nored.">
<style>
    .test {
        width: 32px;
        height: 32px;
        background-color: red;
    }
</style>
<body>
    <p>Test passes if you see a rainbow square, and not a red one.</p>
    <div class="test"><img src="support/invalid-unknown-ancillary.png" alt=""></div>
</body>
</html>