AngleSharp by Florian Rappl

<PackageReference Include="AngleSharp" Version="0.5.1" />

.NET API 737,792 bytes

 CSSZIndexProperty

public sealed class CSSZIndexProperty : CSSProperty
Information can be found on MDN: https://developer.mozilla.org/en-US/docs/Web/CSS/z-index
public bool HasIndex { get; }

Gets if the z-index has been set at all.

public int Index { get; }

Gets the index in the stacking order, if any.