From 34f88e94fcc75d212a0076124c8d550bb9f7095d Mon Sep 17 00:00:00 2001
From: Chris Rebert <code@rebertia.com>
Date: Mon, 5 Jan 2015 14:47:33 -0800
Subject: [PATCH] window.Document doesn't exist in IE8

---
 js/tooltip.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/js/tooltip.js b/js/tooltip.js
index b47c010f37..5830c4af19 100644
--- a/js/tooltip.js
+++ b/js/tooltip.js
@@ -52,7 +52,7 @@
     this.options   = this.getOptions(options)
     this.$viewport = this.options.viewport && $(this.options.viewport.selector || this.options.viewport)
 
-    if (this.$element[0] instanceof window.Document && !this.options.selector) {
+    if (this.$element[0] instanceof document.constructor && !this.options.selector) {
       throw new Error('`selector` option must be specified when initializing ' + this.type + ' on the window.document object!');
     }