diff --git a/core/block_svg.js b/core/block_svg.js
index ed93fc845..8b1429bd4 100644
--- a/core/block_svg.js
+++ b/core/block_svg.js
@@ -390,6 +390,28 @@ Blockly.BlockSvg.prototype.moveToDragSurface_ = function() {
   this.workspace.blockDragSurface_.setBlocksAndShow(this.getSvgRoot());
 };
 
+/**
+ * Move a block to a position.
+ * @param {goog.math.Coordinate} xy The position to move to in workspace units.
+ */
+Blockly.BlockSvg.prototype.moveTo = function(xy) {
+  if (this.parentBlock_) {
+    throw Error('Block has parent.');
+  }
+  var eventsEnabled = Blockly.Events.isEnabled();
+  if (eventsEnabled) {
+    var event = new Blockly.Events.BlockMove(this);
+  }
+  var curXY = this.getRelativeToSurfaceXY();
+  this.translate(xy.x, xy.y);
+  this.moveConnections_(xy.x - curXY.x, xy.y - curXY.y);
+  if (eventsEnabled) {
+    event.recordNew();
+    Blockly.Events.fire(event);
+  }
+  this.workspace.resizeContents();
+};
+
 /**
  * Move this block back to the workspace block canvas.
  * Generally should be called at the same time as setDragging_(false).
@@ -1499,3 +1521,25 @@ Blockly.BlockSvg.prototype.scheduleSnapAndBump = function() {
     Blockly.Events.setGroup(false);
   }, Blockly.BUMP_DELAY);
 };
+
+/**
+ * Position a block so that it doesn't move the target block when connected.
+ * The block to position is usually either the first block in a dragged stack or
+ * an insertion marker.
+ * @param {!Blockly.Connection} sourceConnection The connection on the moving
+ *     block's stack.
+ * @param {!Blockly.Connection} targetConnection The connection that should stay
+ *     stationary as this block is positioned.
+ */
+Blockly.BlockSvg.prototype.positionNearConnection = function(sourceConnection,
+    targetConnection) {
+  // We only need to position the new block if it's before the existing one,
+  // otherwise its position is set by the previous block.
+  if (sourceConnection.type == Blockly.NEXT_STATEMENT ||
+      sourceConnection.type == Blockly.INPUT_VALUE) {
+    var dx = targetConnection.x_ - sourceConnection.x_;
+    var dy = targetConnection.y_ - sourceConnection.y_;
+
+    this.moveBy(dx, dy);
+  }
+};
diff --git a/core/connection.js b/core/connection.js
index 082cfc441..52e5f9f11 100644
--- a/core/connection.js
+++ b/core/connection.js
@@ -710,6 +710,25 @@ Blockly.Connection.prototype.neighbours_ = function(_maxLimit) {
   return [];
 };
 
+/**
+ * Get the parent input of a connection.
+ * @return {Blockly.Input} The input that the connection belongs to or null if
+ *     no parent exists.
+ * @package
+ */
+Blockly.Connection.prototype.getParentInput = function() {
+  var parentInput = null;
+  var block = this.sourceBlock_;
+  var inputs = block.inputList;
+  for (var idx = 0; idx < block.inputList.length; idx++) {
+    if (inputs[idx].connection === this) {
+      parentInput = inputs[idx];
+      break;
+    }
+  }
+  return parentInput;
+};
+
 /**
  * This method returns a string describing this Connection in developer terms
  * (English only). Intended to on be used in console logs and errors.
diff --git a/core/css.js b/core/css.js
index 1fa075011..775f9d4f1 100644
--- a/core/css.js
+++ b/core/css.js
@@ -647,6 +647,11 @@ Blockly.Css.CONTENT = [
     'padding: 0 !important;',
   '}',
 
+  '.blocklyVerticalCursor {',
+    'stroke-width: 3px;',
+    'fill: rgba(255,255,255,0.5);',
+  '}',
+
   '.blocklyWidgetDiv .goog-option-selected .goog-menuitem-checkbox,',
   '.blocklyWidgetDiv .goog-option-selected .goog-menuitem-icon {',
     'background: url(<<<PATH>>>/sprites.png) no-repeat -48px -16px;',
diff --git a/core/field.js b/core/field.js
index 1ff332c76..42cb66646 100644
--- a/core/field.js
+++ b/core/field.js
@@ -936,3 +936,27 @@ Blockly.Field.prototype.getAbsoluteXY_ = function() {
 Blockly.Field.prototype.referencesVariables = function() {
   return false;
 };
+
+/**
+ * Search through the list of inputs and their fields in order to find the
+ * parent input of a field.
+ * @return {Blockly.Input} The input that the field belongs to.
+ * @package
+ */
+Blockly.Field.prototype.getParentInput = function() {
+  var parentInput = null;
+  var block = this.sourceBlock_;
+  var inputs = block.inputList;
+
+  for (var idx = 0; idx < block.inputList.length; idx++) {
+    var input = inputs[idx];
+    var fieldRows = input.fieldRow;
+    for (var j = 0; j < fieldRows.length; j++) {
+      if (fieldRows[j] === this) {
+        parentInput = input;
+        break;
+      }
+    }
+  }
+  return parentInput;
+};
diff --git a/core/input.js b/core/input.js
index 5b9c8b170..ddfa1d772 100644
--- a/core/input.js
+++ b/core/input.js
@@ -71,6 +71,14 @@ Blockly.Input.prototype.align = Blockly.ALIGN_LEFT;
  */
 Blockly.Input.prototype.visible_ = true;
 
+/**
+ * Get the source block for this input.
+ * @return {Blockly.Block} The source block, or null if there is none.
+ */
+Blockly.Input.prototype.getSourceBlock = function() {
+  return this.sourceBlock_;
+};
+
 /**
  * Add a field (or label from string), and all prefix and suffix fields, to the
  * end of the input's field row.
diff --git a/core/rendered_connection.js b/core/rendered_connection.js
index b9ab29a16..610881f9d 100644
--- a/core/rendered_connection.js
+++ b/core/rendered_connection.js
@@ -162,6 +162,15 @@ Blockly.RenderedConnection.prototype.setOffsetInBlock = function(x, y) {
   this.offsetInBlock_.y = y;
 };
 
+/**
+ * Get the offset of this connection relative to the top left of its block.
+ * @return {!goog.math.Coordinate} The offset of the connection.
+ * @package
+ */
+Blockly.RenderedConnection.prototype.getOffsetInBlock = function() {
+  return this.offsetInBlock_;
+};
+
 /**
  * Move the blocks on either side of this connection right next to each other.
  * @private
diff --git a/core/utils.js b/core/utils.js
index 160696d76..fe29242c5 100644
--- a/core/utils.js
+++ b/core/utils.js
@@ -586,6 +586,42 @@ Blockly.utils.getBlockTypeCounts = function(block, opt_stripFollowing) {
   return typeCountsMap;
 };
 
+/**
+ * Converts screen coordinates to workspace coordinates.
+ * @param {Blockly.Workspace_Svg} ws The workspace to find the coordinates on.
+ * @param {goog.math.Coordinate} screenCoordinates The screen coordinates to be
+ * converted to workspace coordintaes
+ * @return {goog.math.Coorindate} The workspace coordinates.
+ * @package
+ */
+Blockly.utils.screenToWsCoordinates = function(ws, screenCoordinates) {
+  var screenX = screenCoordinates.x;
+  var screenY = screenCoordinates.y;
+
+  var injectionDiv = ws.getInjectionDiv();
+  // Bounding rect coordinates are in client coordinates, meaning that they
+  // are in pixels relative to the upper left corner of the visible browser
+  // window.  These coordinates change when you scroll the browser window.
+  var boundingRect = injectionDiv.getBoundingClientRect();
+
+  // The client coordinates offset by the injection div's upper left corner.
+  var clientOffsetPixels = new goog.math.Coordinate(
+      screenX - boundingRect.left, screenY - boundingRect.top);
+
+  // The offset in pixels between the main workspace's origin and the upper
+  // left corner of the injection div.
+  var mainOffsetPixels = ws.getOriginOffsetInPixels();
+
+  // The position of the new comment in pixels relative to the origin of the
+  // main workspace.
+  var finalOffsetPixels = goog.math.Coordinate.difference(clientOffsetPixels,
+      mainOffsetPixels);
+
+  // The position in main workspace coordinates.
+  var finalOffsetMainWs = finalOffsetPixels.scale(1 / ws.scale);
+  return finalOffsetMainWs;
+};
+
 /**
  * Reference to the global object.
  */