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Test Info: Warnings

<!DOCTYPE html>
<html class="reftest-wait">
<head>
<script>
window.addEventListener("load", async () => {
let a = document.createElement("iframe")
document.documentElement.appendChild(a)
let b = await a.contentWindow.clientInformation.storage.getDirectory()
let c = await b.getFileHandle("80e2d2c3-0712-4ccd-94b5-e2dd1732ea09", {"create": true})
let d = await c.createWritable({ })
setTimeout(async () => {
document.documentElement.removeAttribute("class");
await d.truncate(1);
}, 1000)
document.replaceChildren(document.documentElement, document.documentElement)
})
</script>
</head>
</html>