chromium/third_party/blink/web_tests/external/wpt/css/css-sizing/intrinsic-percent-replaced-009-ref.html

<!doctype html>
<title>CSS test reference</title>
<style>
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  width: 100%;
  height: 100%;
}

body {
  padding: 20px;
  position: relative;
}

.parent {
  border: 3px solid green;
  position: absolute;
  height: 60vh;
}

.parent img {
  height: calc(60vh - 6px);
}
</style>
<div class="parent">
  <img src="/images/blue96x96.png">
</div>