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chromium/third_party/blink/web_tests/fast/borders/outline-rounded-border.html 

<!DOCTYPE html>
<style>

div {
  display: inline-block;
  width: 200px;
  height: 140px;
  border-radius: 70px;
  background-color: yellow;
  outline: 20px green;
  margin: 20px;
}

</style>

<div style="outline-style: solid;"></div>
<div style="outline-style: dashed;"></div>
<div style="outline-style: dotted;"></div>
<div style="outline-style: double;"></div>
<div style="outline-style: inset;"></div>
<div style="outline-style: outset;"></div>
<div style="outline-style: groove;"></div>
<div style="outline-style: ridge;"></div>