I have some good news and some bad news.
First, the good news is HTML5 includes MathML and has been embraced by all browser vendors.
Now the bad news. MathML support is broken in IE9 and we see no evidence that Microsoft will fix this problem unless they are made to understand how important MathML support is to the STEM and education communities. MathML is also an important key to insuring math accessibility to the blind and sight-impaired, as well as those with certain learning disabilities.
While we applaud Microsoft for promising to support HTML5 with Internet Explorer 9, we hope you will join us in encouraging them to fix the small bug that is currently preventing MathML from working in HTML5 pages. Please publicize the issue with whatever resources you have: personal blogs, tweets, forum posts, comments on other people's blog posts, etc.
Read the whole story: MathML in HTML5: Internet Explorer 9 is Broken.
That's probably a pretty good idea, CB, but we have to do what we can. Many, if not most, of the members of this forum no doubt use Firefox, Safari, or Chrome as their primary browser, but for someone who's blind and needing screen reader software to read the web page aloud, that's not an option if you want the math read aloud. Absolutely the only way to do that is with a page that uses MathML for the math, and Internet Explorer+MathPlayer for the browser. (Well, not literally "absolutely the only way", because images with perfectly descriptive alt text can be read also, but not as well as MathML, and it's certainly a lot easier on the web author to use MathML than it is to write out a usable description for every equation in the web page.)
Also we are not permitted by the IT policy to install unapproved software so in theory we cannot fix this problem ourselves. The only bright spot in this is the ambiguity in what "install" means. I take that to mean that anything that can be run from the run dialog and is not on a local hard drive is not installed.