---
title: progressMarkUserInfoKey
framework: appkit
role: symbol
role_heading: Type Property
path: appkit/nsanimation/progressmarkuserinfokey
---

# progressMarkUserInfoKey

## Declaration

```swift
class let progressMarkUserInfoKey: String
```

## Discussion

Discussion Contains the value of an NSAnimation.Progress as an NSNumber instance that indicates the current animation progress. The value will be between 0.0 and 1.0.