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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<style>
rect {
fill: red;
};
</style>
</head>
<body>
<div id='container'>
<svg id="svg" xmlns="http://www.w3.org/2000/svg" width="200" height="200" viewBox="0 0 200 200">
<rect x="0" y="0" width="200" height="200"></rect>
<g is="x-rect"></g>
</svg>
</div>
<script type="text/javascript">
<![CDATA[
document.registerElement("x-rect", {
extends: "g",
prototype: {
__proto__: SVGRectElement.prototype,
createdCallback: function() {
this.createShadowRoot();
this.shadowRoot.innerHTML =
'<style>rect { fill: blue; }</style><rect width="100" height="100" x="0" y="0"></rect>';
}
}
});
]]>
</script>
</body>
</html>
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