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Test Info:

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<style>
mask, li {
float: inline-start;
animation-name: kf0;
}
@keyframes kf0 {}
</style>
<script>
document.addEventListener("DOMContentLoaded", () => {
window.focus();
document.designMode = "on";
document.onpointerlockerror = onPointerLockErrorOrAnimationStart;
const mask = document.querySelector("mask");
mask.requestPointerLock();
mask.prepend(document.querySelector("table"));
});
function onPointerLockErrorOrAnimationStart() {
document.execCommand("underline");
document.execCommand("delete");
onanimationstart = onPointerLockErrorOrAnimationStart;
try {
getSelection().setBaseAndExtent(
document.querySelector("li"), 0,
document.querySelector("thead"), 0
);
} catch (e) {}
}
</script>
<body><svg>
<mask>
<clipPath>
</clipPath></mask></svg><sup>
AA
<li>
<br></li></sup><table>
<thead>
</thead></table>