In a small startup, I couldn't imagine hiring someone with just HTML and CSS. Money tends to be to scarce to pay someone with such few skills a decent wage.
If you got to a huge company, say hundreds of developers - you might see it go the other way - so many people have HTML and CSS in addition to JS, any number of frameworks or backend languages that they might say, why even bother hiring someone with just HTML / CSS.
IE: knowing HTML and CSS have become almost trivial. It's par for the course - you must know it, in addition to whatever else you specialize in.
Director of User Experience Development