head+body ("Head Adjacent Sibling Body") CSS Filter

If the background color of this paragraph is green (a darker green than this page's background) then the hack was applied.

Example Code

p.test {
  background-color: #f66;
  color: #000;

head+body p.test {
  color: #000;
  background-color: #6f6;

List of browsers that apply this

List of browsers that do not apply this

Note: IE4.0/Win and IE5.0/Win will apply this if there is a space on the left side of the adjacent sibling selector (+).