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diff --git a/test/wpt/tests/fetch/stale-while-revalidate/stale-script.html b/test/wpt/tests/fetch/stale-while-revalidate/stale-script.html
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--- /dev/null
+++ b/test/wpt/tests/fetch/stale-while-revalidate/stale-script.html
@@ -0,0 +1,59 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Tests Stale While Revalidate works for scripts</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/utils.js"></script>
+<body>
+<script>
+
+const request_token = token();
+const script_src = "./resources/stale-script.py?token=" + request_token;
+
+// The script above will call report() via a uniquely generated ID on the
+// subresource. If it is a cache hit, the ID will be the same and
+// |last_modified_count| won't be incremented.
+let last_modified;
+let last_modified_count = 0;
+function report(mod) {
+ if (last_modified == mod)
+ return;
+ last_modified = mod;
+ last_modified_count++;
+}
+
+let loadScript = async () => {
+ let script = document.createElement("script");
+ let script_loaded = new Promise(r => script.onload = r);
+ script.src = script_src;
+ document.body.appendChild(script);
+ await script_loaded;
+};
+
+promise_test(async t => {
+ await new Promise(r => window.onload = r);
+
+ await loadScript();
+ assert_equals(last_modified_count, 1, '(initial version loaded)');
+
+ await loadScript();
+ assert_equals(last_modified_count, 1, '(stale version loaded)');
+
+ // Query the server again and again. At some point it must have received the
+ // revalidation request. We poll, because we don't know when the revalidation
+ // will occur.
+ while(true) {
+ await new Promise(r => step_timeout(r, 25));
+ let response = await fetch(script_src + "&query");
+ let count = response.headers.get("Count");
+ if (count == '2')
+ break;
+ }
+
+ await loadScript();
+ assert_equals(last_modified_count, 2, '(revalidated version loaded)');
+
+}, 'Cache returns stale resource');
+
+</script>
+</body>