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Test Info:

<!doctype html>
<html class="test-wait">
<head>
<meta charset="utf-8">
<script>
document.addEventListener("DOMContentLoaded", () => {
requestAnimationFrame(() => {
setTimeout(() => {
document.execCommand("delete");
document.documentElement.removeAttribute("class");
}, 0);
document.execCommand("insertImage", false, "x");
});
document.execCommand("justifyCenter");
})
function onError() {
document.querySelector("s").before("BEFORE");
document.designMode = "on";
const img = document.querySelector("img");
img.innerHTML = "IMG";
getSelection().setBaseAndExtent(document.querySelector("kbd"), 0, img, 1);
}
</script>
</head>
<body><object onerror="onError()">
<s>
<img>
SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS
<kbd>
</kbd></s></object></body>
</html>