Over in Positron, we’ve implemented enough of Electron’s element to run the basic browser app in this collection of Electron sample apps. To try it out:

git clone https://github.com/hokein/electron-sample-apps
git clone https://github.com/mozilla/positron
cd positron
./mach build
./mach run ../electron-sample-apps/webview/browser/

https://mykzilla.org/2016/07/27/a-basic-browser-app-in-positron/