```javascript
var div = el('div');
div.attr('data-attribute', 'value');
```
```html
<div data-attribute="value"></div>
```

***

```javascript
el('div').attr({
  className : 'some-class-name',
  style : 'background: red'
});
```
```html
<div class="some-class-name" style="background: red"></div>
```