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chromium/third_party/blink/web_tests/fast/table/fixed-table-with-small-percent-width.html 

<html>
    <table style="width:100%; background-color:red"><tr><td>

        <table style="background-color:blue"><tr><td>

            <table style="width:50%; background-color:green; table-layout:fixed"><tr><td>
                Content
            </td></tr></table>

        </td></tr></table>

    </td></tr></table>
</html>