[css3-page] feedback

Dear CSS3 team members,

could anyone point me to working example of CSS Paged Media module
usage, which renders page numbers on printed PDF? No matter which
browser I use, it seems that this doesn't work at all. Following
snippet from your specification won't even go through CSS3 validator:

@page :first {
  color: green;

  @top-left {
    content: "foo";
    color: blue;
  }
  @top-right {
    content: "bar";
  }
}

Seems like @top-xxx directives are not allowed inside the @page element.

Best regards,
Łukasz