AngleSharp by Florian Rappl

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

.NET API 1,172,480 bytes

CssMarginLeftProperty

sealed class CssMarginLeftProperty : CssMarginPartProperty, ICssMarginLeftProperty, ICssProperty

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

public Length? Left { get; }