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chromium/third_party/blink/web_tests/external/wpt/css/css-backgrounds/box-shadow-calc-ref.html 

<!DOCTYPE html>
<style type="text/css">
div {
  width: 100px;
  height: 100px;
  background-color: blue;
  box-shadow: 26px 43px 60px black;
}
</style>
<div>
</div>