From 669312f49950ae1b8bc2381234c7e4fed086cd86 Mon Sep 17 00:00:00 2001
From: Brandon Aaron <hello.brandon@aaron.sh>
Date: Thu, 10 Jul 2014 11:22:35 -0400
Subject: [PATCH] Use the font-size of the element if the font-size of the
 parent is 0 and use 16 if both are 0 (applies when deltaMode is 1).

---
 ChangeLog.md         | 4 ++++
 jquery.mousewheel.js | 5 +++--
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/ChangeLog.md b/ChangeLog.md
index 7a00439c3..77cceacdd 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,5 +1,9 @@
 # Mouse Wheel ChangeLog
 
+## 3.1.12
+
+* Fix possible 0 value for line height when in delta mode 1
+
 ## 3.1.11
 
 * Fix version number for package managers...
diff --git a/jquery.mousewheel.js b/jquery.mousewheel.js
index a7038e602..b59e4d866 100755
--- a/jquery.mousewheel.js
+++ b/jquery.mousewheel.js
@@ -61,11 +61,12 @@
         },
 
         getLineHeight: function(elem) {
-            var $parent = $(elem)['offsetParent' in $.fn ? 'offsetParent' : 'parent']();
+            var $elem = $(elem),
+                $parent = $elem['offsetParent' in $.fn ? 'offsetParent' : 'parent']();
             if (!$parent.length) {
                 $parent = $('body');
             }
-            return parseInt($parent.css('fontSize'), 10);
+            return parseInt($parent.css('fontSize'), 10) || parseInt($elem.css('fontSize'), 10) || 16;
         },
 
         getPageHeight: function(elem) {