The original HTML5 brand and corresponding logo was meant to encompass HTML5 plus CSS, SVG, WOFF, and others. Because the brand covered more than its namesake, there was some controversy among web designer and developers. Those against HTML5 being all-inclusive were web designers and developers who felt that the brand and logo were “blurring the lines between separate technologies” that were already being bundled together and mixed up.
I’d have to agree on this one. As a novice web designer and developer (and I’m using those titles very loosely), I know first-hand that HTML5 is already a pretty complex concept and field. Adding more technologies under its umbrella makes it that much more confusing. Today, I think HTML5 is more clearly defined as just that—the latest version of hyper text markup language—which works for me.