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Test Info:

<!doctype html>
<style>
* {
border-image-source: url(solidblue.gif);
}
</style>
<script>
window.addEventListener('load', () => {
const mtd = document.createElementNS('http://www.w3.org/1998/Math/MathML', 'mtd')
document.documentElement.appendChild(mtd)
})
</script>