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@@ -1,3 +1,5 @@
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+* Fix Position.within in IE. [jddalton]
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+
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 * Fix the deprecated Position.withinIncludingScrollOffsets. [jddalton]
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 * Consolidate document.body getOffsetParent checks into a private utility method. [staaky, jddalton]

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@@ -625,6 +625,9 @@ Object.extend(Element.Methods, (function() {
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      (element.sourceIndex < 1 || !element.offsetParent)) {
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       return false;
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     }
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+    if (element.sourceIndex > 0 && element.offsetParent === document.documentElement) {
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+      return element.offsetParent;
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+    }
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     return op;
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   }
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