---
title: substringData
framework: WebKit JS
role: symbol
role_heading: Instance Method
platforms: [Safari Desktop 3.0+, Safari Mobile 1.0+]
path: webkitjs/characterdata/1629859-substringdata
---

# substringData

## Declaration

```data
DOMString? substringData(
    unsigned long offset, 
    unsigned long length
);
```