# DynamicOS

> Dynamic OS font assets provide the same functionality and performance as dynamic font assets. In the Editor, a Dynamic OS font asset depends on its source font file. For a Dynamic OS font asset to work in a build, the target platform must contain its source font file.

## Definition

* **Type:** Field
* **Namespace:** [UnityEngine.TextCore.Text](/engine/6000.7/script-reference/unityengine/textcore/text.md)
* **Assembly:** UnityEngine.TextCoreTextEngineModule

```csharp
DynamicOS = 2
```