diff --git a/src/ol/canvas/canvas.js b/src/ol/canvas/canvas.js
index 4b62511cf7..71085aa721 100644
--- a/src/ol/canvas/canvas.js
+++ b/src/ol/canvas/canvas.js
@@ -5,9 +5,10 @@ goog.require('goog.dom.TagName');
 
 
 /**
- * @return {boolean} Is supported.
+ * @const
+ * @type {boolean} Is supported.
  */
-ol.canvas.isSupported = function() {
+ol.canvas.SUPPORTED = (function() {
   if (!('HTMLCanvasElement' in goog.global)) {
     return false;
   }
@@ -18,4 +19,4 @@ ol.canvas.isSupported = function() {
   } catch (e) {
     return false;
   }
-};
+})();
diff --git a/src/ol/geolocation.js b/src/ol/geolocation.js
index 99a0535382..30bc68304f 100644
--- a/src/ol/geolocation.js
+++ b/src/ol/geolocation.js
@@ -42,7 +42,7 @@ ol.Geolocation = function(opt_positionOptions) {
    */
   this.position_ = null;
 
-  if (ol.Geolocation.isSupported) {
+  if (ol.Geolocation.SUPPORTED) {
     goog.events.listen(
         this, ol.Object.getChangedEventType(ol.GeolocationProperty.PROJECTION),
         this.handleProjectionChanged_, false, this);
@@ -86,9 +86,10 @@ ol.Geolocation.prototype.handleProjectionChanged_ = function() {
 
 
 /**
+ * @const
  * @type {boolean} Is supported.
  */
-ol.Geolocation.isSupported = 'geolocation' in navigator;
+ol.Geolocation.SUPPORTED = 'geolocation' in navigator;
 
 
 /**
diff --git a/src/ol/map.js b/src/ol/map.js
index 4034fc9e5a..2c4ceea383 100644
--- a/src/ol/map.js
+++ b/src/ol/map.js
@@ -58,11 +58,11 @@ goog.require('ol.interaction.condition');
 goog.require('ol.layer.Layer');
 goog.require('ol.renderer.Map');
 goog.require('ol.renderer.canvas.Map');
-goog.require('ol.renderer.canvas.isSupported');
+goog.require('ol.renderer.canvas.SUPPORTED');
 goog.require('ol.renderer.dom.Map');
-goog.require('ol.renderer.dom.isSupported');
+goog.require('ol.renderer.dom.SUPPORTED');
 goog.require('ol.renderer.webgl.Map');
-goog.require('ol.renderer.webgl.isSupported');
+goog.require('ol.renderer.webgl.SUPPORTED');
 
 
 /**
@@ -858,17 +858,17 @@ ol.Map.createOptionsInternal = function(mapOptions) {
   for (i = 0; i < rendererHints.length; ++i) {
     rendererHint = rendererHints[i];
     if (rendererHint == ol.RendererHint.CANVAS) {
-      if (ol.ENABLE_CANVAS && ol.renderer.canvas.isSupported()) {
+      if (ol.ENABLE_CANVAS && ol.renderer.canvas.SUPPORTED) {
         rendererConstructor = ol.renderer.canvas.Map;
         break;
       }
     } else if (rendererHint == ol.RendererHint.DOM) {
-      if (ol.ENABLE_DOM && ol.renderer.dom.isSupported()) {
+      if (ol.ENABLE_DOM && ol.renderer.dom.SUPPORTED) {
         rendererConstructor = ol.renderer.dom.Map;
         break;
       }
     } else if (rendererHint == ol.RendererHint.WEBGL) {
-      if (ol.ENABLE_WEBGL && ol.renderer.webgl.isSupported()) {
+      if (ol.ENABLE_WEBGL && ol.renderer.webgl.SUPPORTED) {
         rendererConstructor = ol.renderer.webgl.Map;
         break;
       }
diff --git a/src/ol/renderer/canvas/canvasrenderer.js b/src/ol/renderer/canvas/canvasrenderer.js
index 85dc1d77a1..2eda861ddc 100644
--- a/src/ol/renderer/canvas/canvasrenderer.js
+++ b/src/ol/renderer/canvas/canvasrenderer.js
@@ -1,9 +1,10 @@
-goog.provide('ol.renderer.canvas.isSupported');
+goog.provide('ol.renderer.canvas.SUPPORTED');
 
 goog.require('ol.canvas');
 
 
 /**
- * @return {boolean} Is supported.
+ * @const
+ * @type {boolean} Is supported.
  */
-ol.renderer.canvas.isSupported = ol.canvas.isSupported;
+ol.renderer.canvas.SUPPORTED = ol.canvas.SUPPORTED;
diff --git a/src/ol/renderer/dom/domrenderer.js b/src/ol/renderer/dom/domrenderer.js
index 1d32334bfa..d57cfbf6d0 100644
--- a/src/ol/renderer/dom/domrenderer.js
+++ b/src/ol/renderer/dom/domrenderer.js
@@ -1,9 +1,8 @@
-goog.provide('ol.renderer.dom.isSupported');
-
-goog.require('goog.functions');
+goog.provide('ol.renderer.dom.SUPPORTED');
 
 
 /**
- * @return {boolean} Is supported.
+ * @const
+ * @type {boolean} Is supported.
  */
-ol.renderer.dom.isSupported = goog.functions.TRUE;
+ol.renderer.dom.SUPPORTED = true;
diff --git a/src/ol/renderer/webgl/webglrenderer.js b/src/ol/renderer/webgl/webglrenderer.js
index cf12c2ed7d..7dc4f06f25 100644
--- a/src/ol/renderer/webgl/webglrenderer.js
+++ b/src/ol/renderer/webgl/webglrenderer.js
@@ -1,9 +1,10 @@
-goog.provide('ol.renderer.webgl.isSupported');
+goog.provide('ol.renderer.webgl.SUPPORTED');
 
 goog.require('ol.webgl');
 
 
 /**
- * @return {boolean} Is supported.
+ * @const
+ * @type {boolean} Is supported.
  */
-ol.renderer.webgl.isSupported = ol.webgl.isSupported;
+ol.renderer.webgl.SUPPORTED = ol.webgl.SUPPORTED;
diff --git a/src/ol/webgl/webgl.js b/src/ol/webgl/webgl.js
index a3fae01859..83b6ccfc43 100644
--- a/src/ol/webgl/webgl.js
+++ b/src/ol/webgl/webgl.js
@@ -45,9 +45,10 @@ ol.webgl.getContext = function(canvas, opt_attributes) {
 
 
 /**
- * @return {boolean} Is supported.
+ * @const
+ * @type {boolean} Is supported.
  */
-ol.webgl.isSupported = function() {
+ol.webgl.SUPPORTED = (function() {
   if (!('WebGLRenderingContext' in goog.global)) {
     return false;
   }
@@ -57,4 +58,4 @@ ol.webgl.isSupported = function() {
   } catch (e) {
     return false;
   }
-};
+})();