I feel like a dinosaur.
About flexbox heard a year ago, with comments that while it is not all supported, not began to experiment.
By the way the link under the float elements just flexbox, and the link under flexbox code without edits :)
Here only doubts I have about the float, in the same units neponyatki with the definition of height nachinautsa, respectively, the parent will not play as needed...
At least so I was, and it was originally done in float, then converted to inline-block