Collective action and old IE
As of January 12, 2016, Microsoft no longer supports Internet Explorer 8, 9 and 10. From here on out, they will only provide security fixes for IE 11 and Edge.
For many front-end developers, this was a cause for celebration: we no longer need to provide fallbacks for browser features not supported in old IE! Being able to use Flexbox without float fallbacks comes to mind, as does not needing to worry about media query support in IE 8.