Controling structure with CSS

Hi,

a quick question: would it make sense to allow authors to rearrange the 
structure of a document wit CSS?

Something like:

   .icon {
     source-order: -1;
   }

   <h1>Foo Bar<h1>
   <span class="icon">(Question)</span>

Should be displayed as:

    (Question)

    Foo Bar

(Bad example, I know :/ I hope you understand what I mean.)

Just an idea.

Tonico