Add MathML/Firefox/XHTML/Slidy note to presentations post.

diff --git a/posts/Presentations.mdwn b/posts/Presentations.mdwn
index 619d99265561e745ddfecac26e1ba367bb0b458d..df41c3cd2a90c92eab022e20cb184482c5dbf640 100644 (file)
--- a/posts/Presentations.mdwn
+++ b/posts/Presentations.mdwn
@@ -23,7 +23,9 @@ options][pointers].
 Personally, I'm going to go with [S6][], since the project uses Git
 for version control which is a *Good Thing*.  There's also [S9][],
 which lets you build S6 presentations with some sort of wiki-syntax
-instead of HTML, if that's appealing to you.
+instead of HTML, if that's appealing to you.  If you need MathML on
+Firefoxes before version 4 (which includes HTML 5 support), you'll
+need a framework like Slidy that supports XHTML.
 
 Finally, there's a [webslideshow][] Google group that tracks
 developments in this area.