When you input Japanese characters on a contentEditable element by using Japanese Input Method Editor (IME), the caret may jump to an incorrect place, or a composition string may disappear.
When you input Korean (Hangul) characters on a contentEditable element by using Korean IME, a composition string may be committed unexpectedly.
When you input characters on a contentEditable element through text suggestion of the touch keyboard, the font style may not be applied correctly.
To fix this issue, install the most recent cumulative security update for Internet Explorer. To do this, go to Microsoft Update. Additionally, see the technical information about the most recent cumulative security update for Internet Explorer.
Note This update was first included in the MS16-142: Security update for Internet Explorer: November 2016.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Learn about the terminology that Microsoft uses to describe software updates.