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chromium/third_party/blink/web_tests/external/wpt/css/css-display/display-contents-block-002.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Display: margin collapsing through display:contents</title>
<link rel="author" title="Rune Lillesveen" href="mailto:[email protected]">
<link rel="help" href="https://drafts.csswg.org/css-display-3/#valdef-display-contents">
<link rel="match" href="display-contents-block-002-ref.html">
<style>
    #outer { margin-top: 100px }
    #inner { margin-top: 300px }
    #contents {
        display: contents;
        margin-top: 2000px
    }
</style>
<p>You should see the word PASS with a 300px top margin below.</p>
<div id="outer">
    <div id="contents">
        <div id="inner">PASS</div>
    </div>
</div>