Changes to Default Document Mode in Office 365 / SharePoint Online
Starting February 14th, 2018 – Microsoft will push an update to a tiny, but very important, piece of code in all your master pages. They will be changing the default document model from Internet Explorer 10 mode to IE Edge mode.
This change will be completely rolled out by the end of February.
How will you be impacted?
Some custom web part, master pages, or 3rd parties might rely on the document model as IE=10 compatible.
Known Issues (as of this writing):
- “Open with Explorer” does not work with IE Edge
Steps to take:
If you know you have a custom masterpage and want to continue running in IE=10 compatible mode then you must make the change manually.
Inside the masterpage make the following change:
<!-- comment this out, like so -->
<!-- add this -->
<meta http-equiv="X-UA-Compatible" content="IE=10"/>