Drop the first . in raw.github.com to browse static HTML/CSS/JS files
Just learned about rawgithub.com today. This in an awesome value-add service for public GitHub repos. It looks like a proxy that merely reverts the content type headers for static files served by raw.github.com. Brilliant idea!
To start using it, just drop the first . in the raw.github.com URL to your HTML/JS/CSS files. Too easy.
<center>
</center>
Here's an example of the index.html file from the w3c/aria-in-html repo: