<script type="text/javascript" src="../tests/update_options.js"></script>
<script type="text/javascript" src="../tests/update_while_panning.js"></script>
<script type="text/javascript" src="../tests/utils_test.js"></script>
+ <script type="text/javascript" src="../tests/visibility.js"></script>
<style type="text/css">
.pass .outcome {