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chromium/third_party/blink/web_tests/external/wpt/css/css-backgrounds/border-radius-012-ref.html 

<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mailto:[email protected]">
<style>
  .spacer { display:inline-block; width:20px; }
</style>
<p>There should be two good-looking arcs below.</p>
<div style="font-size:40px; line-height:100px;">
  <span style="border:20px solid; border-radius:40px; border-right:none; border-top-right-radius:0; border-bottom-right-radius:0;">
    <span class="spacer"></span></span>
  <br>
  <span style="border:20px solid; border-radius:40px; border-left:none; border-top-left-radius:0; border-bottom-left-radius:0;">
    <span class="spacer"></span></span>
</div>