Lesser known cool features of HTML5
I tried the link on a Mac using OS X 10.6.8 with Firefox 5.0.1 (latest) and I get this quasi-popup error<p>"<a href="https://html5-demos.appspot.com/static/html5-whats-new/slides.js" rel="nofollow">https://html5-demos.appspot.com/static/html5-whats-new/slide...</a> (line 480) : slide.dataset is undefined"