Sorry about that. We are strongly opinionated, since we have been developing with IE support since version 5.5 (that we don't miss much, truth be told).

The course has an entire module dedicated to make things work in IE: http://html5.instructormatters.com/0.3/browsers-and-seo.html...

You are right that IE10 is a standards-compliant, really good browser (not so much IE9). We were rushing to get the contents out and probably should re-check our browser assumptions.

Thanks for the heads-up.