[evanmoran]

I think this great advice for teaching, but I'd stress that Javascript should be included as well.

HTML and CSS are great for learning because everything they change will adjust the webpage instantly. This is the web's biggest teaching advantage: insanely fast iteration time. To folks learning this speed feels like a super power. (And when they try iOS/Android programming, they will miss it)

Where Javascript comes in, is it helps tie that fast iteration into a place where variables and functions can exist. Functions are especially hard to grasp, so starting those pretty early matters a lot. Simply put: if you don't understand functions, then all the HTML/CSS in the world won't save you!