## MutationObserverInit.AttributeOldValue property

Set to true if attributes is true or omitted and target’s attribute value before the mutation needs to be recorded.

```csharp
public bool AttributeOldValue { get; set; }
```

### See Also

* class [MutationObserverInit](../)
* namespace [Aspose.Html.Dom.Mutations](../../../aspose.html.dom.mutations/)
* assembly [Aspose.HTML](../../../)