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diff --git a/testing/web-platform/tests/preload/preload-link-cached-stylesheet-different-doc.html b/testing/web-platform/tests/preload/preload-link-cached-stylesheet-different-doc.html
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+++ b/testing/web-platform/tests/preload/preload-link-cached-stylesheet-different-doc.html
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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>