> ## Documentation Index
> Fetch the complete documentation index at: https://browseruse-0aece648-mintlify-cli-docs-1773354647.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# All Parameters

> Complete API reference for Browser Actor classes, methods, and parameters including BrowserSession, Page, Element, and Mouse

## Browser (BrowserSession)

Main browser session manager.

### Key Methods

```python theme={null}
from browser_use import Browser

browser = Browser()
await browser.start()

# Page management
page = await browser.new_page("https://example.com")
pages = await browser.get_pages()
current = await browser.get_current_page()
await browser.close_page(page)

# To stop the browser session
await browser.stop()
```

### Constructor Parameters

See [Browser Parameters](/open-source/customize/browser/all-parameters) for complete configuration options.

## Page

Browser tab/iframe for page-level operations.

### Navigation

* `goto(url: str)` - Navigate to URL
* `go_back()`, `go_forward()`, `reload()` - History navigation

### Element Finding

* `get_elements_by_css_selector(selector: str) -> list[Element]` - CSS selector
* `get_element(backend_node_id: int) -> Element` - By CDP node ID
* `get_element_by_prompt(prompt: str, llm) -> Element | None` - AI-powered
* `must_get_element_by_prompt(prompt: str, llm) -> Element` - AI (raises if not found)

### JavaScript & Controls

* `evaluate(page_function: str, *args) -> str` - Execute JS (arrow function format)
* `press(key: str)` - Send keyboard input ("Enter", "Control+A")
* `set_viewport_size(width: int, height: int)` - Set viewport
* `screenshot(format='jpeg', quality=None) -> str` - Take screenshot

### Information

* `get_url() -> str`, `get_title() -> str` - Page info
* `mouse -> Mouse` - Get mouse interface

### AI Features

* `extract_content(prompt: str, structured_output: type[T], llm) -> T` - Extract data

## Element

Individual DOM element interactions.

### Interactions

* `click(button='left', click_count=1, modifiers=None)` - Click element
* `fill(text: str, clear=True)` - Fill input
* `hover()`, `focus()` - Mouse/focus actions
* `check()` - Toggle checkbox/radio
* `select_option(values: str | list[str])` - Select dropdown options
* `drag_to(target: Element | Position)` - Drag and drop

### Properties

* `get_attribute(name: str) -> str | None` - Get attribute
* `get_bounding_box() -> BoundingBox | None` - Position/size
* `get_basic_info() -> ElementInfo` - Complete element info
* `screenshot(format='jpeg') -> str` - Element screenshot

## Mouse

Coordinate-based mouse operations.

### Operations

* `click(x: int, y: int, button='left', click_count=1)` - Click at coordinates
* `move(x: int, y: int, steps=1)` - Move mouse
* `down(button='left')`, `up(button='left')` - Press/release buttons
* `scroll(x=0, y=0, delta_x=None, delta_y=None)` - Scroll at coordinates