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chromium/third_party/blink/web_tests/wpt_internal/css/css-ui/outline-focus-layer-ref.html 

<!DOCTYPE html>
<link rel="author" href="mailto:[email protected]">
<style>
body {
  margin: 50px;
  font-size: 0;
}
.outline {
  outline-style: auto;
}
#container {
  width: 200px;
  height: 200px;
}
#target {
  display: inline-block;
  width: 100px;
  height: 100px;
  background: #EEE;
  transform: translate(120px, 120px);
}
.spacer {
  display: inline-block;
  height: 50px;
  width: 200px;
}
</style>
<!--  -->
<div id="container" class="outline">
  <div class="spacer"></div>
  <div id="target"></div>
</div>