"New" means it can't already have had over 2% market share prior to me posting this question (2023), which excludes:

• Chromium

• WebKit (Safari)

• Gecko (Firefox)

• Trident (Internet Explorer)

If it's forked from one of the above, the base code must be from 2013 or earlier.

Question inspired by this post

https://drewdevault.com/2020/03/18/Reckless-limitless-scope.html