Why, exactly, should it demonstrate proper HTML?
The POINT is the glow. That the glow works on a form is by happenstance, I'd suppose, as that was the original inspiration. Regardless, it could be a glow behind a blank div and I'd be equally impressed.
The nit that you're picking is akin to tasting someone's new gumbo recipe, and complaining that they didn't use the good china.
