Scripting API

TransitionEventBase<T>

class in UnityEngine.UIElements · UnityEngine.CoreModule · inherits from EventBase<T>

Not in Unity's public API, or in an assembly the coverage doesn't count.
In Tassix

A transition's event: it trickles down and bubbles up.

Properties 2

double elapsedTime { get; }
StylePropertyNameCollection stylePropertyNames { get; }

Methods 2

bool AffectsProperty(StylePropertyName stylePropertyName)
static T GetPooled(StylePropertyName stylePropertyName, double elapsedTime)