gecko/toolkit/content/widgets/resizer.xml

<?xml version="1.0"?>
<!-- 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/. -->


<bindings id="resizerBindings"
   xmlns="http://www.mozilla.org/xbl">

  <binding id="resizer">
    <resources>
      <stylesheet src="chrome://global/skin/resizer.css"/>
    </resources>
    <implementation>
      <constructor>
      <![CDATA[
        // don't do this for viewport resizers; causes a crash related to
        // bugs 563665 and 581536 otherwise
        if (this.parentNode == this.ownerDocument.documentElement)
          return;

        // if the direction is rtl, set the rtl attribute so that the
        // stylesheet can use this to make the cursor appear properly
        var cs = window.getComputedStyle(this, "");
        if (cs.writingMode === undefined || cs.writingMode == "horizontal-tb") {;
          if (cs.direction == "rtl") {
            this.setAttribute("rtl", "true");
          }
        } else {
          if (cs.writingMode == "vertical-rl") {
            this.setAttribute("rtl", "true");
          }
        }
      ]]>
      </constructor>
    </implementation>
  </binding>

</bindings>