What is the Ajax crawling scheme specification?
What bots support the Ajax crawling scheme?
Today, the Ajax crawling scheme specification is still supported by Google, Bing and Yandex. Some social networks like Facebook or Twitter are also compatible with a part of this specification (i.e. sites using #! paths).
If you need to render your website for search engine and social network bots, it is highly recommended to implement the new recommendation called "Dynamic Rendering". This recommendation does not have the disadvantages of the Ajax crawling scheme specification and is compatible with all bots.