https://www.theregister.co.uk/2020/01/24/microsoft_kills_catnip_pwa/

Microsoft ended the week with a fresh build of Windows 10 and, slightly worryingly, the killing of a Progressive Web App (PWA) project "due to some technical limitations."

Pushed to the Fast Ring of the Windows Insider Program, Build 19551 would frankly be a big ol' bag of "meh" if it weren't for the cancelling of Project Catnip.