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div { border: medium solid blue }
span { background: #9090ff; }
span.test::before {
white-space: pre;
content: "\A";
<p>This document is in <span id="mode"></span> mode.</p>
<p>This is a test for the line height quirk which is present in limited-quirks mode <b>and</b> quirks mode:</p>
<div><span style="font-size: 50%">hello<br>hello</span></div>
<p>This is a test for the hashless hex color quirk which is present in quirks mode <b>only</b>:</p>
<div style="background-color: 9090ff">test</div>
document.getElementById("mode").innerText = document.compatMode;