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+++ b/dom/xul/test/test_bug403868.xhtml
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+<?xml version="1.0"?>
+<?xml-stylesheet href="chrome://global/skin" type="text/css"?>
+<?xml-stylesheet href="chrome://mochikit/content/tests/SimpleTest/test.css" type="text/css"?>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=403868
+-->
+<window title="Mozilla Bug 403868"
+ xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+ <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"/>
+
+ <!-- test results are displayed in the html:body -->
+ <body xmlns="http://www.w3.org/1999/xhtml">
+ <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=403868"
+ target="_blank">Mozilla Bug 403868</a>
+ <div id="content" style="display: none"/>
+ </body>
+
+ <!-- test code goes here -->
+ <script type="application/javascript"><![CDATA[
+
+ /** Test for Bug 403868 **/
+function createSpan(id, insertionPoint) {
+ var s = document.createElementNS("http://www.w3.org/1999/xhtml", "span");
+ s.id = id;
+ $("content").insertBefore(s, insertionPoint);
+ return s;
+}
+
+var s1a = createSpan("test1", null);
+is(document.getElementById("test1"), s1a,
+ "Only one span with id=test1 in the tree; should work!");
+
+var s2a = createSpan("test1", null);
+is(document.getElementById("test1"), s1a,
+ "Appending span with id=test1 doesn't change which one comes first");
+
+var s3a = createSpan("test1", s2a);
+is(document.getElementById("test1"), s1a,
+ "Inserting span with id=test1 not at the beginning; doesn't matter");
+
+var s4a = createSpan("test1", s1a);
+is(document.getElementById("test1"), s4a,
+ "Inserting span with id=test1 at the beginning changes which one is first");
+
+s4a.remove();
+is(document.getElementById("test1"), s1a,
+ "First-created span with id=test1 is first again");
+
+s1a.remove();
+is(document.getElementById("test1"), s3a,
+ "Third-created span with id=test1 is first now");
+
+// Start the id hashtable
+for (var i = 0; i < 256; ++i) {
+ document.getElementById("no-such-id-in-the-document" + i);
+}
+
+var s1b = createSpan("test2", null);
+is(document.getElementById("test2"), s1b,
+ "Only one span with id=test2 in the tree; should work!");
+
+var s2b = createSpan("test2", null);
+is(document.getElementById("test2"), s1b,
+ "Appending span with id=test2 doesn't change which one comes first");
+
+var s3b = createSpan("test2", s2b);
+is(document.getElementById("test2"), s1b,
+ "Inserting span with id=test2 not at the beginning; doesn't matter");
+
+var s4b = createSpan("test2", s1b);
+is(document.getElementById("test2"), s4b,
+ "Inserting span with id=test2 at the beginning changes which one is first");
+
+s4b.remove();
+is(document.getElementById("test2"), s1b,
+ "First-created span with id=test2 is first again");
+
+s1b.remove();
+is(document.getElementById("test2"), s3b,
+ "Third-created span with id=test2 is first now");
+
+ ]]></script>
+</window>