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Core Architecture

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Core Classes

  • Browser (alias: BrowserSession): Main session manager
  • Page: Represents a browser tab/iframe
  • Element: Individual DOM element operations
  • Mouse: Coordinate-based mouse operations

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Basic Usage

from browser_use import Browser, Agent
from browser_use.llm.openai.chat import ChatOpenAI

async def main():
    llm = ChatOpenAI(api_key="your-api-key")
    browser = Browser()
    await browser.start()

    # 1. Actor: Precise navigation and element interactions
    page = await browser.new_page("https://github.com/login")
    email_input = await page.must_get_element_by_prompt("username field", llm=llm)
    await email_input.fill("your-username")

    # 2. Agent: AI-driven complex tasks
    agent = Agent(browser=browser, llm=llm)
    await agent.run("Complete login and navigate to my repositories")

    await browser.stop()

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Important Notes

  • Not Playwright: Actor is built on CDP, not Playwright. The API resembles Playwright as much as possible for easy migration, but is sorta subset.
  • Immediate Returns: get_elements_by_css_selector() doesn’t wait for visibility
  • Manual Timing: You handle navigation timing and waiting
  • JavaScript Format: evaluate() requires arrow function format: () => {}