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chromium/third_party/blink/web_tests/external/wpt/html/rendering/replaced-elements/images/space-ref.html 

<!doctype html>
<meta charset=utf-8>
<title>img hspace/vspace - reference</title>
<style>
span { background: blue; }
</style>
<div style=width:400px;>
<p><span><img src=/images/green.png></span>
<p><span><img src=/images/green.png style="margin: 0 10px"></span>
<p><span><img src=/images/green.png style="margin: 10px 0"></span>
<p><span><img src=/images/green.png style="margin: 0 10%"></span>
<p><span><img src=/images/green.png style="margin: 10% 0"></span>
</div>