Doesn't work with RevealJS HTML Backend

[shivams]

I am using it as follows

#+begin_parallel
[[color:orange][Are you excited to learn some Lisp?]] [[blue:Yes!]]

Pop-quiz: How does doc:apply work?
#+end_parallel

In the HMTL backend,

it works fine.

However, when I export it to revealJS HTML

Using the org-reveal package, the generated HTML doesn't reflect the different columns as it does in plain HTML. As I inspect the generated HTML using the reveal backend, it has no special CSS inserted as it had in the plain HTML backend.

Please tick the following, by replacing [ ] with [X]

1. I am aware of the extensive documentation at http://alhassy.com/org-special-block-extras/
2. I have read the documentation of doc:org-defblock
3. I have checked some boxes without reading them.
4. I am aware that (org-defblock X ⋯) gives me a Lisp function org-block/X
   that I can play with; e.g., C-h o org-block/shout shows a function with its
   docstring and arguments. We can press C-u C-x C-e at the end of the
   closing parens of (org-block/shout 'html "*Hello*, /world/!") to see
   what Org sees when it rewrites a shout block with the given string as its contents.

[suhail-singh]

This is because org-special-block-extras hardcodes backend checks based on
strict equality (e.g. using (equal backend 'html) or (equal backend 'latex))
instead of using org-export-derived-backend-p from 'ox.

Perhaps @alhassy will have time to either fix it or review a patch that fixes
it.