# Assets - HTML Templates

The HTML Template Asset is one of the types of content that can comprise a BRJS application. There is more information about [assets on About Bundlers.](bladerunner-about-bundlers.md#assets)

HTML templates are used to build user interfaces. The HTML bundler enforces a namespacing convention, to ensure that someone working in a **blade** cannot accidently overwrite an HTML template in another blade. An error is reported if a template violates the namespacing convention.

The bundler verifies that the first top-level element in each file has an _id_ attribute, and that the attribute complies with the namespacing convention.

For example, say you have an HTML template (a "**View**" in _Presenter_ parlance) with a top level element like this:

```html
<div id="novotrader.fx.tile.fx_tile">

  ...

</div>
```

We could tell that the name of the **app** it belongs to is **_novotrader_**, the **bladeset** is called **_fx_** and the blade is called **_tile_**.