Windows 10 Build 14316: A lot of improvements in the Edge browser

New JavaScript Features

Experimental JavaScript Features (enabled by about:flags) ES6 Regex symbols New Web Platform Features: Opus Audio Format Time Element Data Element Output Element Input type = color
Canvas Path2D objects Web Speech API (Synthesis) Fetch API experimental support (enabled at about:flags) Web Notifications API Lab Support (enabled at about:flags)

New Web Platform Features: Drag and Drop Folders: In Edge, users can drag and drop uploaded folders to sites like OneDrive, Dropbox, and Google Drive.
Provides better tab operations for mobile devices: On the phone, Microsoft Edge gives you more control over the tabs. Better copy/paste operations on mobile phones: On mobile devices, we have improved copy and paste operations. Better Favorites import experience: You can now import your favorite content from Firefox as well as Chrome and IE. Favorites tree view: In the Hub, you can organize your favorites in a tree view. Download Tip: When you close the Edge browser, there are ongoing downloads that will give you a download prompt. Default save location: You can now set the download file save location by default.

Windows 10 Build 14316 brings a number of improvements to Edge, and network notifications and the new F12 Developer Tools Access Tree are one of the main features.