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.
|Windows||IE11 / Trident|
|Online||Browser (Edge, Chrome, Firefox, Safari)|
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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