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chromium/third_party/blink/web_tests/svg/foreignObject/svg-document-in-html-document.svg 

<svg xmlns="http://www.w3.org/2000/svg">
<foreignObject width="300" height="100">
    <html xmlns="http://www.w3.org/1999/xhtml">
        <p style="margin-top: 0;">Test from HTML in foreignObject</p>
        <svg xmlns="http://www.w3.org/2000/svg">
            <rect width="20" height="20" fill="green"/>
            <text y="50">Test from SVG in HTML in foreignObject</text>
        </svg>
    </html>
</foreignObject>
</svg>