presentation (simple-slides?) master-like feature?

[Bruce <bdarcus@gmail.com>]

I've been gravitating to a presentation system where I author
presentations in markdown, and then convert them to an HTML-based
system that results in examples like this:

http://www.users.muohio.edu/darcusb/s6test/test.html

This allows me to focus on content, but very quickly create
high-quality slides.

So I have a kind of default representation of a slide, but I also have
a couple of CSS classes that I attach (via XSLT) to individual slides
depending on the content. For example, if I have a title without any
other text content, then I attach a "title" class to the slide, which
renders the title larger, and vertical-centered on the page. If
there's a single image, I attach a "imgbig" class, which floats the
image to the background, and enlarges it to fill the slide.

I would like to be able to do the same with PDF using ConTeXt, ideally
using simple-slides. I know some styles have similar parameter options
for things like image placement, but I'm not seeing anything
equivalent for titles. Is this possible to add?

Bruce

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