testing/web-platform/tests/html/semantics/forms/the-select-element/stylable-select/select-appearance-writing-mode-vertical-lr-ref.html


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<!DOCTYPE html>
<link rel=stylesheet href="resources/stylable-select-styles.css">

<style>
html {
  writing-mode: vertical-lr;
}
</style>

<div id=container class=stylable-select-container>
  <button class=stylable-select-button popovertarget=popover id=button>
    <span class=stylable-select-selectedoption>one</span>
    <div class=stylable-select-button-icon></div>
  </button>
  <div id=popover popover=auto anchor=container class=stylable-select-datalist>
    <div class=stylable-select-option>one</div>
    <div class=stylable-select-option>two</div>
  </div>
</div>

<script>
document.getElementById('popover').showPopover();
</script>