chromium/third_party/blink/web_tests/svg/css/max-width.html

<style>
    svg { max-width: 100px; }
</style>
<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="400px" height="400px" viewBox="0 0 400 400">
    <rect x="0" y="0" width="400" height="400"/>
</svg>