## What is the Ajax crawling scheme specification? ### How does the Ajax crawling scheme work? When a page depends on JavaScript to be rendered and properly indexed, a special tag `` is added in the of the page. When a bot detects the presence of this tag in a page, it requests the same URL by appending the query parameter the [`_escaped_fragment_=`](/content/faq/what-is-the-escaped-fragment-parameter/index.html) to retrieve the corresponding snapshot. This behavior has been officially **[deprecated](https://webmasters.googleblog.com/2015/10/deprecating-our-ajax-crawling-scheme.html)**. Today, it is recommended to make sure your site implements a new recommendation called "[Dynamic Rendering](/content/faq/what-is-dynamic-rendering/index.html)". If you have questions or comments about this FAQ, please contact us by [email](mailto:contact@seo4ajax.com).