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<!doctype html>
<meta charset="utf-8">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1646776">
<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
<link rel="author" href="https://mozilla.org" title="Mozilla">
<link rel="stylesheet" href="data:text/css,:root{background:green}">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<script>
// Note that script execution waits for the stylesheet above to be loaded.
window.t = async_test("Stylesheets that are already loaded in the document don't cause spurious error events on preloads");
let subdoc = document.createElement("iframe");
subdoc.srcdoc = `
<!doctype html>
<meta charset="utf-8">
<link rel="preload" as="style" href="data:text/css,:root{background:green}" onload="parent.t.done()" onerror="parent.t.step(() => parent.assert_unreached('should not error'))">
`;
document.body.appendChild(subdoc);
</script>
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