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diff --git a/layout/reftests/bugs/512410-ref.html b/layout/reftests/bugs/512410-ref.html
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+++ b/layout/reftests/bugs/512410-ref.html
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+<html><head>
+<title>Bug 506481 -  selected item not showing in listbox box</title>
+</head><body>
+<select multiple="multiple">
+<option>option 0</option><option>option 1</option><option>option 2</option><option>option 3</option><option>option 4</option><option>option 5</option><option>option 6</option><option>option 7</option><option>option 8</option><option>option 9</option><option>option 10</option><option>option 11</option><option>option 12</option><option>option 13</option><option>option 14</option><option>option 15</option><option>option 16</option><option>option 17</option><option>option 18</option><option>option 19</option><option>option 20</option><option>option 21</option><option>option 22</option><option>option 23</option><option>option 24</option><option>option 25</option><option>option 26</option><option>option 27</option><option>option 28</option><option>option 29</option><option>option 30</option><option>option 31</option><option>option 32</option><option>option 33</option><option>option 34</option><option>option 35</option><option>option 36</option><option>option 37</option><option>option 38</option><option>option 39</option><option>option 40</option><option>option 41</option><option>option 42</option><option>option 43</option><option>option 44</option><option>option 45</option><option>option 46</option><option>option 47</option><option>option 48</option><option>option 49</option><option>option 50</option>
+</select>
+<select multiple="multiple">
+<option>option 0</option><option>option 1</option><option>option 2</option><option>option 3</option><option>option 4</option><option>option 5</option><option>option 6</option><option>option 7</option><option>option 8</option><option>option 9</option><option>option 10</option><option>option 11</option><option>option 12</option><option>option 13</option><option>option 14</option><option>option 15</option><option>option 16</option><option>option 17</option><option>option 18</option><option>option 19</option><option>option 20</option><option>option 21</option><option>option 22</option><option>option 23</option><option>option 24</option><option>option 25</option><option>option 26</option><option>option 27</option><option>option 28</option><option>option 29</option><option>option 30</option><option>option 31</option><option>option 32</option><option>option 33</option><option>option 34</option><option>option 35</option><option>option 36</option><option>option 37</option><option>option 38</option><option>option 39</option><option>option 40</option><option>option 41</option><option>option 42</option><option>option 43</option><option>option 44</option><option>option 45</option><option>option 46</option><option>option 47</option><option>option 48</option><option>option 49</option><option>option 50</option>
+</select>
+
+<script>
+var sel = document.getElementsByTagName('select')
+sel[0].selectedIndex=50
+sel[1].selectedIndex=50
+document.body.offsetHeight;
+</script>
+</body></html>