From 9eaf16576c46c3fcd422fd687a8a66484be1e724 Mon Sep 17 00:00:00 2001
From: Mayhem <stepien.nicolas@gmail.com>
Date: Sun, 10 Nov 2013 04:20:00 +0100
Subject: [PATCH] Better return guard for the page visibility polyfill.

---
 lib/polyfill.coffee | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/polyfill.coffee b/lib/polyfill.coffee
index 0ad7c1fe8..8298d63ae 100644
--- a/lib/polyfill.coffee
+++ b/lib/polyfill.coffee
@@ -27,7 +27,7 @@ Polyfill =
       cb new Blob [ui8a], type: 'image/png'
   visibility: ->
     # page visibility API
-    return unless 'webkitHidden' of document
+    return if 'visibilityState' of d
     Object.defineProperties HTMLDocument.prototype,
       visibilityState:
         get: -> @webkitVisibilityState