AngleSharp by Florian Rappl

<PackageReference Include="AngleSharp" Version="0.6.0" />

.NET API 844,288 bytes

 CSSTransformStyleProperty

public sealed class CSSTransformStyleProperty : CSSProperty
Information can be found on MDN: https://developer.mozilla.org/en-US/docs/Web/CSS/transform-style
public bool IsFlat { get; }

Gets if the children of the element are lying in the plane of the element itself. Otherwise the children of the element should be positioned in the 3D-space.