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Test Info:

<!doctype html>
<html class="test-wait">
<head>
<meta charset="utf-8">
<style>
dir {
animation: kf, 0s infinite paused;
}
svg {
animation-name: kf;
}
@keyframes kf {}
</style>
<script>
let dir;
// animationend for <svg> and <dir> may be fired before "DOMContentLoaded".
// Therefore, let's start to listen them immediately.
const waitForAnimationEnd = new Promise(resolve => {
let count = 0;
function onAnimationEnd() {
window.find("AAAAAAAAAA");
document.execCommand("forwardDelete");
count++;
function getRemainingEventCount(event) {
if (count >= 2) {
return 0;
}
if (event.target.tagName == "DIR") {
return 0;
}
// If `animationend` is delayed and `<dir>` has already been removed,
// `animationend` for it is never fired anymore.
return dir && !dir.isConnected ? 0 : 1;
}
if (!getRemainingEventCount()) {
window.removeEventListener("animationend", onAnimationEnd);
resolve();
}
}
window.addEventListener("animationend", onAnimationEnd);
});
document.addEventListener("DOMContentLoaded", async () => {
dir = document.querySelector("dir");
window.find("A");
document.execCommand("insertHTML", false, "AAAAAAAAAAAAAAAA");
dir.addEventListener("DOMNodeRemoved", event => {
dir.remove();
});
window.find("A");
document.execCommand("delete");
await waitForAnimationEnd;
document.documentElement.removeAttribute("class");
});
</script>
</head>
<body>
<svg>
<s></s>
<dir contenteditable>
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
</dir>
</svg>
</body>
</html>