chromium/third_party/blink/web_tests/ppapi/plugins/simple-expando.html

<!DOCTYPE html>
<html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<body>
<script>
test(function() {
  var obj = document.createElement("object");
  obj.type = "application/x-blink-deprecated-test-plugin";
  document.body.appendChild(obj);
  obj.foo = 1;
  assert_equals(obj.foo, 1, "Setting an expando on an <object> works");
  obj.foo = 2;
  assert_equals(obj.foo, 2, "Repeatedly setting an expando on an <object> works");
}, "setting an expando");
</script>
</body>