Which browsers still support CSS expressions

Question

From a blog:

The basic idea with CSS expressions is that you will have calculation and dynamic values for properties in the CSS code, something

Answer 1

AFAIK, it was only ever IE6/7 (maybe) 5.

I never thought they were a good thing. May as well just use JavaScript directly.

They are in fact implemented in JavaScript, and I'm pretty sure disabling JS disables these expressions.

The sample you posted...

width: expression(document.body.clientWidth >  1100)? "1100px" : "auto";

...is just a ternary operator that says If the width is larger than 1100px, set it 1100px, otherwise set property to auto.

To finish, no scripting language on the web is more widely supported than JavaScript.