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diff --git a/testing/web-platform/tests/long-animation-frame/tentative/loaf-stream.html b/testing/web-platform/tests/long-animation-frame/tentative/loaf-stream.html
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index 0000000000..e35bc2f9aa
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+++ b/testing/web-platform/tests/long-animation-frame/tentative/loaf-stream.html
@@ -0,0 +1,39 @@
+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>Long Animation Frame Timing: stream promise resolvers</title>
+<meta name="timeout" content="long">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/get-host-info.sub.js"></script>
+<script src="resources/utils.js"></script>
+
+<body>
+<h1>Long Animation Frame: stream promise resolvers</h1>
+<div id="log"></div>
+<script>
+
+test_promise_script(async t => {
+    const response = await fetch("/common/dummy.xml");
+    await response.body.getReader().read();
+    busy_wait(very_long_frame_duration);
+}, "resolve", "ReadableStreamDefaultReader.read.then");
+
+test_promise_script(async t => {
+    const response = await fetch("/common/dummy.xml");
+    await response.body.getReader({ mode: "byob" }).read(new Int32Array(1000));
+    busy_wait(very_long_frame_duration);
+}, "resolve", "ReadableStreamBYOBReader.read.then");
+
+test_promise_script(async t => {
+    const response = await fetch("/common/dummy.xml");
+    const {readable, writable} = new TransformStream({
+      start() {},
+      transform() {
+        busy_wait(very_long_frame_duration);
+      }
+    });
+    response.body.pipeTo(writable);
+    await readable.getReader().read();
+}, "resolve", "StreamPromise.resolve");
+</script>
+</body>