined font-weights.
namespace AngleSharp.Dom.Css { public enum FontWeight : ushort { Normal, Bold, Bolder, Lighter } }