Why no HTML or CSS tags / subjects?

I am brand new to this site and was just exploring through the various programming languages and subject tags.

I found PHP, Javascript and MySQL, as expected, in web development and followed them immediately.

But I was surprised to not find the basic web development languages of HTML and CSS.

Am I truly in the minority of web developers who use the basic languages in addition to, or in my case instead of, the RAD Frameworks?

I think the discussions would be interesting, relevant and helpful if there were HTML and CSS or at the very least HTML5 and CSS3 language subject tags.

Am I alone?