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Chromium 是 Playwright 支持的浏览器之一，Playwright 是一个用于控制浏览器自动化的库。 通过运行 p.chromium.launch(headless=True)，我们启动了一个无头的 Chromium 实例。 无头模式意味着浏览器在没有图形用户界面的情况下运行。 在下面的示例中，我们将使用 AsyncChromiumLoader 加载页面，然后使用 Html2TextTransformer 去除 HTML 标签和其他语义信息。 
pip install -qU playwright beautifulsoup4 html2text
!playwright install
注意： 如果您使用 Jupyter notebooks，在加载文档之前可能还需要安装并应用 nest_asyncio： 
!pip install nest-asyncio
import nest_asyncio

nest_asyncio.apply()

from langchain_community.document_loaders import AsyncChromiumLoader

urls = ["https://docs.langchain.com/langsmith/home"]
loader = AsyncChromiumLoader(urls, user_agent="MyAppUserAgent")
docs = loader.load()
docs[0].page_content[0:100]

'<!DOCTYPE html><html lang="en" dir="ltr" class="docs-wrapper docs-doc-page docs-version-2.0 plugin-d'
现在让我们使用转换器将文档转换为更易读的格式： 
from langchain_community.document_transformers import Html2TextTransformer

html2text = Html2TextTransformer()
docs_transformed = html2text.transform_documents(docs)
docs_transformed[0].page_content[0:500]

'Skip to main content\n\nGo to API Docs\n\nSearch`⌘``K`\n\nGo to App\n\n  * Quick start\n  * Tutorials\n\n  * How-to guides\n\n  * Concepts\n\n  * Reference\n\n  * Pricing\n  * Self-hosting\n\n  * LangGraph Cloud\n\n  *   * Quick start\n\nOn this page\n\n# Get started with LangSmith\n\n**LangSmith** is a platform for building production-grade LLM applications. It\nallows you to closely monitor and evaluate your application, so you can ship\nquickly and with confidence. Use of LangChain is not necessary - LangSmith\nworks on it'
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