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Test Info:

<!doctype html>
<html class="reftest-wait">
<head>
<meta charset="utf-8">
<meta name="timeout" content="long">
<script>
"use strict";
addEventListener("load", async () => {
const iframe = document.querySelector("iframe");
iframe.focus();
const srcdoc = `
<div contenteditable>
<span contenteditable="false">
<span autofocus contenteditable="plaintext-only"></span>
</span>
</div>
<input>`;
for (let i = 0; i < 30; i++) {
iframe.srcdoc = "";
const waitForLoad = new Promise(resolve => {
iframe.addEventListener("load", () => {
const editingHost = iframe.contentDocument.querySelector("div[contenteditable]");
const nonEditableSpan = editingHost.querySelector("span[contenteditable=false]");
editingHost.focus();
const input = iframe.contentDocument.querySelector("input");
input.appendChild(nonEditableSpan);
resolve();
}, {once: true});
});
iframe.srcdoc = srcdoc;
await waitForLoad;
}
document.documentElement.removeAttribute("class");
}, {once: true});
</script>
</head>
<body>
<iframe></iframe>
</body>
</html>