gecko-dev/layout/style/ImageDocument.css

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/*
 * This CSS stylesheet defines the rules to be applied to any ImageDocuments,
 * including those in frames.
*/

@media not print {
  .overflowingVertical, .overflowingHorizontalOnly {
    cursor: zoom-out;
  }

  .shrinkToFit {
    cursor: zoom-in;
  }
}

@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;
  }
}