third_party/WebKit/LayoutTests/fast/events/set-event-to-null.html

   1 <html>
   2 <head>
   3 <script language="javascript">
   4 function log(s)
   5 {
   6     document.getElementById("console").appendChild(document.createTextNode(s + "\n"));
   7 }
   8
   9 function mouseOver(event)
  10 {
  11     if (event === null) {
  12         log("FAIL: After MouseEvent, event is null");
  13     } else {
  14         log("PASS: After MouseEvent, event is valid");
  15     }
  16 }
  17
  18 function runTest() {
  19     var target = document.getElementById("target");
  20     var newEvent = document.createEvent("MouseEvent");
  21     newEvent.initMouseEvent("mouseover", false, false, window, 0, 10, 10, 10, 10, false, false, false, false, 0, target);
  22     target.dispatchEvent(newEvent);
  23
  24     if (window.testRunner) {
  25         testRunner.dumpAsText();
  26     }
  27 }
  28
  29 </script>
  30 </head>
  31 <body onLoad="runTest();">
  32 <div id="target" onMouseOver="mouseOver(event);">This test will trigger a mouse over of this element.
  33 We will then check to see if event was properly set (i.e., not null).
  34 This is in response to a v8 bug that can break window.event exposure if the client tries to manually set event.</div>
  35 <div id="console"></div>
  36 <script>
  37 if (!(event === undefined)) {
  38     log("FAIL: event does not begin as undefined");
  39 }
  40 event = null;
  41 if (!(event === null)) {
  42     log("FAIL: event was not successfully set to null");
  43 }
  44 </script>
  45 </body>
  46 </html>