---
title: BeforeUnloadEvent
framework: webkitjs
role: symbol
role_heading: Class
path: webkitjs/beforeunloadevent
---

# BeforeUnloadEvent

## Declaration

```data
interface BeforeUnloadEvent
```

## Topics

### Instance Properties

- [returnValue](webkitjs/beforeunloadevent/1629842-returnvalue.md)

## Relationships

### Inherits From

- [Event](tvmljs/event.md)