sousa-gecko/testing/web-platform/tests/css/css-display/display-contents-inline-002.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Display: display:contents in inline layout should affect style of descendants</title>
<link rel="author" title="Martin Robinson" href="mailto:mrobinson@igalia.com">
<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
<link rel="help" href="https://drafts.csswg.org/css-display-3/#valdef-display-contents">
<link rel="match" href="display-contents-pass-no-red-ref.html">
<style>
    #contents {
        display: contents;
        color: black;
    }
    .red { color: red; }
</style>
<p>You should see the word PASS and no red below.</p>
<span>
    P<span class="red"><div id="contents">AS</div></span>S
</span>