In context: Windows has included a proprietary JavaScript engine since the release of Internet Explorer 3.0 nearly 30 years ago. Technically, JScript is Microsoft's own dialect of the ECMAScript ...

WebUI 2.0 is a new, markup-first architecture designed to simplify the Edge source code structure, minimizing the amount of JavaScript code running during the UI initialization path.

From December, Microsoft Edge’s settings page is going to be more responsive. It’s the latest of Edge’s components ported by Microsoft to its new WebUI 2.0 toolkit.

Microsoft is deprecating Defender Application Guard (including the Windows Isolated App Launcher APIs) for Edge for Business users.