diff --git a/closure/goog/deps.js b/closure/goog/deps.js
index a08dc3a144..680f5f67ad 100644
--- a/closure/goog/deps.js
+++ b/closure/goog/deps.js
@@ -414,7 +414,7 @@ goog.addDependency('fs/url_test.js', ['goog.urlTest'], ['goog.fs.url', 'goog.tes
 goog.addDependency('functions/functions.js', ['goog.functions'], [], false);
 goog.addDependency('functions/functions_test.js', ['goog.functionsTest'], ['goog.array', 'goog.functions', 'goog.testing.MockClock', 'goog.testing.PropertyReplacer', 'goog.testing.jsunit', 'goog.testing.recordFunction'], false);
 goog.addDependency('fx/abstractdragdrop.js', ['goog.fx.AbstractDragDrop', 'goog.fx.AbstractDragDrop.EventType', 'goog.fx.DragDropEvent', 'goog.fx.DragDropItem'], ['goog.asserts', 'goog.dom', 'goog.dom.classlist', 'goog.events', 'goog.events.Event', 'goog.events.EventHandler', 'goog.events.EventTarget', 'goog.events.EventType', 'goog.fx.Dragger', 'goog.math.Box', 'goog.math.Coordinate', 'goog.style'], false);
-goog.addDependency('fx/abstractdragdrop_test.js', ['goog.fx.AbstractDragDropTest'], ['goog.array', 'goog.dom.TagName', 'goog.events', 'goog.events.EventType', 'goog.functions', 'goog.fx.AbstractDragDrop', 'goog.fx.DragDropItem', 'goog.math.Box', 'goog.math.Coordinate', 'goog.style', 'goog.testing.events', 'goog.testing.jsunit'], false);
+goog.addDependency('fx/abstractdragdrop_test.js', ['goog.fx.AbstractDragDropTest'], ['goog.array', 'goog.dom.TagName', 'goog.events', 'goog.events.EventType', 'goog.functions', 'goog.fx.AbstractDragDrop', 'goog.fx.DragDropItem', 'goog.math.Box', 'goog.math.Coordinate', 'goog.style', 'goog.testing.events', 'goog.testing.events.Event', 'goog.testing.jsunit'], false);
 goog.addDependency('fx/anim/anim.js', ['goog.fx.anim', 'goog.fx.anim.Animated'], ['goog.async.AnimationDelay', 'goog.async.Delay', 'goog.object'], false);
 goog.addDependency('fx/anim/anim_test.js', ['goog.fx.animTest'], ['goog.async.AnimationDelay', 'goog.async.Delay', 'goog.events', 'goog.functions', 'goog.fx.Animation', 'goog.fx.anim', 'goog.object', 'goog.testing.MockClock', 'goog.testing.PropertyReplacer', 'goog.testing.jsunit', 'goog.testing.recordFunction', 'goog.userAgent'], false);
 goog.addDependency('fx/animation.js', ['goog.fx.Animation', 'goog.fx.Animation.EventType', 'goog.fx.Animation.State', 'goog.fx.AnimationEvent'], ['goog.array', 'goog.events.Event', 'goog.fx.Transition', 'goog.fx.TransitionBase', 'goog.fx.anim', 'goog.fx.anim.Animated'], false);
diff --git a/closure/goog/fx/abstractdragdrop.js b/closure/goog/fx/abstractdragdrop.js
index b77ecfa997..5108ec71c2 100644
--- a/closure/goog/fx/abstractdragdrop.js
+++ b/closure/goog/fx/abstractdragdrop.js
@@ -1404,8 +1404,6 @@ goog.fx.DragDropItem.prototype.maybeStartDrag_ = function(event, element) {
 
   this.startPosition_ = new goog.math.Coordinate(
       event.clientX, event.clientY);
-
-  event.preventDefault();
 };
 
 
@@ -1432,6 +1430,9 @@ goog.fx.DragDropItem.prototype.mouseMove_ = function(event) {
     this.eventHandler_.removeAll();
     this.parent_.startDrag(event, this);
   }
+
+  // Prevent text selection while dragging an element.
+  event.preventDefault();
 };
 
 
diff --git a/closure/goog/fx/abstractdragdrop_test.js b/closure/goog/fx/abstractdragdrop_test.js
index 37f5254ca7..97b4a230da 100644
--- a/closure/goog/fx/abstractdragdrop_test.js
+++ b/closure/goog/fx/abstractdragdrop_test.js
@@ -26,6 +26,7 @@ goog.require('goog.math.Box');
 goog.require('goog.math.Coordinate');
 goog.require('goog.style');
 goog.require('goog.testing.events');
+goog.require('goog.testing.events.Event');
 goog.require('goog.testing.jsunit');
 
 var targets = [
@@ -507,6 +508,22 @@ function testScrollableContainersCalculation() {
   assertEquals(container, group.targetList_[1].scrollableContainer_);
 }
 
+function testMouseDownEventDefaultAction() {
+  var group = new goog.fx.AbstractDragDrop();
+  var target = new goog.fx.AbstractDragDrop();
+  group.addTarget(target);
+  var item1 = new goog.fx.DragDropItem(document.getElementById('child1'));
+  group.items_.push(item1);
+  item1.setParent(group);
+  group.init();
+
+  var mousedownDefaultPrevented =
+      !goog.testing.events.fireMouseDownEvent(item1.element);
+
+  assertFalse('Default action of mousedown event should not be cancelled.',
+      mousedownDefaultPrevented);
+}
+
 // See http://b/7494613.
 function testMouseUpOutsideElement() {
   var group = new goog.fx.AbstractDragDrop();
@@ -583,14 +600,20 @@ function testMouseMove_mouseOutBeforeThreshold() {
     draggedItem = item;
   };
 
-  var event = {'clientX': 8, 'clientY': 10, // Drag distance is only 2
-    'type': goog.events.EventType.MOUSEOUT, 'target': childEl};
+  var event = new goog.testing.events.Event(goog.events.EventType.MOUSEOUT,
+      childEl);
+  // Drag distance is only 2.
+  event.clientX = 8;
+  event.clientY = 10;
   item.mouseMove_(event);
   assertEquals('DragStart should not be fired for mouseout on child element.',
       null, draggedItem);
 
-  var event = {'clientX': 8, 'clientY': 10, // Drag distance is only 2
-    'type': goog.events.EventType.MOUSEOUT, 'target': itemEl};
+  var event = new goog.testing.events.Event(goog.events.EventType.MOUSEOUT,
+      itemEl);
+  // Drag distance is only 2.
+  event.clientX = 8;
+  event.clientY = 10;
   item.mouseMove_(event);
   assertEquals('DragStart should be fired for mouseout on main element.',
       item, draggedItem);