LayoutTests/fast/css/line-height-calc-zoomed.html

<!DOCTYPE html>
<html>
<style>
.container {
  zoom: 5;
  font: 10px/1 Ahem;
  width: 20px;
  background-color: green;
  color: green;
  line-height: max(20px, 50%);
}
</style>
<body>
  <p>Test passes if there is a filled green square.</p>
  <div class="container">x</div>
</body>
</html>