Please see the very beginning of ORG-NEWS/Release Notes

- http://orgmode.org/cgit.cgi/org-mode.git/tree/etc/ORG-NEWS?h=maint#n26
- http://orgmode.org/Changes.html#orgf3f9c91

On Mon, Nov 7, 2016 at 6:25 PM Peter Salazar <cycleofsong@gmail.com> wrote:

> Since upgrading to org-mode 9.0, I am unable to export HTML blocks. When I
> export to HTML, the contents of HTML blocks export literally, rather than
> as rendered HTML.
>
> So for instance, I have an org-mode file containing this:
>
> #+BEGIN_HTML
> <A HREF="http://orgmode.org">link</a>
> #+END_HTML
>
> When I export to HTML, I get an HTML file that has the literal text "<A
> HREF="http://orgmode.org">link</a>" rather than creating a hyperlink.
>
> Is there a fix for this? Thanks!
>
-- 

Kaushal Modi