diff --git a/src/util.js b/src/util.js
index b0739ec3a..93bd36b55 100644
--- a/src/util.js
+++ b/src/util.js
@@ -174,57 +174,6 @@ var Util = (function UtilClosure() {
   return Util;
 })();
 
-// optimised CSS custom property getter/setter
-var CustomStyle = (function CustomStyleClosure() {
-
-  // As noted on: http://www.zachstronaut.com/posts/2009/02/17/
-  //              animate-css-transforms-firefox-webkit.html
-  // in some versions of IE9 it is critical that ms appear in this list
-  // before Moz
-  var prefixes = ['ms', 'Moz', 'Webkit', 'O'];
-  var _cache = { };
-
-  function CustomStyle() {
-  }
-
-  CustomStyle.getProp = function get(propName, element) {
-    // check cache only when no element is given
-    if (arguments.length == 1 && typeof _cache[propName] == 'string') {
-      return _cache[propName];
-    }
-
-    element = element || document.documentElement;
-    var style = element.style, prefixed, uPropName;
-
-    // test standard property first
-    if (typeof style[propName] == 'string') {
-      return (_cache[propName] = propName);
-    }
-
-    // capitalize
-    uPropName = propName.charAt(0).toUpperCase() + propName.slice(1);
-
-    // test vendor specific properties
-    for (var i = 0, l = prefixes.length; i < l; i++) {
-      prefixed = prefixes[i] + uPropName;
-      if (typeof style[prefixed] == 'string') {
-        return (_cache[propName] = prefixed);
-      }
-    }
-
-    //if all fails then set to undefined
-    return (_cache[propName] = 'undefined');
-  }
-
-  CustomStyle.setProp = function set(propName, element, str) {
-    var prop = this.getProp(propName);
-    if (prop != 'undefined')
-      element.style[prop] = str;
-  }
-
-  return CustomStyle;
-})();
-
 var PDFStringTranslateTable = [
   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
   0x2D8, 0x2C7, 0x2C6, 0x2D9, 0x2DD, 0x2DB, 0x2DA, 0x2DC, 0, 0, 0, 0, 0, 0, 0,
diff --git a/web/viewer.js b/web/viewer.js
index 9f477f3a7..77bbc2c0e 100644
--- a/web/viewer.js
+++ b/web/viewer.js
@@ -1022,6 +1022,57 @@ var DocumentOutlineView = function documentOutlineView(outline) {
   }
 };
 
+// optimised CSS custom property getter/setter
+var CustomStyle = (function CustomStyleClosure() {
+
+  // As noted on: http://www.zachstronaut.com/posts/2009/02/17/
+  //              animate-css-transforms-firefox-webkit.html
+  // in some versions of IE9 it is critical that ms appear in this list
+  // before Moz
+  var prefixes = ['ms', 'Moz', 'Webkit', 'O'];
+  var _cache = { };
+
+  function CustomStyle() {
+  }
+
+  CustomStyle.getProp = function get(propName, element) {
+    // check cache only when no element is given
+    if (arguments.length == 1 && typeof _cache[propName] == 'string') {
+      return _cache[propName];
+    }
+
+    element = element || document.documentElement;
+    var style = element.style, prefixed, uPropName;
+
+    // test standard property first
+    if (typeof style[propName] == 'string') {
+      return (_cache[propName] = propName);
+    }
+
+    // capitalize
+    uPropName = propName.charAt(0).toUpperCase() + propName.slice(1);
+
+    // test vendor specific properties
+    for (var i = 0, l = prefixes.length; i < l; i++) {
+      prefixed = prefixes[i] + uPropName;
+      if (typeof style[prefixed] == 'string') {
+        return (_cache[propName] = prefixed);
+      }
+    }
+
+    //if all fails then set to undefined
+    return (_cache[propName] = 'undefined');
+  }
+
+  CustomStyle.setProp = function set(propName, element, str) {
+    var prop = this.getProp(propName);
+    if (prop != 'undefined')
+      element.style[prop] = str;
+  }
+
+  return CustomStyle;
+})();
+
 var TextLayerBuilder = function textLayerBuilder(textLayerDiv) {
   this.textLayerDiv = textLayerDiv;