1 files changed, 25 insertions, 0 deletions
diff --git a/testing/web-platform/tests/long-animation-frame/tentative/loaf-popup.html b/testing/web-platform/tests/long-animation-frame/tentative/loaf-popup.html
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index 0000000000..3f9758953e
--- /dev/null
+++ b/testing/web-platform/tests/long-animation-frame/tentative/loaf-popup.html
@@ -0,0 +1,25 @@
+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>Long Animation Frame Timing: popups</title>
+<meta name="timeout" content="long">
+<body>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/get-host-info.sub.js"></script>
+<script src="/common/utils.js"></script>
+<script src="/common/dispatcher/dispatcher.js"></script>
+<script src="resources/utils.js"></script>
+<div id="log"></div>
+<script>
+const host_info = get_host_info();
+const { ORIGIN } = host_info;
+
+promise_test(async t => {
+    const [executor] = await prepare_exec_popup(t, ORIGIN);
+    await expect_no_long_frame(() => executor.execute_script((duration) => {
+        const deadline = performance.now() + duration;
+        while (performance.now() < deadline) {}
+    }, [very_long_frame_duration]), t);
+}, 'A long busy wait in a same-origin popup is a not long animation frame');
+</script>
+</body>