You’re still waiting for me to explain what I meant when I referred to JavaScript as a last resort. I hinted at it in the preceding paragraph. Not the part on JavaScript debugging, but my reference to CSS and HTML. These do a lot more than paint screens. They are a browser's client-side framework. Everything they do is handled as native code. In other words, they're fast. CSS3 and HTML5 are too inconsistently implemented (if at all) across browsers to design to unless you're specifically targeting Safari, iPhone, or other WebKit-based browsers.