diff --git a/core/gesture.js b/core/gesture.js
index 2742384f3..9a9dc8f8e 100644
--- a/core/gesture.js
+++ b/core/gesture.js
@@ -110,7 +110,7 @@ Blockly.Gesture = function(e, creatorWorkspace) {
    * workspaces on a page; this is more accurate than using
    * Blockly.getMainWorkspace().
    * @type {Blockly.WorkspaceSvg}
-   * @private
+   * @protected
    */
   this.startWorkspace_ = null;
 
@@ -165,7 +165,7 @@ Blockly.Gesture = function(e, creatorWorkspace) {
    * A handle to use to unbind a mouse move listener at the end of a drag.
    * Opaque data returned from Blockly.bindEventWithChecks_.
    * @type {Array.<!Array>}
-   * @private
+   * @protected
    */
   this.onMoveWrapper_ = null;
 
@@ -173,7 +173,7 @@ Blockly.Gesture = function(e, creatorWorkspace) {
    * A handle to use to unbind a mouse up listener at the end of a drag.
    * Opaque data returned from Blockly.bindEventWithChecks_.
    * @type {Array.<!Array>}
-   * @private
+   * @protected
    */
   this.onUpWrapper_ = null;
 
@@ -223,7 +223,7 @@ Blockly.Gesture = function(e, creatorWorkspace) {
   /**
    * Boolean used internally to break a cycle in disposal.
    * @type {boolean}
-   * @private
+   * @protected
    */
   this.isEnding_ = false;
 
diff --git a/core/workspace_svg.js b/core/workspace_svg.js
index c37bd489a..070474b6f 100644
--- a/core/workspace_svg.js
+++ b/core/workspace_svg.js
@@ -311,7 +311,7 @@ Blockly.WorkspaceSvg.prototype.inverseScreenCTM_ = null;
 
 /**
  * Inverted screen CTM is dirty, recalculate it.
- * @type {Boolean}
+ * @type {boolean}
  * @private
  */
 Blockly.WorkspaceSvg.prototype.inverseScreenCTMDirty_ = true;
@@ -1602,10 +1602,10 @@ Blockly.WorkspaceSvg.prototype.zoomToFit = function() {
  */
 Blockly.WorkspaceSvg.prototype.beginCanvasTransition = function() {
   Blockly.utils.addClass(
-      /** @type {!SVGElement} */ this.svgBlockCanvas_,
+      /** @type {!SVGElement} */ (this.svgBlockCanvas_),
       'blocklyCanvasTransitioning');
   Blockly.utils.addClass(
-      /** @type {!SVGElement} */ this.svgBubbleCanvas_,
+      /** @type {!SVGElement} */ (this.svgBubbleCanvas_),
       'blocklyCanvasTransitioning');
 };
 
@@ -1615,10 +1615,10 @@ Blockly.WorkspaceSvg.prototype.beginCanvasTransition = function() {
  */
 Blockly.WorkspaceSvg.prototype.endCanvasTransition = function() {
   Blockly.utils.removeClass(
-      /** @type {!SVGElement} */ this.svgBlockCanvas_,
+      /** @type {!SVGElement} */ (this.svgBlockCanvas_),
       'blocklyCanvasTransitioning');
   Blockly.utils.removeClass(
-      /** @type {!SVGElement} */ this.svgBubbleCanvas_,
+      /** @type {!SVGElement} */ (this.svgBubbleCanvas_),
       'blocklyCanvasTransitioning');
 };
 /**
diff --git a/core/ws_comment_events.js b/core/ws_comment_events.js
index d3a0f9951..c5e35631a 100644
--- a/core/ws_comment_events.js
+++ b/core/ws_comment_events.js
@@ -215,26 +215,28 @@ Blockly.Events.CommentCreate.prototype.fromJson = function(json) {
  * @param {boolean} forward True if run forward, false if run backward (undo).
  */
 Blockly.Events.CommentCreate.prototype.run = function(forward) {
-  Blockly.Events.CommentCreateDeleteHelper(forward);
+  Blockly.Events.CommentCreateDeleteHelper(this, forward);
 };
 
 /**
  * Helper function for Comment[Create|Delete]
+ * @param {!Blockly.Events.CommentCreate|!Blockly.Events.CommentDelete} event
+ *     The event to run.
  * @param {boolean} create if True then Create, if False then Delete
  */
-Blockly.Events.CommentCreateDeleteHelper = function(create) {
-  var workspace = this.getEventWorkspace_();
+Blockly.Events.CommentCreateDeleteHelper = function(event, create) {
+  var workspace = event.getEventWorkspace_();
   if (create) {
     var xml = goog.dom.createDom('xml');
-    xml.appendChild(this.xml);
+    xml.appendChild(event.xml);
     Blockly.Xml.domToWorkspace(xml, workspace);
   } else {
-    var comment = workspace.getCommentById(this.commentId);
+    var comment = workspace.getCommentById(event.commentId);
     if (comment) {
       comment.dispose(false, false);
     } else {
       // Only complain about root-level block.
-      console.warn("Can't uncreate non-existent comment: " + this.commentId);
+      console.warn("Can't uncreate non-existent comment: " + event.commentId);
     }
   }
 };
@@ -284,7 +286,7 @@ Blockly.Events.CommentDelete.prototype.fromJson = function(json) {
  * @param {boolean} forward True if run forward, false if run backward (undo).
  */
 Blockly.Events.CommentDelete.prototype.run = function(forward) {
-  Blockly.Events.CommentCreateDeleteHelper(!forward);
+  Blockly.Events.CommentCreateDeleteHelper(this, !forward);
 };
 
 /**
diff --git a/core/xml.js b/core/xml.js
index 7a8712eda..5972b2268 100644
--- a/core/xml.js
+++ b/core/xml.js
@@ -133,7 +133,6 @@ Blockly.Xml.fieldToDomVariable_ = function(field) {
 /**
  * Encode a field as XML.
  * @param {!Blockly.Field} field The field to encode.
- * @param {!Blockly.Workspace} workspace The workspace that the field is in.
  * @return {?Element} XML element, or null if the field did not need to be
  *     serialized.
  * @private