"Bing has announced support for HTML5 pushState as a way to implement AJAX on a site in a way that enables Bing to crawl and index the URLs and content. As Google has supported this implementation since early 2012, site owners finally have an AJAX option that can be crawled and indexed by both major search engines."
glad to learn pushState is supported by both Google and Bing as it is the simplest way to implement SEO-friendly Ajax!