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diff --git a/testing/web-platform/tests/long-animation-frame/tentative/loaf-source-location.html b/testing/web-platform/tests/long-animation-frame/tentative/loaf-source-location.html
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+++ b/testing/web-platform/tests/long-animation-frame/tentative/loaf-source-location.html
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+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>Long Animation Frame Timing: source location extraction</title>
+<meta name="timeout" content="long">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/utils.js"></script>
+
+<body>
+<h1>Long Animation Frame: source location extraction</h1>
+<div id="log"></div>
+<script>
+
+promise_test(async t => {
+  const [entry, script] = await expect_long_frame_with_script(() => {
+    requestAnimationFrame(function non_bound_function() {
+      busy_wait();
+    });
+  }, script => script.invoker === "FrameRequestCallback", t);
+  assert_equals(script.sourceURL, location.href);
+  assert_equals(script.sourceFunctionName, "non_bound_function");
+  assert_greater_than(script.sourceCharPosition, 0);
+}, "Source location should be extracted from non-bound functions");
+
+promise_test(async t => {
+  const [entry, script] = await expect_long_frame_with_script(() => {
+    const object = {};
+    requestAnimationFrame((function my_bound_function() {
+      busy_wait();
+    }).bind(object));
+  }, script => script.invoker === "FrameRequestCallback", t);
+  assert_equals(script.sourceURL, location.href);
+  assert_equals(script.sourceFunctionName, "my_bound_function");
+  assert_greater_than(script.sourceCharPosition, 0);
+}, "Source location should be extracted from bound functions");
+
+promise_test(async t => {
+  const [entry, script] = await expect_long_frame_with_script(() => {
+    t.step_timeout(function my_timeout() {
+      busy_wait();
+    });
+  }, script => script.invoker === "TimerHandler:setTimeout" && script.sourceURL, t );
+  assert_true(script.sourceURL.includes("testharness.js"));
+}, "Source location should be extracted for setTimeout");
+
+promise_test(async t => {
+  const scriptLocation = new URL("resources/promise-generates-loaf.js", location.href);
+  const [entry, script] = await expect_long_frame_with_script(() => {
+    const scriptElement = document.createElement("script");
+    scriptElement.src = scriptLocation;
+    document.body.appendChild(scriptElement);
+  }, script => script.invoker === "Window.fetch.then", t);
+  assert_true(script.sourceURL.includes("promise-generates-loaf.js"));
+}, "Source location should be extracted for promises");
+
+</script>
+</body>