1 files changed, 55 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/webappapis/scripting/events/event-handler-spec-example.window.js b/testing/web-platform/tests/html/webappapis/scripting/events/event-handler-spec-example.window.js
new file mode 100644
index 0000000000..abf46882aa
--- /dev/null
+++ b/testing/web-platform/tests/html/webappapis/scripting/events/event-handler-spec-example.window.js
@@ -0,0 +1,55 @@
+var objects = [{}, function() {}, new Number(42), new String()];
+var primitives = [42, null, undefined, ""];
+var firstEventHandler;
+objects.forEach(function(object) {
+  test(t => {
+    var i = 0;
+    firstEventHandler = t.unreached_func('First event handler.');
+    var uncalled = "firstEventHandler();";
+    var button = document.createElement('button');
+    button.onclick = object; // event handler listener is registered here
+    assert_equals(button.onclick, object);
+    button.addEventListener('click', t.step_func(() => { assert_equals(++i, 2) }), false);
+    button.setAttribute('onclick', uncalled);
+    button.addEventListener('click', t.step_func(() => { assert_equals(++i, 3) }), false);
+    button.onclick = t.step_func(() => { assert_equals(++i, 1); });
+    button.addEventListener('click', t.step_func(() => { assert_equals(++i, 4) }), false);
+    button.click()
+    assert_equals(button.getAttribute("onclick"), uncalled)
+    assert_equals(i, 4);
+  }, "Event handler listeners should be registered when they are first set to an object value " +
+     "(" + format_value(object) + ").");
+});
+primitives.forEach(function(primitive) {
+  test(t => {
+    var i = 0;
+    firstEventHandler = t.unreached_func('First event handler.');
+    var uncalled = "firstEventHandler();";
+    var button = document.createElement('button');
+    button.onclick = primitive;
+    assert_equals(button.onclick, null);
+    button.addEventListener('click', t.step_func(() => { assert_equals(++i, 1) }), false);
+    button.setAttribute('onclick', uncalled); // event handler listener is registered here
+    button.addEventListener('click', t.step_func(() => { assert_equals(++i, 3) }), false);
+    button.onclick = t.step_func(() => { assert_equals(++i, 2); });
+    button.addEventListener('click', t.step_func(() => { assert_equals(++i, 4) }), false);
+    button.click()
+    assert_equals(button.getAttribute("onclick"), uncalled)
+    assert_equals(i, 4);
+  }, "Event handler listeners should be registered when they are first set to an object value " +
+     "(" + format_value(primitive) + ").");
+});
+test(t => {
+  var i = 0;
+  firstEventHandler = t.unreached_func('First event handler.');
+  var uncalled = "firstEventHandler();";
+  var button = document.createElement('button');
+  button.addEventListener('click', t.step_func(() => { assert_equals(++i, 1) }), false);
+  button.setAttribute('onclick', uncalled); // event handler listener is registered here
+  button.addEventListener('click', t.step_func(() => { assert_equals(++i, 3) }), false);
+  button.onclick = t.step_func(() => { assert_equals(++i, 2); });
+  button.addEventListener('click', t.step_func(() => { assert_equals(++i, 4) }), false);
+  button.click()
+  assert_equals(button.getAttribute("onclick"), uncalled)
+  assert_equals(i, 4);
+}, "Event handler listeners should be registered when they are first set to an object value.");