UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:57.0) Gecko/20100101 Firefox/57.0

Steps to reproduce the problem:
The overflow-block and overflow-inline media queries from Media queries level 4 let people tell apart media that paginate vs media that scroll or media that clip using media features instead of media types.

That way, you can do

@media (overflow-block: paged) {
  /* do something smart for pagination */
}

and that will do the right thing when printing AND in ebook readers that paginate instead of scrolling, instead of 

@media print {
  /* do something smart for pagination */
}

which would work on print but fail in ebook readers.

The specification is over here:
https://drafts.csswg.org/mediaqueries-4/#mf-overflow-block
https://drafts.csswg.org/mediaqueries-4/#mf-overflow-inline

What is the expected behavior?

What went wrong?

Did this work before? No 

Does this work in other browsers? N/A

Chrome version: <Copy from: 'about:version'>  Channel: n/a
OS Version: OS X 10.12
Flash Version: