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diff --git a/js/xpconnect/tests/mochitest/file_doublewrappedcompartments.html b/js/xpconnect/tests/mochitest/file_doublewrappedcompartments.html
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+++ b/js/xpconnect/tests/mochitest/file_doublewrappedcompartments.html
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+<html>
+ <head>
+ <script>
+ // We want to put an expando on the object, but we want this object
+ // to be wrapped in other compartments. This means that the expando
+ // must implement precreate, which happens (in general) for nodes.
+ // So we just do a cyclic reference to the document body.
+ window.expando = document.documentElement;
+ </script>
+ </head>