# API

[htmlelement]: https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement

[nodelist]: https://developer.mozilla.org/en-US/docs/Web/API/NodeList

## assert.dom()

Once installed the DOM element assertions are available at `assert.dom(...).*`:

**Parameters**

-   `target` **([string](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String) \| [HTMLElement](https://developer.mozilla.org/en-US/docs/Web/HTML/Element))** A CSS selector that can be used to find elements using [`querySelector()`](https://developer.mozilla.org/de/docs/Web/API/Document/querySelector), or an [HTMLElement][] (Not all assertions support both target types.)
-   `rootElement` **[HTMLElement](https://developer.mozilla.org/en-US/docs/Web/HTML/Element)?** The root element of the DOM in which to search for the `target` (optional, default `document`)

**Examples**

```javascript
test('the title exists', function(assert) {
  assert.dom('#title').exists();
});
```

## Assertions

<!-- Generated by documentation.js. Update this documentation by updating the source code. -->

### exists

Assert an [HTMLElement][] (or multiple) matching the `selector` exists.

**Parameters**

-   `options` **[object](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object)?** 
-   `message` **[string](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String)?** 

**Examples**

```javascript
assert.dom('#title').exists();
assert.dom('.choice').exists({ count: 4 });
```

### doesNotExist

Assert an [HTMLElement][] matching the `selector` does not exists.

**Parameters**

-   `message` **[string](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String)?** 

**Examples**

```javascript
assert.dom('.should-not-exist').doesNotExist();
```

### isFocused

Assert that the [HTMLElement][] or an [HTMLElement][] matching the
`selector` is currently focused.

**Parameters**

-   `message` **[string](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String)?** 

**Examples**

```javascript
assert.dom('input.email').isFocused();
```

### isNotFocused

Assert that the [HTMLElement][] or an [HTMLElement][] matching the
`selector` is not currently focused.

**Parameters**

-   `message` **[string](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String)?** 

**Examples**

```javascript
assert.dom('input[type="password"]').isNotFocused();
```

### hasText

Assert that the text of the [HTMLElement][] or an [HTMLElement][]
matching the `selector` matches the `expected` text, using the
[`textContent`](https://developer.mozilla.org/en-US/docs/Web/API/Node/textContent)
attribute and stripping/collapsing whitespace.

`expected` can also be a regular expression.

**Parameters**

-   `expected` **([string](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String) \| [RegExp](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp))** 
-   `message` **[string](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String)?** 

**Examples**

```javascript
// <h2 id="title">
//   Welcome to <b>QUnit</b>
// </h2>

assert.dom('#title').hasText('Welcome to QUnit');
```

```javascript
assert.dom('.foo').hasText(/[12]\d{3}/);
```

### hasTextContaining

Assert that the text of the [HTMLElement][] or an [HTMLElement][]
matching the `selector` contains the given `text`, using the
[`textContent`](https://developer.mozilla.org/en-US/docs/Web/API/Node/textContent)
attribute.

**Parameters**

-   `text` **[string](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String)** 
-   `message` **[string](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String)?** 

**Examples**

```javascript
assert.dom('#title').hasTextContaining('Welcome');
```