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<!DOCTYPE html>
<link rel=stylesheet href="resources/customizable-select-styles.css">
<style>
html {
writing-mode: vertical-lr;
}
</style>
<div class=customizable-select-button id=button>
<div class=customizable-select-selectedcontent>one</div>
</div>
<div id=popover popover=auto anchor=button class=customizable-select-popover>
<div class="customizable-select-option selected">one</div>
<div class=customizable-select-option>two</div>
</div>
<script>
document.getElementById('popover').showPopover();
</script>