Due to the change in 50be048ad0cbe0e9150ca2351b894b041ae7cf49, image
display specifications like
#+attr_org: 300px
don't work. From the commit message, it looks like the intent was to
ignore specifications like :width 4in. I'm not sure if ignoring "px"
specifications was intentional.
If this is not a bug and width should be specified as an integer
(i.e. 300 instead of 300px), then the manual needs to be updated.
In (info "(org) Images") I still see examples like
#+ATTR_HTML: :width 300px
-Karthik
