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@@ -1,3 +1,5 @@
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+* Ensure Selector.handlers.id finds the proper element even when it's not attached to the document. [jddalton]
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+
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 * Fix Position.within in IE. [jddalton]
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 * Fix the deprecated Position.withinIncludingScrollOffsets. [jddalton]

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@@ -467,16 +467,8 @@ Object.extend(Selector, {
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     id: function(nodes, root, id, combinator) {
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       var targetNode = $(id), h = Selector.handlers;
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       if (!targetNode) {
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-        var needsToSearch = false;
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-        // IE and Opera don't find elements by ID if they're not attached
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-        // to the document.
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-        if (Prototype.Browser.IE && (root.sourceIndex < 1 ||
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-         root === document)) {
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-          needsToSearch = true;        
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-        } else if (Prototype.Browser.Opera &&
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-         (root.compareDocumentPosition(document) & 1) === 1) {
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-          needsToSearch = true;   
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-        }
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+        var needsToSearch = root === document || root.sourceIndex < 1 ||
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+          !Element.descendantOf(root, document.documentElement);
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         if (needsToSearch) {
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           var nodes = root.getElementsByTagName('*');