adding additional type annotations

core/block_svg.js

@@ -41,12 +41,16 @@ goog.require('goog.math.Coordinate');
  */
 Blockly.BlockSvg = function() {
   // Create core elements for the block.
+  /** @type {SVGElement} */
   this.svgGroup_ = Blockly.createSvgElement('g', {}, null);
+  /** @type {SVGElement} */
   this.svgPathDark_ = Blockly.createSvgElement('path',
       {'class': 'blocklyPathDark', 'transform': 'translate(1,1)'},
       this.svgGroup_);
+  /** @type {SVGElement} */
   this.svgPath_ = Blockly.createSvgElement('path', {'class': 'blocklyPath'},
       this.svgGroup_);
+  /** @type {SVGElement} */
   this.svgPathLight_ = Blockly.createSvgElement('path',
       {'class': 'blocklyPathLight'}, this.svgGroup_);
   this.svgPath_.tooltip = this;

core/field_image.js

@@ -76,17 +76,22 @@ Blockly.FieldImage.prototype.init = function(block) {
   }
   this.sourceBlock_ = block;
   // Build the DOM.
+  /** @type {SVGElement} */
   this.fieldGroup_ = Blockly.createSvgElement('g', {}, null);
   if (!this.visible_) {
     this.fieldGroup_.style.display = 'none';
   }
+  /** @type {SVGElement} */
   this.imageElement_ = Blockly.createSvgElement('image',
       {'height': this.height_ + 'px',
        'width': this.width_ + 'px'}, this.fieldGroup_);
   this.setValue(this.src_);
   if (goog.userAgent.GECKO) {
-    // Due to a Firefox bug which eats mouse events on image elements,
-    // a transparent rectangle needs to be placed on top of the image.
+    /**
+     * Due to a Firefox bug which eats mouse events on image elements,
+     * a transparent rectangle needs to be placed on top of the image.
+     * @type {SVGElement}
+     */
     this.rectElement_ = Blockly.createSvgElement('rect',
         {'height': this.height_ + 'px',
          'width': this.width_ + 'px',

core/workspace_svg.js

@@ -158,10 +158,12 @@ Blockly.WorkspaceSvg.prototype.createDom = function(opt_backgroundClass) {
     <g class="blocklyBubbleCanvas"></g>
     [Scrollbars may go here]
   </g>
+  @type {SVGElement}
   */
   this.svgGroup_ = Blockly.createSvgElement('g',
       {'class': 'blocklyWorkspace'}, null);
   if (opt_backgroundClass) {
+    /** @type {SVGElement} */
     this.svgBackground_ = Blockly.createSvgElement('rect',
         {'height': '100%', 'width': '100%',
          'class': opt_backgroundClass}, this.svgGroup_);
@@ -170,8 +172,10 @@ Blockly.WorkspaceSvg.prototype.createDom = function(opt_backgroundClass) {
           'url(#' + this.options.gridPattern.id + ')';
     }
   }
+  /** @type {SVGElement} */
   this.svgBlockCanvas_ = Blockly.createSvgElement('g',
       {'class': 'blocklyBlockCanvas'}, this.svgGroup_, this);
+  /** @type {SVGElement} */
   this.svgBubbleCanvas_ = Blockly.createSvgElement('g',
       {'class': 'blocklyBubbleCanvas'}, this.svgGroup_, this);
   var bottom = Blockly.Scrollbar.scrollbarThickness;