--- a/dom/events/test/test_eventTimeStamp.html
+++ b/dom/events/test/test_eventTimeStamp.html
@@ -55,35 +55,35 @@ function testRegularEvents() {
   if (document.readyState === "complete") {
     ok(false, "Onload event has already fired");
     finishTests();
     return;
   }
   var timeBeforeEvent = performance.now();
   addEventListener("load", function(evt) {
     var timeAfterEvent = performance.now();
-    ok(evt.timeStamp > timeBeforeEvent &&
-       evt.timeStamp < timeAfterEvent,
-       "Event timestamp (" + evt.timeStamp + ") is in expected range: (" +
-         timeBeforeEvent + ", " + timeAfterEvent + ")");
+    ok(evt.timeStamp >= timeBeforeEvent &&
+       evt.timeStamp <= timeAfterEvent,
+       "Event timestamp (" + evt.timeStamp + ") is in expected range: [" +
+         timeBeforeEvent + ", " + timeAfterEvent + "]");
     testWorkerEvents();
   });
 }
 
 function testWorkerEvents() {
   var blob = new Blob([ document.getElementById("worker-src").textContent ],
                       { type: "text/javascript" });
   var worker = new Worker(URL.createObjectURL(blob));
   worker.onmessage = function(evt) {
     var timeAfterEvent = performance.now() + performance.timeOrigin;
     ok(evt.data >= timeBeforeEvent &&
        evt.data <= timeAfterEvent,
        "Event timestamp in dedicated worker (" + evt.data +
-         ") is in expected range: (" +
-         timeBeforeEvent + ", " + timeAfterEvent + ")");
+         ") is in expected range: [" +
+         timeBeforeEvent + ", " + timeAfterEvent + "]");
     worker.terminate();
     testSharedWorkerEvents();
   };
   var timeBeforeEvent = performance.now() + performance.timeOrigin;
   worker.postMessage("");
 }
 
 function testSharedWorkerEvents() {