@document support

[iamnewton]

@document 
  /* Rules for a specific page */
  url(http://css-tricks.com/),

  /* Rules for pages with a URL that begin with... */
  url-prefix(http://css-tricks.com/snippets/),

  /* Rules for any page hosted on a domain */
  domain(css-tricks.com),

  /* Rules for all secure pages */
  regexp("https:.*")
{

  /* Start styling */
  body { font-family: Comic Sans; }

}

Source