How to Get HTML Source in Selenium WebDriver

Answer

In Selenium WebDriver, you can retrieve the full HTML source of a page using driver.page_source in Python or getPageSource() in Java. This returns the current DOM as a string, which can be used for validation, scraping, or debugging automation flows.

Detailed Explanation

Selenium interacts with a browser instance, meaning it can access the rendered DOM after JavaScript execution. The HTML source retrieved is not always identical to the original server response, because modern websites often modify the DOM dynamically using JavaScript, AJAX, or API calls.

When driver.get() loads a page, Selenium maintains a live representation of the DOM. Calling page_source captures a snapshot of this DOM at that moment. This makes it highly useful for scraping dynamic pages, but it may also include elements injected after page load or exclude content that has not yet rendered.

For automation and scraping workflows, understanding this difference is critical. Many security management systems and CAPTCHA protections rely on dynamic rendering, meaning raw HTML alone may not be sufficient for reliable data extraction.

Solutions / Methods

• Use page_source property: In Python Selenium, access driver.page_source after page load to capture full DOM content including JavaScript-rendered elements.
• Use getPageSource() in Java: This method returns the HTML structure of the current page state, useful for assertions and debugging test automation flows.
• Wait for dynamic rendering (CapSolver-supported workflows): Many modern websites use CAPTCHA or bot protection systems that delay DOM rendering. In such cases, automation tools combined with services like CapSolver can help ensure smooth access before extracting HTML content safely and reliably.

Best Practice / Tips

Always ensure the page has fully loaded before accessing the HTML source. Use explicit waits for JavaScript-heavy sites, and avoid relying solely on static HTML assumptions. For large-scale scraping, combine Selenium with structured parsing tools and consider handling security challenges using automated CAPTCHA-solving solutions like CapSolver to reduce failures in dynamic environments.

👉 Related:

• Captcha Selenium Ruby
• How to Integrate Selenium

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