1 files changed, 16 insertions, 0 deletions
diff --git a/testing/web-platform/tests/dom/events/Event-timestamp-high-resolution.html b/testing/web-platform/tests/dom/events/Event-timestamp-high-resolution.html
new file mode 100644
index 0000000000..a049fef64b
--- /dev/null
+++ b/testing/web-platform/tests/dom/events/Event-timestamp-high-resolution.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script type="text/javascript">
+'use strict';
+for (let eventType of ["MouseEvent", "KeyboardEvent", "WheelEvent", "FocusEvent"]) {
+    test(function() {
+        let before = performance.now();
+        let e = new window[eventType]('test');
+        let after = performance.now();
+        assert_greater_than_equal(e.timeStamp, before, "Event timestamp should be greater than performance.now() timestamp taken before its creation");
+        assert_less_than_equal(e.timeStamp, after, "Event timestamp should be less than performance.now() timestamp taken after its creation");
+    }, `Constructed ${eventType} timestamp should be high resolution and have the same time origin as performance.now()`);
+}
+</script>