Microsoft's New Evergreen Bingbot is now adopting Microsoft Edge as the Bing engine to render web pages and to run JavaScript. Just as a reminder, Microsoft Edge is adopting Chromium open source.
Microsoft Confirms it is Building Microsoft Edge Based Upon Chromium [webmasterworld.com]
Microsoft Edge Preview Based on Chromium in the Dev Channel [webmasterworld.com]

By disclosing our new Bingbot Web Pages rendering technology, we are ensuring fewer SEO compatibility problems moving forward and increase satisfaction in the SEO community.

[blogs.bing.com...]

This is similar to an announcement from Google earlier this year. Evergreen Googlebot Now Runs Latest Chromium Rendering Engine [webmasterworld.com]