gecko/layout/style/TopLevelImageDocument.css

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 * Contributor(s):
 *   Carlo Alberto Ferraris <cafxx@strayorange.com>
 *   Jared Wein <jwein@mozilla.com>
 *
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/*
  This CSS stylesheet defines the rules to be applied to ImageDocuments that
  are top level (e.g. not iframes).
*/

@media not print {
  body {
    margin: 0;
  }

  img {
    text-align: center;
    position: absolute;
    margin: auto;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
  }
}

@media print {
  /* We must declare the image as a block element. If we stay as
  an inline element, our parent LineBox will be inline too and
  ignore the available height during reflow.
  This is bad during printing, it means tall image frames won't know
  the size of the paper and cannot break into continuations along
  multiple pages. */
  img {
    display: block;
  }
}