Add m-esr52 at 52.6.0

1 files changed, 952 insertions, 0 deletions

diff --git a/accessible/tests/mochitest/common.js b/accessible/tests/mochitest/common.js
new file mode 100644
index 000000000..1e48fa067
--- /dev/null
+++ b/accessible/tests/mochitest/common.js
@@ -0,0 +1,952 @@
+////////////////////////////////////////////////////////////////////////////////
+// Interfaces
+
+const nsIAccessibilityService = Components.interfaces.nsIAccessibilityService;
+
+const nsIAccessibleEvent = Components.interfaces.nsIAccessibleEvent;
+const nsIAccessibleStateChangeEvent =
+  Components.interfaces.nsIAccessibleStateChangeEvent;
+const nsIAccessibleCaretMoveEvent =
+  Components.interfaces.nsIAccessibleCaretMoveEvent;
+const nsIAccessibleTextChangeEvent =
+  Components.interfaces.nsIAccessibleTextChangeEvent;
+const nsIAccessibleVirtualCursorChangeEvent =
+  Components.interfaces.nsIAccessibleVirtualCursorChangeEvent;
+const nsIAccessibleObjectAttributeChangedEvent =
+  Components.interfaces.nsIAccessibleObjectAttributeChangedEvent;
+
+const nsIAccessibleStates = Components.interfaces.nsIAccessibleStates;
+const nsIAccessibleRole = Components.interfaces.nsIAccessibleRole;
+const nsIAccessibleScrollType = Components.interfaces.nsIAccessibleScrollType;
+const nsIAccessibleCoordinateType = Components.interfaces.nsIAccessibleCoordinateType;
+
+const nsIAccessibleRelation = Components.interfaces.nsIAccessibleRelation;
+const nsIAccessibleTextRange = Components.interfaces.nsIAccessibleTextRange;
+
+const nsIAccessible = Components.interfaces.nsIAccessible;
+
+const nsIAccessibleDocument = Components.interfaces.nsIAccessibleDocument;
+const nsIAccessibleApplication = Components.interfaces.nsIAccessibleApplication;
+
+const nsIAccessibleText = Components.interfaces.nsIAccessibleText;
+const nsIAccessibleEditableText = Components.interfaces.nsIAccessibleEditableText;
+
+const nsIAccessibleHyperLink = Components.interfaces.nsIAccessibleHyperLink;
+const nsIAccessibleHyperText = Components.interfaces.nsIAccessibleHyperText;
+
+const nsIAccessibleImage = Components.interfaces.nsIAccessibleImage;
+const nsIAccessiblePivot = Components.interfaces.nsIAccessiblePivot;
+const nsIAccessibleSelectable = Components.interfaces.nsIAccessibleSelectable;
+const nsIAccessibleTable = Components.interfaces.nsIAccessibleTable;
+const nsIAccessibleTableCell = Components.interfaces.nsIAccessibleTableCell;
+const nsIAccessibleTraversalRule = Components.interfaces.nsIAccessibleTraversalRule;
+const nsIAccessibleValue = Components.interfaces.nsIAccessibleValue;
+
+const nsIObserverService = Components.interfaces.nsIObserverService;
+
+const nsIDOMDocument = Components.interfaces.nsIDOMDocument;
+const nsIDOMEvent = Components.interfaces.nsIDOMEvent;
+const nsIDOMHTMLDocument = Components.interfaces.nsIDOMHTMLDocument;
+const nsIDOMNode = Components.interfaces.nsIDOMNode;
+const nsIDOMHTMLElement = Components.interfaces.nsIDOMHTMLElement;
+const nsIDOMWindow = Components.interfaces.nsIDOMWindow;
+const nsIDOMXULElement = Components.interfaces.nsIDOMXULElement;
+
+const nsIPropertyElement = Components.interfaces.nsIPropertyElement;
+
+////////////////////////////////////////////////////////////////////////////////
+// OS detect
+
+const MAC = (navigator.platform.indexOf("Mac") != -1);
+const LINUX = (navigator.platform.indexOf("Linux") != -1);
+const SOLARIS = (navigator.platform.indexOf("SunOS") != -1);
+const WIN = (navigator.platform.indexOf("Win") != -1);
+
+////////////////////////////////////////////////////////////////////////////////
+// Application detect
+// Firefox is assumed by default.
+
+const SEAMONKEY = navigator.userAgent.match(/ SeaMonkey\//);
+
+////////////////////////////////////////////////////////////////////////////////
+// Accessible general
+
+const STATE_BUSY = nsIAccessibleStates.STATE_BUSY;
+
+const SCROLL_TYPE_ANYWHERE = nsIAccessibleScrollType.SCROLL_TYPE_ANYWHERE;
+
+const COORDTYPE_SCREEN_RELATIVE = nsIAccessibleCoordinateType.COORDTYPE_SCREEN_RELATIVE;
+const COORDTYPE_WINDOW_RELATIVE = nsIAccessibleCoordinateType.COORDTYPE_WINDOW_RELATIVE;
+const COORDTYPE_PARENT_RELATIVE = nsIAccessibleCoordinateType.COORDTYPE_PARENT_RELATIVE;
+
+const kEmbedChar = String.fromCharCode(0xfffc);
+
+const kDiscBulletChar = String.fromCharCode(0x2022);
+const kDiscBulletText = kDiscBulletChar + " ";
+const kCircleBulletText = String.fromCharCode(0x25e6) + " ";
+const kSquareBulletText = String.fromCharCode(0x25fe) + " ";
+
+const MAX_TRIM_LENGTH = 100;
+
+/**
+ * Services to determine if e10s is enabled.
+ */
+Components.utils.import('resource://gre/modules/Services.jsm');
+
+/**
+ * nsIAccessibilityService service.
+ */
+var gAccService = Components.classes["@mozilla.org/accessibilityService;1"].
+  getService(nsIAccessibilityService);
+
+/**
+ * Enable/disable logging.
+ */
+function enableLogging(aModules)
+{
+  gAccService.setLogging(aModules);
+}
+function disableLogging()
+{
+  gAccService.setLogging("");
+}
+function isLogged(aModule)
+{
+  return gAccService.isLogged(aModule);
+}
+
+/**
+ * Dumps the accessible tree into console.
+ */
+function dumpTree(aId, aMsg)
+{
+  function dumpTreeIntl(acc, indent)
+  {
+    dump(indent + prettyName(acc) + "\n");
+
+    var children = acc.children;
+    for (var i = 0; i < children.length; i++) {
+      var child = children.queryElementAt(i, nsIAccessible);
+      dumpTreeIntl(child, indent + "  ");
+    }
+  }
+
+  function dumpDOMTreeIntl(node, indent)
+  {
+    dump(indent + prettyName(node) + "\n");
+
+    var children = node.childNodes;
+    for (var i = 0; i < children.length; i++) {
+      var child = children.item(i);
+      dumpDOMTreeIntl(child, indent + "  ");
+    }
+  }
+
+  dump(aMsg + "\n");
+  var root = getAccessible(aId);
+  dumpTreeIntl(root, "  ");
+
+  dump("DOM tree:\n");
+  dumpDOMTreeIntl(getNode(aId), "  ");
+}
+
+/**
+ * Invokes the given function when document is loaded and focused. Preferable
+ * to mochitests 'addLoadEvent' function -- additionally ensures state of the
+ * document accessible is not busy.
+ *
+ * @param aFunc  the function to invoke
+ */
+function addA11yLoadEvent(aFunc, aWindow)
+{
+  function waitForDocLoad()
+  {
+    window.setTimeout(
+      function()
+      {
+        var targetDocument = aWindow ? aWindow.document : document;
+        var accDoc = getAccessible(targetDocument);
+        var state = {};
+        accDoc.getState(state, {});
+        if (state.value & STATE_BUSY)
+          return waitForDocLoad();
+
+        window.setTimeout(aFunc, 0);
+      },
+      0
+    );
+  }
+
+  SimpleTest.waitForFocus(waitForDocLoad, aWindow);
+}
+
+/**
+ * Analogy of SimpleTest.is function used to compare objects.
+ */
+function isObject(aObj, aExpectedObj, aMsg)
+{
+  if (aObj == aExpectedObj) {
+    ok(true, aMsg);
+    return;
+  }
+
+  ok(false,
+     aMsg + " - got '" + prettyName(aObj) +
+            "', expected '" + prettyName(aExpectedObj) + "'");
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Helpers for getting DOM node/accessible
+
+/**
+ * Return the DOM node by identifier (may be accessible, DOM node or ID).
+ */
+function getNode(aAccOrNodeOrID, aDocument)
+{
+  if (!aAccOrNodeOrID)
+    return null;
+
+  if (aAccOrNodeOrID instanceof nsIDOMNode)
+    return aAccOrNodeOrID;
+
+  if (aAccOrNodeOrID instanceof nsIAccessible)
+    return aAccOrNodeOrID.DOMNode;
+
+  var node = (aDocument || document).getElementById(aAccOrNodeOrID);
+  if (!node) {
+    ok(false, "Can't get DOM element for " + aAccOrNodeOrID);
+    return null;
+  }
+
+  return node;
+}
+
+/**
+ * Constants indicates getAccessible doesn't fail if there is no accessible.
+ */
+const DONOTFAIL_IF_NO_ACC = 1;
+
+/**
+ * Constants indicates getAccessible won't fail if accessible doesn't implement
+ * the requested interfaces.
+ */
+const DONOTFAIL_IF_NO_INTERFACE = 2;
+
+/**
+ * Return accessible for the given identifier (may be ID attribute or DOM
+ * element or accessible object) or null.
+ *
+ * @param aAccOrElmOrID      [in] identifier to get an accessible implementing
+ *                           the given interfaces
+ * @param aInterfaces        [in, optional] the interface or an array interfaces
+ *                           to query it/them from obtained accessible
+ * @param aElmObj            [out, optional] object to store DOM element which
+ *                           accessible is obtained for
+ * @param aDoNotFailIf       [in, optional] no error for special cases (see
+ *                            constants above)
+ */
+function getAccessible(aAccOrElmOrID, aInterfaces, aElmObj, aDoNotFailIf)
+{
+  if (!aAccOrElmOrID)
+    return null;
+
+  var elm = null;
+
+  if (aAccOrElmOrID instanceof nsIAccessible) {
+    try { elm = aAccOrElmOrID.DOMNode; } catch(e) { }
+
+  } else if (aAccOrElmOrID instanceof nsIDOMNode) {
+    elm = aAccOrElmOrID;
+
+  } else {
+    elm = document.getElementById(aAccOrElmOrID);
+    if (!elm) {
+      ok(false, "Can't get DOM element for " + aAccOrElmOrID);
+      return null;
+    }
+  }
+
+  if (aElmObj && (typeof aElmObj == "object"))
+    aElmObj.value = elm;
+
+  var acc = (aAccOrElmOrID instanceof nsIAccessible) ? aAccOrElmOrID : null;
+  if (!acc) {
+    try {
+      acc = gAccService.getAccessibleFor(elm);
+    } catch (e) {
+    }
+
+    if (!acc) {
+      if (!(aDoNotFailIf & DONOTFAIL_IF_NO_ACC))
+        ok(false, "Can't get accessible for " + prettyName(aAccOrElmOrID));
+
+      return null;
+    }
+  }
+
+  if (!aInterfaces)
+    return acc;
+
+  if (!(aInterfaces instanceof Array))
+    aInterfaces = [ aInterfaces ];
+
+  for (var index = 0; index < aInterfaces.length; index++) {
+    if (acc instanceof aInterfaces[index]) {
+      continue;
+    }
+    try {
+      acc.QueryInterface(aInterfaces[index]);
+    } catch (e) {
+      if (!(aDoNotFailIf & DONOTFAIL_IF_NO_INTERFACE))
+        ok(false, "Can't query " + aInterfaces[index] + " for " + aAccOrElmOrID);
+
+      return null;
+    }
+  }
+
+  return acc;
+}
+
+/**
+ * Return true if the given identifier has an accessible, or exposes the wanted
+ * interfaces.
+ */
+function isAccessible(aAccOrElmOrID, aInterfaces)
+{
+  return getAccessible(aAccOrElmOrID, aInterfaces, null,
+                       DONOTFAIL_IF_NO_ACC | DONOTFAIL_IF_NO_INTERFACE) ?
+    true : false;
+}
+
+/**
+ * Return an accessible that contains the DOM node for the given identifier.
+ */
+function getContainerAccessible(aAccOrElmOrID)
+{
+  var node = getNode(aAccOrElmOrID);
+  if (!node)
+    return null;
+
+  while ((node = node.parentNode) && !isAccessible(node));
+  return node ? getAccessible(node) : null;
+}
+
+/**
+ * Return root accessible for the given identifier.
+ */
+function getRootAccessible(aAccOrElmOrID)
+{
+  var acc = getAccessible(aAccOrElmOrID ? aAccOrElmOrID : document);
+  return acc ? acc.rootDocument.QueryInterface(nsIAccessible) : null;
+}
+
+/**
+ * Return tab document accessible the given accessible is contained by.
+ */
+function getTabDocAccessible(aAccOrElmOrID)
+{
+  var acc = getAccessible(aAccOrElmOrID ? aAccOrElmOrID : document);
+
+  var docAcc = acc.document.QueryInterface(nsIAccessible);
+  var containerDocAcc = docAcc.parent.document;
+
+  // Test is running is stand-alone mode.
+  if (acc.rootDocument == containerDocAcc)
+    return docAcc;
+
+  // In the case of running all tests together.
+  return containerDocAcc.QueryInterface(nsIAccessible);
+}
+
+/**
+ * Return application accessible.
+ */
+function getApplicationAccessible()
+{
+  return gAccService.getApplicationAccessible().
+    QueryInterface(nsIAccessibleApplication);
+}
+
+/**
+ * A version of accessible tree testing, doesn't fail if tree is not complete.
+ */
+function testElm(aID, aTreeObj)
+{
+  testAccessibleTree(aID, aTreeObj, kSkipTreeFullCheck);
+}
+
+/**
+ * Flags used for testAccessibleTree
+ */
+const kSkipTreeFullCheck = 1;
+
+/**
+ * Compare expected and actual accessibles trees.
+ *
+ * @param  aAccOrElmOrID  [in] accessible identifier
+ * @param  aAccTree       [in] JS object, each field corresponds to property of
+ *                         accessible object. Additionally special properties
+ *                         are presented:
+ *                          children - an array of JS objects representing
+ *                                      children of accessible
+ *                          states   - an object having states and extraStates
+ *                                      fields
+ * @param aFlags          [in, optional] flags, see constants above
+ */
+function testAccessibleTree(aAccOrElmOrID, aAccTree, aFlags)
+{
+  var acc = getAccessible(aAccOrElmOrID);
+  if (!acc)
+    return;
+
+  var accTree = aAccTree;
+
+  // Support of simplified accessible tree object.
+  accTree = normalizeAccTreeObj(accTree);
+
+  // Test accessible properties.
+  for (var prop in accTree) {
+    var msg = "Wrong value of property '" + prop + "' for " +
+               prettyName(acc) + ".";
+
+    switch (prop) {
+    case "actions": {
+      testActionNames(acc, accTree.actions);
+      break;
+    }
+
+    case "attributes":
+      testAttrs(acc, accTree[prop], true);
+      break;
+
+    case "absentAttributes":
+      testAbsentAttrs(acc, accTree[prop]);
+      break;
+
+    case "interfaces": {
+      var ifaces = (accTree[prop] instanceof Array) ?
+        accTree[prop] : [ accTree[prop] ];
+      for (var i = 0; i < ifaces.length; i++) {
+        ok((acc instanceof ifaces[i]),
+           "No " + ifaces[i] + " interface on " + prettyName(acc));
+      }
+      break;
+    }
+
+    case "relations": {
+      for (var rel in accTree[prop])
+        testRelation(acc, window[rel], accTree[prop][rel]);
+      break;
+    }
+
+    case "role":
+      isRole(acc, accTree[prop], msg);
+      break;
+
+    case "states":
+    case "extraStates":
+    case "absentStates":
+    case "absentExtraStates": {
+      testStates(acc, accTree["states"], accTree["extraStates"],
+                 accTree["absentStates"], accTree["absentExtraStates"]);
+      break;
+    }
+
+    case "tagName":
+      is(accTree[prop], acc.DOMNode.tagName, msg);
+      break;
+
+    case "textAttrs": {
+      var prevOffset = -1;
+      for (var offset in accTree[prop]) {
+        if (prevOffset !=- 1) {
+          var attrs = accTree[prop][prevOffset];
+          testTextAttrs(acc, prevOffset, attrs, { }, prevOffset, +offset, true);
+        }
+        prevOffset = +offset;
+      }
+
+      if (prevOffset != -1) {
+        var charCount = getAccessible(acc, [nsIAccessibleText]).characterCount;
+        var attrs = accTree[prop][prevOffset];
+        testTextAttrs(acc, prevOffset, attrs, { }, prevOffset, charCount, true);
+      }
+
+      break;
+    }
+
+    default:
+      if (prop.indexOf("todo_") == 0)
+        todo(false, msg);
+      else if (prop != "children")
+        is(acc[prop], accTree[prop], msg);
+    }
+  }
+
+  // Test children.
+  if ("children" in accTree && accTree["children"] instanceof Array) {
+    var children = acc.children;
+    var childCount = children.length;
+
+    if (accTree.children.length != childCount) {
+      for (var i = 0; i < Math.max(accTree.children.length, childCount); i++) {
+        var accChild = null, testChild = null;
+        try {
+          testChild = accTree.children[i];
+          accChild = children.queryElementAt(i, nsIAccessible);
+
+          if (!testChild) {
+            ok(false, prettyName(acc) + " has an extra child at index " + i +
+              " : " + prettyName(accChild));
+            continue;
+          }
+
+          testChild = normalizeAccTreeObj(testChild);
+          if (accChild.role !== testChild.role) {
+            ok(false, prettyName(accTree) + " and " + prettyName(acc) +
+              " have different children at index " + i + " : " +
+              prettyName(testChild) + ", " + prettyName(accChild));
+          }
+          info("Matching " + prettyName(accTree) + " and " + prettyName(acc) +
+               " child at index " + i + " : " + prettyName(accChild));
+
+        } catch (e) {
+          ok(false, prettyName(accTree) + " is expected to have a child at index " + i +
+             " : " + prettyName(testChild) + ", original tested: " +
+             prettyName(aAccOrElmOrID) + ", " + e);
+        }
+      }
+    } else {
+      if (aFlags & kSkipTreeFullCheck) {
+        for (var i = 0; i < childCount; i++) {
+          var child = children.queryElementAt(i, nsIAccessible);
+          testAccessibleTree(child, accTree.children[i], aFlags);
+        }
+        return;
+      }
+
+      // nsIAccessible::firstChild
+      var expectedFirstChild = childCount > 0 ?
+        children.queryElementAt(0, nsIAccessible) : null;
+      var firstChild = null;
+      try { firstChild = acc.firstChild; } catch (e) {}
+      is(firstChild, expectedFirstChild,
+         "Wrong first child of " + prettyName(acc));
+
+      // nsIAccessible::lastChild
+      var expectedLastChild = childCount > 0 ?
+        children.queryElementAt(childCount - 1, nsIAccessible) : null;
+      var lastChild = null;
+      try { lastChild = acc.lastChild; } catch (e) {}
+      is(lastChild, expectedLastChild,
+         "Wrong last child of " + prettyName(acc));
+
+      for (var i = 0; i < childCount; i++) {
+        var child = children.queryElementAt(i, nsIAccessible);
+
+        // nsIAccessible::parent
+        var parent = null;
+        try { parent = child.parent; } catch (e) {}
+        is(parent, acc, "Wrong parent of " + prettyName(child));
+
+        // nsIAccessible::indexInParent
+        var indexInParent = -1;
+        try { indexInParent = child.indexInParent; } catch(e) {}
+        is(indexInParent, i,
+           "Wrong index in parent of " + prettyName(child));
+
+        // nsIAccessible::nextSibling
+        var expectedNextSibling = (i < childCount - 1) ?
+          children.queryElementAt(i + 1, nsIAccessible) : null;
+        var nextSibling = null;
+        try { nextSibling = child.nextSibling; } catch (e) {}
+        is(nextSibling, expectedNextSibling,
+           "Wrong next sibling of " + prettyName(child));
+
+        // nsIAccessible::previousSibling
+        var expectedPrevSibling = (i > 0) ?
+          children.queryElementAt(i - 1, nsIAccessible) : null;
+        var prevSibling = null;
+        try { prevSibling = child.previousSibling; } catch (e) {}
+        is(prevSibling, expectedPrevSibling,
+           "Wrong previous sibling of " + prettyName(child));
+
+        // Go down through subtree
+        testAccessibleTree(child, accTree.children[i], aFlags);
+      }
+    }
+  }
+}
+
+/**
+ * Return true if accessible for the given node is in cache.
+ */
+function isAccessibleInCache(aNodeOrId)
+{
+  var node = getNode(aNodeOrId);
+  return gAccService.getAccessibleFromCache(node) ? true : false;
+}
+
+/**
+ * Test accessible tree for defunct accessible.
+ *
+ * @param  aAcc       [in] the defunct accessible
+ * @param  aNodeOrId  [in] the DOM node identifier for the defunct accessible
+ */
+function testDefunctAccessible(aAcc, aNodeOrId)
+{
+  if (aNodeOrId)
+    ok(!isAccessible(aNodeOrId),
+       "Accessible for " + aNodeOrId + " wasn't properly shut down!");
+
+  var msg = " doesn't fail for shut down accessible " +
+             prettyName(aNodeOrId) + "!";
+
+  // firstChild
+  var success = false;
+  try {
+    aAcc.firstChild;
+  } catch (e) {
+    success = (e.result == Components.results.NS_ERROR_FAILURE)
+  }
+  ok(success, "firstChild" + msg);
+
+  // lastChild
+  success = false;
+  try {
+    aAcc.lastChild;
+  } catch (e) {
+    success = (e.result == Components.results.NS_ERROR_FAILURE)
+  }
+  ok(success, "lastChild" + msg);
+
+  // childCount
+  success = false;
+  try {
+    aAcc.childCount;
+  } catch (e) {
+    success = (e.result == Components.results.NS_ERROR_FAILURE)
+  }
+  ok(success, "childCount" + msg);
+
+  // children
+  success = false;
+  try {
+    aAcc.children;
+  } catch (e) {
+    success = (e.result == Components.results.NS_ERROR_FAILURE)
+  }
+  ok(success, "children" + msg);
+
+  // nextSibling
+  success = false;
+  try {
+    aAcc.nextSibling;
+  } catch (e) {
+    success = (e.result == Components.results.NS_ERROR_FAILURE);
+  }
+  ok(success, "nextSibling" + msg);
+
+  // previousSibling
+  success = false;
+  try {
+    aAcc.previousSibling;
+  } catch (e) {
+    success = (e.result == Components.results.NS_ERROR_FAILURE);
+  }
+  ok(success, "previousSibling" + msg);
+
+  // parent
+  success = false;
+  try {
+    aAcc.parent;
+  } catch (e) {
+    success = (e.result == Components.results.NS_ERROR_FAILURE);
+  }
+  ok(success, "parent" + msg);
+}
+
+/**
+ * Convert role to human readable string.
+ */
+function roleToString(aRole)
+{
+  return gAccService.getStringRole(aRole);
+}
+
+/**
+ * Convert states to human readable string.
+ */
+function statesToString(aStates, aExtraStates)
+{
+  var list = gAccService.getStringStates(aStates, aExtraStates);
+
+  var str = "";
+  for (var index = 0; index < list.length - 1; index++)
+    str += list.item(index) + ", ";
+
+  if (list.length != 0)
+    str += list.item(index)
+
+  return str;
+}
+
+/**
+ * Convert event type to human readable string.
+ */
+function eventTypeToString(aEventType)
+{
+  return gAccService.getStringEventType(aEventType);
+}
+
+/**
+ * Convert relation type to human readable string.
+ */
+function relationTypeToString(aRelationType)
+{
+  return gAccService.getStringRelationType(aRelationType);
+}
+
+function getLoadContext() {
+  const Ci = Components.interfaces;
+  return window.QueryInterface(Ci.nsIInterfaceRequestor)
+               .getInterface(Ci.nsIWebNavigation)
+               .QueryInterface(Ci.nsILoadContext);
+}
+
+/**
+ * Return text from clipboard.
+ */
+function getTextFromClipboard()
+{
+  var clip = Components.classes["@mozilla.org/widget/clipboard;1"].
+    getService(Components.interfaces.nsIClipboard);
+  if (!clip)
+    return "";
+
+  var trans = Components.classes["@mozilla.org/widget/transferable;1"].
+    createInstance(Components.interfaces.nsITransferable);
+  trans.init(getLoadContext());
+  if (!trans)
+    return "";
+
+  trans.addDataFlavor("text/unicode");
+  clip.getData(trans, clip.kGlobalClipboard);
+
+  var str = new Object();
+  var strLength = new Object();
+  trans.getTransferData("text/unicode", str, strLength);
+
+  if (str)
+    str = str.value.QueryInterface(Components.interfaces.nsISupportsString);
+  if (str)
+    return str.data.substring(0, strLength.value / 2);
+
+  return "";
+}
+
+/**
+ * Extract DOMNode id from an accessible. If e10s is enabled, DOMNode is not
+ * present in parent process but, if available, DOMNode id is attached to an
+ * accessible object.
+ * @param  {nsIAccessible} accessible  accessible
+ * @return {String?}                   DOMNode id if available
+ */
+function getAccessibleDOMNodeID(accessible) {
+  if (accessible instanceof nsIAccessibleDocument) {
+    // If accessible is a document, trying to find its document body id.
+    try {
+      return accessible.DOMNode.body.id;
+    } catch (e) { /* This only works if accessible is not a proxy. */ }
+  }
+  try {
+    return accessible.DOMNode.id;
+  } catch (e) { /* This will fail if DOMNode is in different process. */ }
+  try {
+    // When e10s is enabled, accessible will have an "id" property if its
+    // corresponding DOMNode has an id. If accessible is a document, its "id"
+    // property corresponds to the "id" of its body element.
+    return accessible.id;
+  } catch (e) { /* This will fail if accessible is not a proxy. */ }
+}
+
+/**
+ * Return pretty name for identifier, it may be ID, DOM node or accessible.
+ */
+function prettyName(aIdentifier)
+{
+  if (aIdentifier instanceof Array) {
+    var msg = "";
+    for (var idx = 0; idx < aIdentifier.length; idx++) {
+      if (msg != "")
+        msg += ", ";
+
+      msg += prettyName(aIdentifier[idx]);
+    }
+    return msg;
+  }
+
+  if (aIdentifier instanceof nsIAccessible) {
+    var acc = getAccessible(aIdentifier);
+    var domID = getAccessibleDOMNodeID(acc);
+    var msg = "[";
+    try {
+      if (Services.appinfo.browserTabsRemoteAutostart) {
+        if (domID) {
+          msg += `DOM node id: ${domID}, `;
+        }
+      } else {
+        msg += `${getNodePrettyName(acc.DOMNode)}, `;
+      }
+      msg += "role: " + roleToString(acc.role);
+      if (acc.name)
+        msg += ", name: '" + shortenString(acc.name) + "'";
+    } catch (e) {
+      msg += "defunct";
+    }
+
+    if (acc)
+      msg += ", address: " + getObjAddress(acc);
+    msg += "]";
+
+    return msg;
+  }
+
+  if (aIdentifier instanceof nsIDOMNode)
+    return "[ " + getNodePrettyName(aIdentifier) + " ]";
+
+  if (aIdentifier && typeof aIdentifier === "object" ) {
+    var treeObj = normalizeAccTreeObj(aIdentifier);
+    if ("role" in treeObj) {
+      function stringifyTree(aObj) {
+        var text = roleToString(aObj.role) + ": [ ";
+        if ("children" in aObj) {
+          for (var i = 0; i < aObj.children.length; i++) {
+            var c = normalizeAccTreeObj(aObj.children[i]);
+            text += stringifyTree(c);
+            if (i < aObj.children.length - 1) {
+              text += ", ";
+            }
+          }
+        }
+        return text + "] ";
+      }
+      return `{ ${stringifyTree(treeObj)} }`;
+    }
+    return JSON.stringify(aIdentifier);
+  }
+
+  return " '" + aIdentifier + "' ";
+}
+
+/**
+ * Shorten a long string if it exceeds MAX_TRIM_LENGTH.
+ * @param aString the string to shorten.
+ * @returns the shortened string.
+ */
+function shortenString(aString, aMaxLength)
+{
+  if (aString.length <= MAX_TRIM_LENGTH)
+    return aString;
+
+  // Trim the string if its length is > MAX_TRIM_LENGTH characters.
+  var trimOffset = MAX_TRIM_LENGTH / 2;
+  return aString.substring(0, trimOffset - 1) + "..." +
+    aString.substring(aString.length - trimOffset, aString.length);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// General Utils
+////////////////////////////////////////////////////////////////////////////////
+/**
+ * Return main chrome window (crosses chrome boundary)
+ */
+function getMainChromeWindow(aWindow)
+{
+  return aWindow.QueryInterface(Components.interfaces.nsIInterfaceRequestor)
+                .getInterface(Components.interfaces.nsIWebNavigation)
+                .QueryInterface(Components.interfaces.nsIDocShellTreeItem)
+                .rootTreeItem
+                .QueryInterface(Components.interfaces.nsIInterfaceRequestor)
+                .getInterface(Components.interfaces.nsIDOMWindow);
+}
+
+/** Sets the test plugin(s) initially expected enabled state.
+ * It will automatically be reset to it's previous value after the test
+ * ends.
+ * @param aNewEnabledState [in] the enabled state, e.g. SpecialPowers.Ci.nsIPluginTag.STATE_ENABLED
+ * @param aPluginName [in, optional] The name of the plugin, defaults to "Test Plug-in"
+ */
+function setTestPluginEnabledState(aNewEnabledState, aPluginName)
+{
+  var plugin = getTestPluginTag(aPluginName);
+  var oldEnabledState = plugin.enabledState;
+  plugin.enabledState = aNewEnabledState;
+  SimpleTest.registerCleanupFunction(function() {
+    getTestPluginTag(aPluginName).enabledState = oldEnabledState;
+  });
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Private
+////////////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////////////
+// Accessible general
+
+function getNodePrettyName(aNode)
+{
+  try {
+    var tag = "";
+    if (aNode.nodeType == nsIDOMNode.DOCUMENT_NODE) {
+      tag = "document";
+    } else {
+      tag = aNode.localName;
+      if (aNode.nodeType == nsIDOMNode.ELEMENT_NODE && aNode.hasAttribute("id"))
+        tag += "@id=\"" + aNode.getAttribute("id") + "\"";
+    }
+
+    return "'" + tag + " node', address: " + getObjAddress(aNode);
+  } catch (e) {
+    return "' no node info '";
+  }
+}
+
+function getObjAddress(aObj)
+{
+  var exp = /native\s*@\s*(0x[a-f0-9]+)/g;
+  var match = exp.exec(aObj.toString());
+  if (match)
+    return match[1];
+
+  return aObj.toString();
+}
+
+function getTestPluginTag(aPluginName)
+{
+  var ph = SpecialPowers.Cc["@mozilla.org/plugin/host;1"]
+                        .getService(SpecialPowers.Ci.nsIPluginHost);
+  var tags = ph.getPluginTags();
+  var name = aPluginName || "Test Plug-in";
+  for (var tag of tags) {
+    if (tag.name == name) {
+      return tag;
+    }
+  }
+
+  ok(false, "Could not find plugin tag with plugin name '" + name + "'");
+  return null;
+}
+
+function normalizeAccTreeObj(aObj)
+{
+  var key = Object.keys(aObj)[0];
+  var roleName = "ROLE_" + key;
+  if (roleName in nsIAccessibleRole) {
+    return {
+      role: nsIAccessibleRole[roleName],
+      children: aObj[key]
+    };
+  }
+  return aObj;
+}