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<!doctype html>
<meta charset=utf-8>
<style>
div {
position: relative;
}
svg {
display: block;
margin: auto;
}
</style>
<body>
<div>
viewport='0 0 100 200'>
<rect x='0' y='100' width='100' height='100' fill='purple'>
</rect>
</svg>
</div>
</body>