WebView Control

IE 11

At the moment Office Add-ins are running in IE11.
IE11 does not support ES 2016.
Office add-ins are run inside a web control that is built-in to the operating system and browser.

PlatformWeb Control
WindowsIE11 / Trident
MacWebKit 2
iOSWebKit 2
OnlineBrowser (Edge, Chrome, Firefox, Safari)

Edge WebView

This is available on Windows 10.
Supports all HTML5 features.
Support for ES 2016 and above.

Windows 10 version 19XX and Office 16.0.11326.2000 + will default to using the new Edge WebView control

Originally available to Office Insiders and Windows Insiders.
Publicly available from April / May 2019.

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