net40-client 
namespace System.Windows.Media.Animation
{
    [Localizability(LocalizationCategory.None, Readability = Readability.Unreadable)]
    [RuntimeNameProperty("Name")]
    public abstract class Timeline : Animatable
    {
        protected internal Duration GetNaturalDuration(Clock clock);
    }
}
.NET 5.06.07.08.09.0
.NET Core 3.03.1
.NET Framework 3.03.54.04.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
Information specific to net40-client
Assembly

PresentationCore , Version=4.0.0.0, PublicKeyToken=31bf3856ad364e35

Referencing

Your project needs to set <UseWPF>True</UseWPF>.

Platform Restrictions

This framework does not have platform annotations.

  • Built-in API
  • Package-provided API