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<!DOCTYPE html>
<title>Switching animated target to an unknown element</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<svg height="0">
<path id="path">
<animateMotion/>
</path>
<unknown id="unknown"></unknown>
</svg>
<script>
async_test(t => {
let path = document.getElementById("path");
let anim = path.firstElementChild;
t.step_timeout(() => {
path.appendChild(document.createElementNS('http://www.w3.org/2000/svg', 'animateMotion'));
anim.setAttributeNS('http://www.w3.org/1999/xlink', 'xlink:href', '#unknown');
requestAnimationFrame(t.step_func(() => {
requestAnimationFrame(t.step_func_done());
}));
});
});
</script>
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