But I didn't say my "solution" was epub2-compliant
For the record, here's the CSS properties supported by the epub2 spec:
https://idpf.org/epub/20/spec/OPS_2....htm#Section3.3
display:inline-block is indeed not there, max/min-width/height are.
So, one thing is ADE-2.x compliance, a quite different thing is epub2 compliance. Of course one could argue that the former more relevant