setting export options in headline properties

[Matt Price <moptop99@gmail.com>]

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Hi,

I'm not sure if I'm reading the documentation properly, but my
understnading is that I ought to be able to set export options as subtree
properties, and that if I do so, they should be picked up by export engines
when exporting subtrees.  However, that doesn't see to be happening for me,
and from what I can tell, `org-export-get-environment` is not overriding
global values when passed the `subtreep` parameter.

I tried the following with emacs -Q , which seems to confirm my issue. Is
this the expected behaviour, and if so, is there some other way for me to
set subtree-level export options?

--------------
** subtree
:PROPERTIES:
:SUBTITLE: testing
:REVEAL_TITLE_SLIDE: nil
:HTML_CONTAINER: section
:END:


#+begin_src emacs-lisp
(let ((info (org-export-get-environment 'html t)))
  (string-join `(,(plist-get info :subtitle) ,(plist-get info
:html-container)) "\n")
  )
#+end_src

#+RESULTS:
:
: div
--------------------------

thanks as always!

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