SharePoint Online - Changes to classic user experience (Jan 16, 2016)

We're making some changes to SharePoint Online pages
MC127395
Plan For Change
Published On : January 16, 2018

We're making some changes to SharePoint Online pages running the classic user experience. We're changing the default document mode of all classic pages to be Edge mode, instead of Internet Explorer (IE) 10 mode. This change does not apply to sites that are using custom theming, or sites that have the modern list experience disabled at the site or tenant level.

This change will begin rolling out February 14th, and will complete by the end of February.
How does this affect me?
For most users, this change will just increase performance and reliability of pages. However, some custom master pages or custom web parts may contain custom code that takes a dependency on the older IE10 document mode.
What do I need to do the prepare for this change?
If you have sites with this kind of customization, the sites can be reverted to use the IE10 document mode by doing the following:

1. Open the site in SharePoint Designer.
2. Edit the master page that is in use.
3. Find this line:
<code><SharePoint:IECompatibleMetaTag runat="server" /></code>

And replace it with:
<code><meta http-equiv="X-UA-Compatible" content="IE=10"/></code>

4. Save the page and reload the site.

You can use PowerShell to configure a site to continue to use IE 10 mode even after this change. If desired, you can start preparing your environment today for this change. Please click Additional Information to learn more about how to accomplish this.

Additional information
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About Tom DeMeulenaere

Highly accomplished information technology professional with extensive knowledge in System Center Configuration Manager, Windows Server, SharePoint, and Office 365.
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