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chromium/third_party/blink/web_tests/external/wpt/html/rendering/non-replaced-elements/the-hr-element-0/color-ref.html 

<!doctype html>
<meta charset=utf-8>
<style>
.hr {
  color: gray;
  border-style: inset;
  border-width: 1px;
  margin: 0.5em auto;
}

.green {
  color: green;
}

.no-inset {
  border-style: solid;
}
</style>
<div class='hr'></div>
<div class='hr no-inset'></div>
<div class='hr no-inset'></div>
<div class='hr green no-inset'></div>