Display: flex not working

[lllopo]

There was an issue with display: inline-* that I see fixed, but pretty much the same goes for display: flex. It gets replaced with display: block and this leads to wrong height.
Both lines :
if (display !== 'inline-block' && display !== 'inline-flex')
should become
if (display !== 'inline-block' && display !== 'flex' && display !== 'inline-flex')

[liabru]

Can you provide an example case like in #68 so I can add it to the test page? Thanks.