Codebase Browser
chromium
Go to App

chromium/third_party/blink/web_tests/printing/quirks-percentage-height.html 

<script>
if (window.testRunner)
    testRunner.setPrinting();
</script>
<body style="margin: 0;">
    <div style="height: 50%; width: 50%; border: 5px solid salmon;"></div>
</body>