diff --git a/core/block_drag_surface.js b/core/block_drag_surface.js
index a9c46c244..d80924d90 100644
--- a/core/block_drag_surface.js
+++ b/core/block_drag_surface.js
@@ -99,7 +99,7 @@ Blockly.BlockDragSurfaceSvg.prototype.createDom = function() {
   this.SVG_ = Blockly.utils.dom.createSvgElement('svg', {
     'xmlns': Blockly.utils.dom.SVG_NS,
     'xmlns:html': Blockly.utils.dom.HTML_NS,
-    'xmlns:xlink': 'http://www.w3.org/1999/xlink',
+    'xmlns:xlink': Blockly.utils.dom.XLINK_NS,
     'version': '1.1',
     'class': 'blocklyBlockDragSurface'
   }, this.container_);
diff --git a/core/comment.js b/core/comment.js
index f587cc78d..80e4ed1d1 100644
--- a/core/comment.js
+++ b/core/comment.js
@@ -31,7 +31,7 @@ goog.require('Blockly.Events');
 goog.require('Blockly.Events.BlockChange');
 goog.require('Blockly.Events.Ui');
 goog.require('Blockly.Icon');
-goog.provide('Blockly.utils.dom');
+goog.require('Blockly.utils.dom');
 goog.require('Blockly.utils.userAgent');
 
 
diff --git a/core/field_angle.js b/core/field_angle.js
index 6c44deb8b..36ca268dc 100644
--- a/core/field_angle.js
+++ b/core/field_angle.js
@@ -28,7 +28,7 @@ goog.provide('Blockly.FieldAngle');
 
 goog.require('Blockly.DropDownDiv');
 goog.require('Blockly.FieldTextInput');
-goog.provide('Blockly.utils.dom');
+goog.require('Blockly.utils.dom');
 goog.require('Blockly.utils.math');
 goog.require('Blockly.utils.userAgent');
 
@@ -177,9 +177,9 @@ Blockly.FieldAngle.prototype.showEditor_ = function() {
 
   // Build the SVG DOM.
   var svg = Blockly.utils.dom.createSvgElement('svg', {
-    'xmlns': 'http://www.w3.org/2000/svg',
-    'xmlns:html': 'http://www.w3.org/1999/xhtml',
-    'xmlns:xlink': 'http://www.w3.org/1999/xlink',
+    'xmlns': Blockly.utils.dom.SVG_NS,
+    'xmlns:html': Blockly.utils.dom.HTML_NS,
+    'xmlns:xlink': Blockly.utils.dom.XLINK_NS,
     'version': '1.1',
     'height': (Blockly.FieldAngle.HALF * 2) + 'px',
     'width': (Blockly.FieldAngle.HALF * 2) + 'px'
diff --git a/core/field_dropdown.js b/core/field_dropdown.js
index 610fb3c8d..be5ccfaad 100644
--- a/core/field_dropdown.js
+++ b/core/field_dropdown.js
@@ -476,7 +476,7 @@ Blockly.FieldDropdown.prototype.render_ = function() {
  */
 Blockly.FieldDropdown.prototype.renderSelectedImage_ = function() {
   this.imageElement_.setAttributeNS(
-      'http://www.w3.org/1999/xlink', 'xlink:href', this.imageJson_.src);
+      Blockly.utils.dom.XLINK_NS, 'xlink:href', this.imageJson_.src);
   this.imageElement_.setAttribute('height', this.imageJson_.height);
   this.imageElement_.setAttribute('width', this.imageJson_.width);
 
diff --git a/core/field_image.js b/core/field_image.js
index 098ff1d2a..cc4ba0617 100644
--- a/core/field_image.js
+++ b/core/field_image.js
@@ -125,7 +125,7 @@ Blockly.FieldImage.prototype.initView = function() {
         'alt': this.text_
       },
       this.fieldGroup_);
-  this.imageElement_.setAttributeNS('http://www.w3.org/1999/xlink',
+  this.imageElement_.setAttributeNS(Blockly.utils.dom.XLINK_NS,
       'xlink:href', this.value_);
 };
 
@@ -161,7 +161,7 @@ Blockly.FieldImage.prototype.doClassValidation_ = function(newValue) {
 Blockly.FieldImage.prototype.doValueUpdate_ = function(newValue) {
   this.value_ = newValue;
   if (this.imageElement_) {
-    this.imageElement_.setAttributeNS('http://www.w3.org/1999/xlink',
+    this.imageElement_.setAttributeNS(Blockly.utils.dom.XLINK_NS,
         'xlink:href', this.value_ || '');
   }
 };
diff --git a/core/grid.js b/core/grid.js
index 2e78cb819..f8d7bee74 100644
--- a/core/grid.js
+++ b/core/grid.js
@@ -27,7 +27,7 @@
 
 goog.provide('Blockly.Grid');
 
-goog.provide('Blockly.utils.dom');
+goog.require('Blockly.utils.dom');
 goog.require('Blockly.utils.userAgent');
 
 
diff --git a/core/inject.js b/core/inject.js
index 61df917db..e40d110e5 100644
--- a/core/inject.js
+++ b/core/inject.js
@@ -113,9 +113,9 @@ Blockly.createDom_ = function(container, options) {
   </svg>
   */
   var svg = Blockly.utils.dom.createSvgElement('svg', {
-    'xmlns': 'http://www.w3.org/2000/svg',
-    'xmlns:html': 'http://www.w3.org/1999/xhtml',
-    'xmlns:xlink': 'http://www.w3.org/1999/xlink',
+    'xmlns': Blockly.utils.dom.SVG_NS,
+    'xmlns:html': Blockly.utils.dom.HTML_NS,
+    'xmlns:xlink': Blockly.utils.dom.XLINK_NS,
     'version': '1.1',
     'class': 'blocklySvg'
   }, container);
diff --git a/core/trashcan.js b/core/trashcan.js
index 035ff9e77..d97c1ceae 100644
--- a/core/trashcan.js
+++ b/core/trashcan.js
@@ -247,7 +247,7 @@ Blockly.Trashcan.prototype.createDom = function() {
         'clip-path': 'url(#blocklyTrashBodyClipPath' + rnd + ')'
       },
       this.svgGroup_);
-  body.setAttributeNS('http://www.w3.org/1999/xlink', 'xlink:href',
+  body.setAttributeNS(Blockly.utils.dom.XLINK_NS, 'xlink:href',
       this.workspace_.options.pathToMedia + Blockly.SPRITE.url);
 
   clip = Blockly.utils.dom.createSvgElement('clipPath',
@@ -264,7 +264,7 @@ Blockly.Trashcan.prototype.createDom = function() {
         'clip-path': 'url(#blocklyTrashLidClipPath' + rnd + ')'
       },
       this.svgGroup_);
-  this.svgLid_.setAttributeNS('http://www.w3.org/1999/xlink', 'xlink:href',
+  this.svgLid_.setAttributeNS(Blockly.utils.dom.XLINK_NS, 'xlink:href',
       this.workspace_.options.pathToMedia + Blockly.SPRITE.url);
 
   Blockly.bindEventWithChecks_(this.svgGroup_, 'mouseup', this, this.click);
diff --git a/core/utils/dom.js b/core/utils/dom.js
index eff026f0d..3a9b0013e 100644
--- a/core/utils/dom.js
+++ b/core/utils/dom.js
@@ -45,6 +45,12 @@ Blockly.utils.dom.SVG_NS = 'http://www.w3.org/2000/svg';
  */
 Blockly.utils.dom.HTML_NS = 'http://www.w3.org/1999/xhtml';
 
+/**
+ * Required name space for XLINK elements.
+ * @const
+ */
+Blockly.utils.dom.XLINK_NS = 'http://www.w3.org/1999/xlink';
+
 /**
  * Helper method for creating SVG elements.
  * @param {string} name Element's tag name.
diff --git a/core/warning.js b/core/warning.js
index 551bda5df..dae39898c 100644
--- a/core/warning.js
+++ b/core/warning.js
@@ -30,7 +30,7 @@ goog.require('Blockly.Bubble');
 goog.require('Blockly.Events');
 goog.require('Blockly.Events.Ui');
 goog.require('Blockly.Icon');
-goog.provide('Blockly.utils.dom');
+goog.require('Blockly.utils.dom');
 
 
 /**
diff --git a/core/workspace_drag_surface_svg.js b/core/workspace_drag_surface_svg.js
index fbf7c3245..6c8f567aa 100644
--- a/core/workspace_drag_surface_svg.js
+++ b/core/workspace_drag_surface_svg.js
@@ -90,7 +90,7 @@ Blockly.WorkspaceDragSurfaceSvg.prototype.createDom = function() {
       {
         'xmlns': Blockly.utils.dom.SVG_NS,
         'xmlns:html': Blockly.utils.dom.HTML_NS,
-        'xmlns:xlink': 'http://www.w3.org/1999/xlink',
+        'xmlns:xlink': Blockly.utils.dom.XLINK_NS,
         'version': '1.1',
         'class': 'blocklyWsDragSurface blocklyOverflowVisible'
       }, null);
diff --git a/core/zoom_controls.js b/core/zoom_controls.js
index 3c1e85e82..46566b441 100644
--- a/core/zoom_controls.js
+++ b/core/zoom_controls.js
@@ -216,7 +216,7 @@ Blockly.ZoomControls.prototype.createZoomOutSvg_ = function(rnd) {
         'clip-path': 'url(#blocklyZoomoutClipPath' + rnd + ')'
       },
       this.zoomOutGroup_);
-  zoomoutSvg.setAttributeNS('http://www.w3.org/1999/xlink', 'xlink:href',
+  zoomoutSvg.setAttributeNS(Blockly.utils.dom.XLINK_NS, 'xlink:href',
       ws.options.pathToMedia + Blockly.SPRITE.url);
 
   // Attach listener.
@@ -269,7 +269,7 @@ Blockly.ZoomControls.prototype.createZoomInSvg_ = function(rnd) {
         'clip-path': 'url(#blocklyZoominClipPath' + rnd + ')'
       },
       this.zoomInGroup_);
-  zoominSvg.setAttributeNS('http://www.w3.org/1999/xlink', 'xlink:href',
+  zoominSvg.setAttributeNS(Blockly.utils.dom.XLINK_NS, 'xlink:href',
       ws.options.pathToMedia + Blockly.SPRITE.url);
 
   // Attach listener.
@@ -321,7 +321,7 @@ Blockly.ZoomControls.prototype.createZoomResetSvg_ = function(rnd) {
         'clip-path': 'url(#blocklyZoomresetClipPath' + rnd + ')'
       },
       this.zoomResetGroup_);
-  zoomresetSvg.setAttributeNS('http://www.w3.org/1999/xlink', 'xlink:href',
+  zoomresetSvg.setAttributeNS(Blockly.utils.dom.XLINK_NS, 'xlink:href',
       ws.options.pathToMedia + Blockly.SPRITE.url);
 
   // Attach event listeners.