New in Chrome 73: Desktop PWAs, Signed HTTP Exchanges and Constructable Style Sheets
Channel: Chrome for Developers
Date: 2019-03-12

Chrome 73 makes creating portable content easier with signed HTTP exchanges. Dynamically changing styles becomes way easier with constructable style sheets. And adds support for Progressive Web Apps on Mac, bringing support for PWAs to all desktop and mobile platforms, making it easy to create installable apps, delivered through the web.

Check out https://developers.google.com/web/updates/2019/03/nic73 for all of the details  including links to docs, specs and samples.