IE11 mr-auto in flexbox buggy

Created by: BlackDark

The mr-auto class for example moving a button to left side of a flex container is not working correctly. Even the official website http://v4-alpha.getbootstrap.com/utilities/flexbox/#with-justify-content has this problem (see above screenshot).

OS:

• Windows 7
• IE11 (11.0.9600.18792)