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diff --git a/testing/web-platform/tests/requestidlecallback/deadline-after-expired-timer.html b/testing/web-platform/tests/requestidlecallback/deadline-after-expired-timer.html
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index 0000000000..47396ea5ed
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+++ b/testing/web-platform/tests/requestidlecallback/deadline-after-expired-timer.html
@@ -0,0 +1,22 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>The deadline after an expired timer must not be negative</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<div id="log"></div>
+<script>
+ async_test(function(t) {
+ setTimeout(() => {
+
+ requestIdleCallback(
+ t.step_func((deadline) => {
+ assert_false(deadline.didTimeout);
+ assert_greater_than(deadline.timeRemaining(), 0);
+ t.done();
+ }),
+ { timeout: 1000 }
+ );
+
+ }, 0);
+ });
+</script>