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diff --git a/testing/web-platform/tests/user-timing/clearMarks.html b/testing/web-platform/tests/user-timing/clearMarks.html
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+++ b/testing/web-platform/tests/user-timing/clearMarks.html
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+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8" />
+<title>functionality test of window.performance.clearMarks</title>
+<link rel="author" title="Intel" href="http://www.intel.com/" />
+<link rel="help" href="http://www.w3.org/TR/user-timing/#extensions-performance-interface"/>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/performance-timeline-utils.js"></script>
+<script src="resources/webperftestharness.js"></script>
+<script src="resources/webperftestharnessextension.js"></script>
+<script>
+setup({ explicit_done: true });
+
+function onload_test()
+{
+    const entrylist_checker = new performance_entrylist_checker('mark');
+    const string_mark_names = mark_names.map(function (x) { return String(x)});
+    mark_names.forEach(function(name) {
+        performance.mark(name);
+    });
+
+    for (let i = 0; i < mark_names.length; ++i)
+    {
+        performance.clearMarks(mark_names[i]);
+        const retained_entries = performance.getEntriesByType('mark');
+        const non_retained_entries = performance.getEntriesByName(mark_names[i], 'mark');
+        entrylist_checker.entrylist_check(retained_entries, mark_names.length - i - 1, string_mark_names,
+            'First loop: checking entries after removing "' + mark_names[i] + '". ');
+        test_equals(non_retained_entries.length, 0,
+            'First loop: marks that we cleared for "' + mark_names[i] + '" should not exist anymore.');
+    }
+
+    mark_names.forEach(function(name) {
+        performance.mark(name);
+    });
+    performance.clearMarks();
+    test_equals(performance.getEntriesByType('mark').length, 0, 'No marks should exist after we clear all.');
+
+    // Following cases test clear existed mark name that is tied for two times.
+    mark_names.forEach(function(name) {
+        performance.mark(name);
+    });
+    mark_names.forEach(function(name) {
+        performance.mark(name);
+    });
+
+    for (let i = 0; i < mark_names.length; ++i)
+    {
+        performance.clearMarks(mark_names[i]);
+        const retained_entries = performance.getEntriesByType('mark');
+        const non_retained_entries = performance.getEntriesByName(mark_names[i], 'mark');
+        entrylist_checker.entrylist_check(retained_entries, (mark_names.length - i - 1) * 2, string_mark_names,
+            'Second loop: checking entries after removing "' + mark_names[i] + '". ');
+        test_equals(non_retained_entries.length, 0,
+            'Second loop: marks that we cleared for "' + mark_names[i] + '" should not exist anymore.');
+    }
+
+    // Following cases test clear functionality when mark names are tied for two times.
+    mark_names.forEach(function(name) {
+        performance.mark(name);
+    });
+    mark_names.forEach(function(name) {
+        performance.mark(name);
+    });
+    var entry_number_before_useless_clear = performance.getEntriesByType('Mark').length;
+    performance.clearMarks('NonExist');
+    var entry_number_after_useless_clear = performance.getEntriesByType('Mark').length;
+    test_equals(entry_number_before_useless_clear, entry_number_after_useless_clear, 'Nothing should happen if we clear a non-exist mark.');
+
+    performance.clearMarks();
+    test_equals(performance.getEntriesByType('mark').length, 0, 'No marks should exist when we clear all.');
+
+    done();
+}
+</script>
+</head>
+<body onload=onload_test()>
+    <h1>Description</h1>
+    <p>This test validates functionality of the interface window.performance.clearMarks.</p>
+    <div id="log"></div>
+</body>
+</html>