How to only show certain parts with CSS for Print?

Question

I have a page with lots of data, tables and content. I want to make a print version that will only display very few selected things.

Instead of writing another page

Answer 1

Start here. But basically what you are thinking is the correct approach.

Thanks, Now my question is actually becoming: How do I apply CSS to a class AND ALL OF ITS DESCENDANT ELEMENTS? So that I can apply "display:block" to whatever is in the "printable" zones.

If an element is set to display:none; all its children will be hidden as well. But in any case. If you want a style to apply to all children of something else, you do the following:

.printable * {
   display: block;
}

That would apply the style to all children of the "printable" zone.