1 files changed, 35 insertions, 0 deletions
diff --git a/testing/web-platform/tests/hr-time/monotonic-clock.html b/testing/web-platform/tests/hr-time/monotonic-clock.html
new file mode 100644
index 000000000..af3b230f8
--- /dev/null
+++ b/testing/web-platform/tests/hr-time/monotonic-clock.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8" />
+<title>window.performance.now() chronology</title>
+<link rel="author" title="W3C" href="http://www.w3.org/" />
+<link rel="help" href="http://www.w3.org/TR/hr-time/#sec-monotonic-clock"/>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+test(function() {
+  assert_true(window.performance.now() > 0, "window.performance.now() returns positive numbers");
+}, "window.performance.now() returns a positive number", {assert: "The time values returned when calling the now method MUST be monotonically increasing and not subject to system clock adjustments or system clock skew."});
+
+test(function() {
+    var now1 = window.performance.now();
+    var now2 = window.performance.now();
+    assert_true((now2-now1) >= 0, "window.performance.now() difference is not negative");
+  },
+  "window.performance.now() difference is not negative",
+  {
+    assert: "The difference between any two chronologically recorded time values returned from the now method MUST never be negative."
+  }
+);
+
+</script>
+</head>
+<body>
+<h1>Description</h1>
+<p>This test validates that window.performance.now() follows the monotonic clock requirements.</p>
+
+<div id="log"></div>
+
+</body>
+</html>