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chromium/third_party/blink/web_tests/wpt_internal/infrastructure/wpt-format-print.html 

<!DOCTYPE html>
<title>Check that the default WPT print format is set.</title>
<link rel="match" href="wpt-format-ref.html">
<style>
    body {
        margin: 0pt;
    }
    div {
        width: 288pt;
        height: 144pt;
        background-color: green;
        -webkit-print-color-adjust: exact;
    }
</style>
<div></div>