diff --git a/src/ol/dom/dom.js b/src/ol/dom/dom.js
index 9b9dea6990..0692e4cfe9 100644
--- a/src/ol/dom/dom.js
+++ b/src/ol/dom/dom.js
@@ -12,80 +12,98 @@ goog.require('goog.vec.Mat4');
 
 
 /**
- * http://caniuse.com/#feat=transforms2d
- * http://caniuse.com/#feat=transforms3d
  * @enum {boolean}
  */
 ol.dom.BrowserFeature = {
-  CAN_USE_CSS_TRANSFORM: (
-      /**
-       * Detect 2d transform.
-       * Adapted from http://stackoverflow.com/q/5661671/130442
-       * @return {boolean}
-       */
-      function() {
-        if (!window.getComputedStyle) {
-          // this browser is ancient
-          return false;
-        }
-        var el = goog.dom.createElement(goog.dom.TagName.P),
-            has2d,
-            transforms = {
-              'webkitTransform': '-webkit-transform',
-              'OTransform': '-o-transform',
-              'msTransform': '-ms-transform',
-              'MozTransform': '-moz-transform',
-              'transform': 'transform'
-            };
-        goog.dom.appendChild(document.body, el);
-        for (var t in transforms) {
-          if (t in el.style) {
-            el.style[t] = 'translate(1px,1px)';
-            has2d = window.getComputedStyle(el).getPropertyValue(transforms[t]);
-          }
-        }
-        goog.dom.removeNode(el);
-
-        return (goog.isDefAndNotNull(has2d) && has2d.length > 0 &&
-            has2d !== 'none');
-      })(),
-  CAN_USE_CSS_TRANSFORM3D: (
-      /**
-       * Detect 3d transform.
-       * Adapted from http://stackoverflow.com/q/5661671/130442
-       * @return {boolean}
-       */
-      function() {
-        if (!window.getComputedStyle) {
-          // this browser is ancient
-          return false;
-        }
-        var el = goog.dom.createElement(goog.dom.TagName.P),
-            has3d,
-            transforms = {
-              'webkitTransform': '-webkit-transform',
-              'OTransform': '-o-transform',
-              'msTransform': '-ms-transform',
-              'MozTransform': '-moz-transform',
-              'transform': 'transform'
-            };
-        goog.dom.appendChild(document.body, el);
-        for (var t in transforms) {
-          if (t in el.style) {
-            el.style[t] = 'translate3d(1px,1px,1px)';
-            has3d = window.getComputedStyle(el).getPropertyValue(transforms[t]);
-          }
-        }
-        goog.dom.removeNode(el);
-
-        return (goog.isDefAndNotNull(has3d) && has3d.length > 0 &&
-            has3d !== 'none');
-      })(),
   USE_MS_MATRIX_TRANSFORM: ol.LEGACY_IE_SUPPORT && ol.IS_LEGACY_IE,
   USE_MS_ALPHA_FILTER: ol.LEGACY_IE_SUPPORT && ol.IS_LEGACY_IE
 };
 
 
+/**
+ * Detect 2d transform.
+ * Adapted from http://stackoverflow.com/q/5661671/130442
+ * http://caniuse.com/#feat=transforms2d
+ * @return {boolean}
+ */
+ol.dom.canUseCssTransform = function() {
+  goog.asserts.assert(!goog.isNull(document.body));
+  var canUseCssTransform;
+  if (!goog.isDef(canUseCssTransform)) {
+    canUseCssTransform = (function() {
+      if (!goog.global.getComputedStyle) {
+        // this browser is ancient
+        return false;
+      }
+      var el = goog.dom.createElement(goog.dom.TagName.P),
+          has2d,
+          transforms = {
+            'webkitTransform': '-webkit-transform',
+            'OTransform': '-o-transform',
+            'msTransform': '-ms-transform',
+            'MozTransform': '-moz-transform',
+            'transform': 'transform'
+          };
+      goog.dom.appendChild(document.body, el);
+      for (var t in transforms) {
+        if (t in el.style) {
+          el.style[t] = 'translate(1px,1px)';
+          has2d = goog.global.getComputedStyle(el).getPropertyValue(
+              transforms[t]);
+        }
+      }
+      goog.dom.removeNode(el);
+
+      return (goog.isDefAndNotNull(has2d) && has2d.length > 0 &&
+          has2d !== 'none');
+    }());
+  }
+  return canUseCssTransform;
+};
+
+
+/**
+ * Detect 3d transform.
+ * Adapted from http://stackoverflow.com/q/5661671/130442
+ * http://caniuse.com/#feat=transforms3d
+ * @return {boolean}
+ */
+ol.dom.canUseCssTransform3D = function() {
+  goog.asserts.assert(!goog.isNull(document.body));
+  var canUseCssTransform3D;
+  if (!goog.isDef(canUseCssTransform3D)) {
+    canUseCssTransform3D = (function() {
+      if (!goog.global.getComputedStyle) {
+        // this browser is ancient
+        return false;
+      }
+      var el = goog.dom.createElement(goog.dom.TagName.P),
+          has3d,
+          transforms = {
+            'webkitTransform': '-webkit-transform',
+            'OTransform': '-o-transform',
+            'msTransform': '-ms-transform',
+            'MozTransform': '-moz-transform',
+            'transform': 'transform'
+          };
+      goog.dom.appendChild(document.body, el);
+      for (var t in transforms) {
+        if (t in el.style) {
+          el.style[t] = 'translate3d(1px,1px,1px)';
+          has3d = goog.global.getComputedStyle(el).getPropertyValue(
+              transforms[t]);
+        }
+      }
+      goog.dom.removeNode(el);
+
+      return (goog.isDefAndNotNull(has3d) && has3d.length > 0 &&
+          has3d !== 'none');
+    }());
+  }
+  return canUseCssTransform3D;
+};
+
+
 /**
  * @param {Element} element Element.
  * @param {string} value Value.
@@ -183,7 +201,7 @@ ol.dom.transformElement2D =
   // using matrix() causes gaps in Chrome and Firefox on Mac OS X, so prefer
   // matrix3d()
   var i;
-  if (ol.dom.BrowserFeature.CAN_USE_CSS_TRANSFORM3D) {
+  if (ol.dom.canUseCssTransform3D()) {
     var value3D;
 
     if (goog.isDef(opt_precision)) {
@@ -197,7 +215,7 @@ ol.dom.transformElement2D =
       value3D = transform.join(',');
     }
     ol.dom.setTransform(element, 'matrix3d(' + value3D + ')');
-  } else if (ol.dom.BrowserFeature.CAN_USE_CSS_TRANSFORM) {
+  } else if (ol.dom.canUseCssTransform()) {
     /** @type {Array.<number>} */
     var transform2D = [
       goog.vec.Mat4.getElement(transform, 0, 0),