---
title: isDefaultNamespace
framework: WebKit JS
role: symbol
role_heading: Instance Method
platforms: [Safari Desktop 10.0+, Safari Mobile 10.0+]
path: webkitjs/node/1629712-isdefaultnamespace
---

# isDefaultNamespace

## Declaration

```data
boolean isDefaultNamespace(
    DOMString? namespaceURI
);
```