css/css-ui/outline-006.html

<!doctype html>
<html lang=en>
  <meta charset=utf-8>
  <title>CSS-UI test: outline-color:invert</title>
  <link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net">
  <meta name=flags content="">
  <meta name=assert content="outline-color:invert must do pixel-level color invertion OR fail to parse, in which case the initial value must be currentcolor">
  <link rel="match" href="reference/outline-006-ref.html">
  <link rel=help href="https://drafts.csswg.org/css-ui-3/#outline-props">
<style>
body > div {
  width: 100px;
  height: 100px;
  display: table-cell; /* Make a BFC */
  background: rgb(255,127,255); /* inverse of green (rgb(0,128,0)) */
}
div > div {
  color: green;
  background: green;
  margin: 25px;
  width: 50px;
  height: 50px;
  outline: solid 25px;
  outline-color: invert;
}

</style>

  <p>Test passes if there is a filled green square and <strong>no pink</strong>.</p>
  <div><div></div></div>