gecko/layout/xul/base/test/window_resizer.xul

<?xml-stylesheet href="chrome://global/skin" type="text/css"?>
<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
    screenX="200" screenY="200" width="300" height="300"
	onload="setTimeout(doTest, 0)">
<script type="application/javascript" src="/tests/SimpleTest/EventUtils.js"></script>
<script><![CDATA[
var is = window.opener.SimpleTest.is;

function doTest() {
  // from test_resizer.xul
  var expectX = 200;
  var expectY = 200;
  var expectXMost = 500;
  var expectYMost = 500;
  var screenScale = expectX/window.screenX;
  var root = document.documentElement;

  var oldScreenX = window.screenX;
  var oldScreenY = window.screenY;
  var oldWidth = window.outerWidth;
  var oldHeight = window.outerHeight;

  function testResizer(dx, dy) {
    var offset = 20;
    var scale = 5;
    // target the centre of the resizer
    var offsetX = window.innerWidth/2 + (window.innerWidth/3)*dx;
    var offsetY = window.innerHeight/2 + (window.innerHeight/3)*dy;

    for (var mouseX = -1; mouseX <= 1; ++mouseX) {
      for (var mouseY = -1; mouseY <= 1; ++mouseY) {
        var newExpectX = expectX;
        var newExpectXMost = expectXMost;
        var newExpectY = expectY;
        var newExpectYMost = expectYMost;
        if (dx < 0) {
          newExpectX += mouseX*scale;
        } else if (dx > 0) {
          newExpectXMost += mouseX*scale;
        }
        if (dy < 0) {
          newExpectY += mouseY*scale;
        } else if (dy > 0) {
          newExpectYMost += mouseY*scale;
        }

        synthesizeMouse(root, offsetX, offsetY, { type:"mousedown" });
        synthesizeMouse(root, offsetX + mouseX*scale, offsetY + mouseY*scale, { type:"mousemove" });
        if (window instanceof Components.interfaces.nsIDOMChromeWindow) {
          is(window.screenX*screenScale, newExpectX,
             "Bad x for " + dx + "," + dy + " moving " + mouseX + "," + mouseY);
          is(window.screenY*screenScale, newExpectY,
             "Bad y for " + dx + "," + dy + " moving " + mouseX + "," + mouseY);
          is(window.outerWidth, newExpectXMost - newExpectX,
             "Bad width for " + dx + "," + dy + " moving " + mouseX + "," + mouseY);
          is(window.outerHeight, newExpectYMost - newExpectY,
             "Bad height for " + dx + "," + dy + " moving " + mouseX + "," + mouseY);
        }
        else {
          is(window.screenX, oldScreenX, "window not moved for non-chrome window screenX");
          is(window.screenY, oldScreenY, "window not moved for non-chrome window screenY");
          is(window.outerWidth, oldWidth, "window not moved for non-chrome window outerWidth");
          is(window.outerHeight, oldHeight, "window not moved for non-chrome window outerHeight");
        }

        // move it back before we release! Adjust for any window movement
        synthesizeMouse(root, offsetX - (newExpectX - expectX),
                              offsetY - (newExpectY - expectY), { type:"mousemove" });
        synthesizeMouse(root, offsetX, offsetY, { type:"mouseup" });
      }
    }
  }

  function testElementResizer()
  {
    var resizers = document.getElementsByTagName("resizer");
    for (var r = 0; r < resizers.length; r++) {
      resizers.setAttribute("element", "container");
    }
  }

  testResizer(-1, -1);
  testResizer(-1, 0);
  testResizer(-1, 1);
  testResizer(0, -1);
  testResizer(0, 1);
  testResizer(1, -1);
  testResizer(1, 0);
  testResizer(1, 1);
  window.close();
  window.opener.nextResizerTest();
}
]]></script>
	<hbox flex="1">
		<vbox flex="1">
			<resizer dir="topleft" flex="1"/>
			<resizer dir="left" flex="1"/>
			<resizer dir="bottomleft" flex="1"/>
		</vbox>
		<vbox flex="1">
			<resizer dir="top" flex="1"/>
			<hbox flex="1"/>
			<resizer dir="bottom" flex="1"/>
		</vbox>
		<vbox flex="1">
			<resizer dir="topright" flex="1"/>
			<resizer dir="right" flex="1"/>
			<resizer dir="bottomright" flex="1"/>
		</vbox>
	</hbox>
</window>