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diff --git a/layout/reftests/bugs/272646-1.xhtml b/layout/reftests/bugs/272646-1.xhtml
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+++ b/layout/reftests/bugs/272646-1.xhtml
@@ -0,0 +1,24 @@
+<?xml version="1.0"?>
+<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+ xmlns:nc="http://home.netscape.com/NC-rdf#"
+ title="insertBefore - Weirdness"
+ onload="var atab = document.createXULElement('tab'); atab.setAttribute('label','new'); let tabs = document.getElementById('tabs-id'); tabs.insertBefore(atab,tabs.allTabs[tabs.allTabs.length-1]);" >
+<tabbox>
+ <tabs id="tabs-id">
+ <tab label="foo" />
+ <tab label="bar" />
+ </tabs>
+ <tabpanels>
+ <tabpanel>
+ <vbox>
+ <label value="foo"/>
+ </vbox>
+ </tabpanel>
+ <tabpanel>
+ <vbox>
+ <label value="bar"/>
+ </vbox>
+ </tabpanel>
+ </tabpanels>
+</tabbox>
+</window>