From 41b840139985b5489414840be832a652f0940ba3 Mon Sep 17 00:00:00 2001
From: Mayhem <stepien.nicolas@gmail.com>
Date: Mon, 27 May 2013 20:13:29 +0200
Subject: [PATCH] Better, simpler visibility API. No need to polyfill for Gecko
 anymore.

---
 lib/polyfill.coffee | 24 +++++++-----------------
 1 file changed, 7 insertions(+), 17 deletions(-)

diff --git a/lib/polyfill.coffee b/lib/polyfill.coffee
index 0c098b212..5d9ddc124 100644
--- a/lib/polyfill.coffee
+++ b/lib/polyfill.coffee
@@ -3,20 +3,10 @@ Polyfill =
     Polyfill.visibility()
   visibility: ->
     # page visibility API
-    return if 'visibilityState' of document
-    if 'webkitVisibilityState' of document
-      prefix = 'webkit'
-    else if 'mozVisibilityState' of document
-      prefix = 'moz'
-    else
-      return
-
-    property = prefix + 'VisibilityState'
-    event    = prefix + 'visibilitychange'
-
-    d.visibilityState = d[property]
-    d.hidden = d.visibilityState is 'hidden'
-    $.on d, event, ->
-      d.visibilityState = d[property]
-      d.hidden = d.visibilityState is 'hidden'
-      $.event 'visibilitychange'
+    return unless 'webkitHidden' of document
+    Object.defineProperties HTMLDocument.prototype,
+      visibilityState:
+        get: -> @webkitVisibilityState
+      hidden:
+        get: -> @webkitHidden
+    $.on d, 'webkitvisibilitychange', -> $.event 'visibilitychange'