What’s new in EdgeHTML 13.10586 for developers

The new build of Windows 10 with the number 10586.3 and the designation 1511, Threshold 2, or Fall Update also includes a new rendering engine for Microsoft Edge. Among the significant changes, the support for ams.js, WebRTC and the ever-improving ES6 support stand out. Support for the handy attribute a[download] or CSS value initial has also been added. The new Windows Runtime finally allows the use of Drag & Drop. From HTML, you can now use the element template, meter, picture, or the w unit in the srcset attribute.

HTML

• a[download] attribute
• Extended srcset (sizes)
• input type=datetime-local
• input type=text selectionDirection
• input type=time
• <meter> element
• <picture> element
• SVG external content
• <template> element

JavaScript

• asm.js now enabled by default
• Canvas Blend Modes
• ellipsis in canvas
• Drag & drop for uploading files is now supported
• ES2016 Async Functions (After Enable JavaScript Experimental Features flag)
• ES2015 Classes now enabled by default (previously after flag)
• ES2015 Destructuring now available (after JavaScript Experimental Features)
• ES2016 Exponentiation operator (after the Enable JavaScript Experimental Features flag)
• Event Handler oninvalid
• Pointer Lock (Mouse Lock)
• WebRTC – Object RTC API (desktop)

CSS

• CSS initial and unset values
• CSS Mutability of the pseudo-class (:read-write, :read-only)
• CSS Range of the pseudo-class (:in-range, :out-of-range)

Summary from the changelog.