[pritambarhate]

This depends on flexbox. As per CanIUse flexBox is fully supported only on Android 4.4 and above.

However as per:

https://developer.android.com/about/dashboards/index.html

More than 20% "active" Android devices out there still don't support flexbox. So unless you are targeting websites only for high end device owners, flexbox only is still not an option.

Edit: Posted it too fast! On CanIUse I checked support for Android Browser. However Google Chrome for Android is supported on 4.1 and above. So most likely many Android users running Android 4.1 to 4.3 may be using Google Chrome. However it's hard to know how many.

[skrebbel]

Also IE9, which is used by many people, especially at work, who's computers are stuck on Windows 7.

[ergo14]

All browsers lower than IE11 are NOT supported by microsoft and are a security risk. People should not support them, a lot of websites like youtube and others will not really function correctly in them.

[carc1n0gen]

This is targeting mobile specifically