Name of HTML+CSS "markup" framework

Some time ago I remember having seen example code of a HTML markup language, which is able to spit out HTML+CSS based on a textual description of a website layout. It's basically "componentified" HTML.

It would look like this:

Menu
    Item1(x=1)
    Item2(x=2)
AlertMessage
    "Bla di bla di bla bla bla"
Picture(x=blabla)

and would output HTML (and possible CSS) based whatever implementation you'd pick.

<div>
    <ul class="menu_x">
        <li data-x=1>X</li>
    </ul>
</div> ....

But I completely forgot the name and am unable to find anything on the web. (Close to the point where I am developing something like this myself).

Any bells ringing?