If anyone's interested, there's a new working version of
org-html-slideshow that's compatible with org-mode 9.x available here:
https://github.com/aiba/org-html-slideshow.

On Mon, Mar 6, 2017 at 10:04 AM, Peter Salazar <cycleofsong@gmail.com>
wrote:

> Hi everyone,
>
> I've been using the excellent org-html-slideshow (
> https://github.com/relevance/org-html-slideshow) to generate HTML slides
> from org-mode, and it's been working well for me for years.
>
> It generates HTML slides from org-mode using the org-mode heading
> hierarchy. Tag any heading with the org-tag :slide: and that heading and
> its contents automatically become their own slide once you export to HTML
> using org-export-dispatch.
>
> I prefer org-html-slideshow to org-reveal since it allows me the ability
> to easily customize the look and feel of slides—by creating a custom
> slide—simply by adding an org-tag. So if I tag an org-heading with the tag
> :fullscreenslide: for example (so that the heading looks like * Heading
> :slide:fullscreenslide:), it will then export that slide to HTML with
> class="fullscreenslide" — and I can then use CSS to customize the look and
> feel of all slides with that class.
>
> Org-html-slideshow also offers a great Presenter View, which opens in a
> separate tab in your browser, and displays your speaker notes, the current
> slide, and the next slide. Unfortunately, org-html-slideshow is no longer
> being actively developed, and a recent update to org-mode has broken the
> way Presenter View functions. Somehow with the new org-mode updates, the
> "next slide" view in Presenter Notes mode no longer advances correctly. The
> "next slide" slide gets stuck in a loop of 4-5 slides, and just repeats
> those few slides. It does not reliably show you what the next slide is
> going to be.
>
> I notice that the output from example.org when I export to HTML is fairly
> different from the example.html that's in the repo. Something in those
> differences is breaking the ability of Presenter Notes to advance to the
> next slide:
> https://gist.github.com/incandescentman/dca040c750a3e9e7e687942d69ebd53f
>
> Anyone else using org-html-slideshow? Does anyone have any thoughts on how
> to get this working again? Thanks!
>