diff --git a/FWGL/Backend/JavaScript.hs b/FWGL/Backend/JavaScript.hs
--- a/FWGL/Backend/JavaScript.hs
+++ b/FWGL/Backend/JavaScript.hs
@@ -78,6 +78,7 @@
                 do element <- query $ toJSString "canvas"
                    eventSrc <- source handledEvents element
                    ctx <- JS.getCtx element
+                   JS.getExtension ctx $ toJSString "WEBGL_depth_texture"
                    (Just w) <- getProp "clientWidth" element >>= fromJSRef
                    (Just h) <- getProp "clientHeight" element >>= fromJSRef
                    focus element -- ... no
diff --git a/FWGL/Backend/JavaScript/WebGL/Raw.hs b/FWGL/Backend/JavaScript/WebGL/Raw.hs
--- a/FWGL/Backend/JavaScript/WebGL/Raw.hs
+++ b/FWGL/Backend/JavaScript/WebGL/Raw.hs
@@ -512,3 +512,6 @@
 
 foreign import javascript unsafe "$1.viewport($2, $3, $4, $5)"
         glViewport :: Ctx -> Int -> Int -> Int -> Int -> IO ()
+
+foreign import javascript unsafe "$1.getExtension($2)"
+        getExtension :: Ctx -> JSString -> IO (JSRef a)
diff --git a/fwgl-javascript.cabal b/fwgl-javascript.cabal
--- a/fwgl-javascript.cabal
+++ b/fwgl-javascript.cabal
@@ -1,5 +1,5 @@
 name:                fwgl-javascript
-version:             0.1.0.5
+version:             0.1.0.6
 synopsis:            FWGL GHCJS backend
 description:         FWGL GHCJS backend
 homepage:            https://github.com/ziocroc/FWGL