third_party/WebKit/LayoutTests/fast/events/message-port-gc-closed.html

   1 <!DOCTYPE html>
   2 <body>
   3 <script src="../../resources/js-test.js"></script>
   4 <script>
   5 description("MessagePorts (and their execution contexts) should be collected by GC once close() has been called on them");
   6
   7 window.jsTestIsAsync = true;
   8
   9 function runGCAndTest() {
  10     gc();
  11     shouldBeTrue("iframeDocGC.wasCollected");
  12     finishJSTest();
  13 }
  14
  15 window.onmessage = function(evt) {
  16     iframeDocGC = internals.observeGC(document.querySelector('iframe').contentDocument);
  17     document.querySelector('iframe').remove();
  18     // The iframe is reachable via evt.source, and evt is on the
  19     // stack. Force a GC upon return from the event handler, so
  20     // that it no longer will be in scope and the iframe can
  21     // be GCed.
  22     setTimeout(runGCAndTest, 0);
  23 }
  24 </script>
  25 <iframe src="resources/message-port-gc-closed-iframe.html"></iframe>
  26 </body>