chromium/third_party/blink/web_tests/external/wpt/css/css-ui/outline-007.html

<!doctype html>
<html lang=en>
  <meta charset=utf-8>
  <title>CSS-UI test: outline-style: auto</title>
  <link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net">
  <meta name=flags content="">
  <meta name=assert content="outline-style:auto allows the UA to display any outline it wants, but it must display something.">
  <link rel="mismatch" href="reference/outline-007-ref.html">
  <link rel=help href="https://drafts.csswg.org/css-ui-3/#outline-props">
<style>
div {
  width: 100px;
  height: 100px;
  outline-style: auto;

  /* These values may be ignored by the UA, but just in case they are not,
     set them to something that does not result in the outline being invisible */
  outline-width: 5px;
  outline-color: green;
}

</style>

  <p>Test passes if there is an outlined box below. The outline may be any shape or color so long as it is visible.</p>
  <div></div>