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-rw-r--r--src/core.js4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/core.js b/src/core.js
index 9efdc229e..c2dc4bc9b 100644
--- a/src/core.js
+++ b/src/core.js
@@ -5,6 +5,10 @@ var
// The deferred used on DOM ready
readyList,
+ // Support: IE9
+ // For `typeof xmlNode.method` instead of `xmlNode.method !== undefined`
+ core_strundefined = typeof undefined,
+
// Use the correct document accordingly with window argument (sandbox)
document = window.document,
location = window.location,