css transitions - Backface-Visibility Not Working Properly in Firefox (Works in Safari)

Question

I'm having a problem with the back face-visibilty property. It works how I want it to in Safari/Chrome, but for some reason it's not working correctly in Firefox.

When the box flips, I get a mirror image of the front face.

Answer 1

This bug has been acknowledged by Mozilla.

The fix is to add transform: rotateX(0deg) to the front and back objects.

Adding backface-visiblity:hidden on the container, as suggested by @yalia, makes the back unresponsive in Chrome, hence that fix should be avoided.

Here's a fiddle with the fix.

Answer 2

To fix: - Verified!

Add to both object:

transform: rotateX(0deg)

to the FRONT and BACK objects.