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diff --git a/accessible/tests/mochitest/layout.js b/accessible/tests/mochitest/layout.js
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+++ b/accessible/tests/mochitest/layout.js
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+/**
+ * Tests if the given child and grand child accessibles at the given point are
+ * expected.
+ *
+ * @param aID            [in] accessible identifier
+ * @param aX             [in] x coordinate of the point relative accessible
+ * @param aY             [in] y coordinate of the point relative accessible
+ * @param aChildID       [in] expected child accessible
+ * @param aGrandChildID  [in] expected child accessible
+ */
+function testChildAtPoint(aID, aX, aY, aChildID, aGrandChildID)
+{
+  var child = getChildAtPoint(aID, aX, aY, false);
+  var expectedChild = getAccessible(aChildID);
+
+  var msg = "Wrong direct child accessible at the point (" + aX + ", " + aY +
+    ") of " + prettyName(aID);
+  isObject(child, expectedChild, msg);
+
+  var grandChild = getChildAtPoint(aID, aX, aY, true);
+  var expectedGrandChild = getAccessible(aGrandChildID);
+
+  msg = "Wrong deepest child accessible at the point (" + aX + ", " + aY +
+    ") of " + prettyName(aID);
+  isObject(grandChild, expectedGrandChild, msg);
+}
+
+/**
+ * Test if getChildAtPoint returns the given child and grand child accessibles
+ * at coordinates of child accessible (direct and deep hit test).
+ */
+function hitTest(aContainerID, aChildID, aGrandChildID)
+{
+  var container = getAccessible(aContainerID);
+  var child = getAccessible(aChildID);
+  var grandChild = getAccessible(aGrandChildID);
+
+  var [x, y] = getBoundsForDOMElm(child);
+
+  var actualChild = container.getChildAtPoint(x + 1, y + 1);
+  isObject(actualChild, child,
+           "Wrong direct child of " + prettyName(aContainerID));
+
+  var actualGrandChild = container.getDeepestChildAtPoint(x + 1, y + 1);
+  isObject(actualGrandChild, grandChild,
+           "Wrong deepest child of " + prettyName(aContainerID));
+}
+
+/**
+ * Test if getOffsetAtPoint returns the given text offset at given coordinates.
+ */
+function testOffsetAtPoint(aHyperTextID, aX, aY, aCoordType, aExpectedOffset)
+{
+  var hyperText = getAccessible(aHyperTextID, [nsIAccessibleText]);
+  var offset = hyperText.getOffsetAtPoint(aX, aY, aCoordType);
+  is(offset, aExpectedOffset,
+     "Wrong offset at given point (" + aX + ", " + aY + ") for " +
+     prettyName(aHyperTextID));
+}
+
+/**
+ * Zoom the given document.
+ */
+function zoomDocument(aDocument, aZoom)
+{
+  var docShell = aDocument.defaultView.
+    QueryInterface(Components.interfaces.nsIInterfaceRequestor).
+    getInterface(Components.interfaces.nsIWebNavigation).
+    QueryInterface(Components.interfaces.nsIDocShell);
+  var docViewer = docShell.contentViewer;
+
+  docViewer.fullZoom = aZoom;
+}
+
+/**
+ * Return child accessible at the given point.
+ *
+ * @param aIdentifier        [in] accessible identifier
+ * @param aX                 [in] x coordinate of the point relative accessible
+ * @param aY                 [in] y coordinate of the point relative accessible
+ * @param aFindDeepestChild  [in] points whether deepest or nearest child should
+ *                           be returned
+ * @return                   the child accessible at the given point
+ */
+function getChildAtPoint(aIdentifier, aX, aY, aFindDeepestChild)
+{
+  var acc = getAccessible(aIdentifier);
+  if (!acc)
+    return;
+
+  var [screenX, screenY] = getBoundsForDOMElm(acc.DOMNode);
+
+  var x = screenX + aX;
+  var y = screenY + aY;
+
+  try {
+    if (aFindDeepestChild)
+      return acc.getDeepestChildAtPoint(x, y);
+    return acc.getChildAtPoint(x, y);
+  } catch (e) {  }
+
+  return null;
+}
+
+/**
+ * Test the accessible position.
+ */
+function testPos(aID, aPoint)
+{
+  var [expectedX, expectedY] =
+    (aPoint != undefined) ? aPoint : getBoundsForDOMElm(aID);
+
+  var [x, y] = getBounds(aID);
+  is(x, expectedX, "Wrong x coordinate of " + prettyName(aID));
+  is(y, expectedY, "Wrong y coordinate of " + prettyName(aID));
+}
+
+/**
+ * Test the accessible boundaries.
+ */
+function testBounds(aID, aRect)
+{
+  var [expectedX, expectedY, expectedWidth, expectedHeight] =
+    (aRect != undefined) ? aRect : getBoundsForDOMElm(aID);
+
+  var [x, y, width, height] = getBounds(aID);
+  is(x, expectedX, "Wrong x coordinate of " + prettyName(aID));
+  is(y, expectedY, "Wrong y coordinate of " + prettyName(aID));
+  is(width, expectedWidth, "Wrong width of " + prettyName(aID));
+  is(height, expectedHeight, "Wrong height of " + prettyName(aID));
+}
+
+/**
+ * Test text position at the given offset.
+ */
+function testTextPos(aID, aOffset, aPoint, aCoordOrigin)
+{
+  var [expectedX, expectedY] = aPoint;
+
+  var xObj = {}, yObj = {};
+  var hyperText = getAccessible(aID, [nsIAccessibleText]);
+  hyperText.getCharacterExtents(aOffset, xObj, yObj, {}, {}, aCoordOrigin);
+  is(xObj.value, expectedX,
+     "Wrong x coordinate at offset " + aOffset + " for " + prettyName(aID));
+  ok(yObj.value - expectedY < 2 && expectedY - yObj.value < 2,
+     "Wrong y coordinate at offset " + aOffset + " for " + prettyName(aID) +
+     " - got " + yObj.value + ", expected " + expectedY +
+     "The difference doesn't exceed 1.");
+}
+
+/**
+ * Test text bounds that is enclosed betwene the given offsets.
+ */
+function testTextBounds(aID, aStartOffset, aEndOffset, aRect, aCoordOrigin)
+{
+  var [expectedX, expectedY, expectedWidth, expectedHeight] = aRect;
+
+  var xObj = {}, yObj = {}, widthObj = {}, heightObj = {};
+  var hyperText = getAccessible(aID, [nsIAccessibleText]);
+  hyperText.getRangeExtents(aStartOffset, aEndOffset,
+                            xObj, yObj, widthObj, heightObj, aCoordOrigin);
+  is(xObj.value, expectedX,
+     "Wrong x coordinate of text between offsets (" + aStartOffset + ", " +
+     aEndOffset + ") for " + prettyName(aID));
+  is(yObj.value, expectedY,
+     "Wrong y coordinate of text between offsets (" + aStartOffset + ", " +
+     aEndOffset + ") for " + prettyName(aID));
+
+  var msg = "Wrong width of text between offsets (" + aStartOffset + ", " +
+    aEndOffset + ") for " + prettyName(aID);
+  if (widthObj.value == expectedWidth)
+    ok(true, msg);
+  else
+    todo(false, msg); // fails on some windows machines
+
+  is(heightObj.value, expectedHeight,
+     "Wrong height of text between offsets (" + aStartOffset + ", " +
+     aEndOffset + ") for " + prettyName(aID));
+}
+
+/**
+ * Return the accessible coordinates relative to the screen in device pixels.
+ */
+function getPos(aID)
+{
+  var accessible = getAccessible(aID);
+  var x = {}, y = {};
+  accessible.getBounds(x, y, {}, {});
+  return [x.value, y.value];
+}
+
+/**
+ * Return the accessible coordinates and size relative to the screen in device
+ * pixels.
+ */
+function getBounds(aID)
+{
+  var accessible = getAccessible(aID);
+  var x = {}, y = {}, width = {}, height = {};
+  accessible.getBounds(x, y, width, height);
+  return [x.value, y.value, width.value, height.value];
+}
+
+/**
+ * Return DOM node coordinates relative the screen and its size in device
+ * pixels.
+ */
+function getBoundsForDOMElm(aID)
+{
+  var x = 0, y = 0, width = 0, height = 0;
+
+  var elm = getNode(aID);
+  if (elm.localName == "area") {
+    var mapName = elm.parentNode.getAttribute("name");
+    var selector = "[usemap='#" + mapName + "']";
+    var img = elm.ownerDocument.querySelector(selector);
+
+    var areaCoords = elm.coords.split(",");
+    var areaX = parseInt(areaCoords[0]);
+    var areaY = parseInt(areaCoords[1]);
+    var areaWidth = parseInt(areaCoords[2]) - areaX;
+    var areaHeight = parseInt(areaCoords[3]) - areaY;
+
+    var rect = img.getBoundingClientRect();
+    x = rect.left + areaX;
+    y = rect.top + areaY;
+    width = areaWidth;
+    height = areaHeight;
+  }
+  else {
+    var rect = elm.getBoundingClientRect();
+    x = rect.left;
+    y = rect.top;
+    width = rect.width;
+    height = rect.height;
+  }
+
+  var elmWindow = elm.ownerDocument.defaultView;
+  return CSSToDevicePixels(elmWindow,
+                           x + elmWindow.mozInnerScreenX,
+                           y + elmWindow.mozInnerScreenY,
+                           width,
+                           height);
+}
+
+function CSSToDevicePixels(aWindow, aX, aY, aWidth, aHeight)
+{
+  var winUtil = aWindow.
+    QueryInterface(Components.interfaces.nsIInterfaceRequestor).
+    getInterface(Components.interfaces.nsIDOMWindowUtils);
+
+  var ratio = winUtil.screenPixelsPerCSSPixel;
+
+  // CSS pixels and ratio can be not integer. Device pixels are always integer.
+  // Do our best and hope it works.
+  return [ Math.round(aX * ratio), Math.round(aY * ratio),
+           Math.round(aWidth * ratio), Math.round(aHeight * ratio) ];
+}