{text-indent : -9999} for image replace not working

Answer 1

In my case text indent was not working on H1 because of :before pseudo tag I used to correct a fixed header positioning problem

.textpane h1:before, .textpane h2:before, .textpane h3:before {
  display:block;
  content:"";
  height:90px;
  margin:-90px 0 0;
}

This applied to H1 elements with negative indent hack showed text on top of the images in FF & Opera