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chromium/third_party/blink/web_tests/external/wpt/css/css-fonts/font-size-zero-1-notref.html 

<!DOCTYPE HTML>
<title>CSS Test Reference</title>
<link rel="author" title="L. David Baron" href="https://dbaron.org/">
<link rel="author" title="Mozilla" href="http://www.mozilla.org/">
<style>
/* spec ambiguous whether font-size-adjust influences line-height: normal */
body { line-height: 1.2 }
</style>

<p>before</p>
<p>zero</p>
<p>after</p>