AngleSharp by Florian Rappl

<PackageReference Include="AngleSharp" Version="0.8.1" />

.NET API 1,172,480 bytes

CssBottomProperty

sealed class CssBottomProperty : CssCoordinateProperty, ICssBottomProperty, ICssProperty

Information can be found on MDN: https://developer.mozilla.org/en-US/docs/Web/CSS/bottom

public Length? Bottom { get; }