1 files changed, 117 insertions, 0 deletions
diff --git a/testing/web-platform/tests/dom/events/event-global.html b/testing/web-platform/tests/dom/events/event-global.html
new file mode 100644
index 0000000000..3e8d25ecb5
--- /dev/null
+++ b/testing/web-platform/tests/dom/events/event-global.html
@@ -0,0 +1,117 @@
+<!DOCTYPE html>
+<title>window.event tests</title>
+<link rel="author" title="Mike Taylor" href="mailto:miketaylr@gmail.com">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id=log></div>
+<script>
+setup({allow_uncaught_exception: true});
+
+test(t => {
+  assert_own_property(window, "event");
+  assert_equals(window.event, undefined);
+}, "event exists on window, which is initially set to undefined");
+
+async_test(t => {
+  let target = document.createElement("div");
+  assert_equals(window.event, undefined, "undefined before dispatch");
+
+  let clickEvent = new Event("click");
+  target.addEventListener("click", t.step_func_done(e => {
+    assert_equals(window.event, clickEvent, "window.event set to current event during dispatch");
+  }));
+
+  target.dispatchEvent(clickEvent);
+  assert_equals(window.event, undefined, "undefined after dispatch");
+}, "window.event is only defined during dispatch");
+
+async_test(t => {
+  let parent = document.createElement("div");
+  let root = parent.attachShadow({mode: "closed"});
+  let span = document.createElement("span");
+  root.appendChild(span);
+
+  span.addEventListener("test", t.step_func(e => {
+    assert_equals(window.event, undefined);
+    assert_not_equals(window.event, e);
+  }));
+
+  parent.addEventListener("test", t.step_func_done(e => {
+    assert_equals(window.event, e);
+    assert_not_equals(window.event, undefined);
+  }));
+
+  parent.dispatchEvent(new Event("test", {composed: true}));
+}, "window.event is undefined if the target is in a shadow tree (event dispatched outside shadow tree)");
+
+async_test(t => {
+  let parent = document.createElement("div");
+  let root = parent.attachShadow({mode: "closed"});
+  let span = document.createElement("span");
+  root.appendChild(span);
+  let shadowNode = root.firstElementChild;
+
+  shadowNode.addEventListener("test", t.step_func((e) => {
+    assert_not_equals(window.event, e);
+    assert_equals(window.event, undefined);
+  }));
+
+  parent.addEventListener("test", t.step_func_done(e => {
+    assert_equals(window.event, e);
+    assert_not_equals(window.event, undefined);
+  }));
+
+  shadowNode.dispatchEvent(new Event("test", {composed: true, bubbles: true}));
+}, "window.event is undefined if the target is in a shadow tree (event dispatched inside shadow tree)");
+
+async_test(t => {
+  let parent = document.createElement("div");
+  let root = parent.attachShadow({mode: "open"});
+  document.body.append(parent)
+  let span = document.createElement("span");
+  root.append(span);
+  let shadowNode = root.firstElementChild;
+
+  shadowNode.addEventListener("error", t.step_func(e => {
+    assert_not_equals(window.event, e);
+    assert_equals(window.event, undefined);
+  }));
+
+  let windowOnErrorCalled = false;
+  window.onerror = t.step_func_done(() => {
+    windowOnErrorCalled = true;
+    assert_equals(typeof window.event, "object");
+    assert_equals(window.event.type, "error");
+  });
+
+  shadowNode.dispatchEvent(new ErrorEvent("error", {composed: true, bubbles: true}));
+  assert_true(windowOnErrorCalled);
+}, "window.event is undefined inside window.onerror if the target is in a shadow tree (ErrorEvent dispatched inside shadow tree)");
+
+async_test(t => {
+  let target1 = document.createElement("div");
+  let target2 = document.createElement("div");
+
+  target2.addEventListener("dude", t.step_func(() => {
+    assert_equals(window.event.type, "dude");
+  }));
+
+  target1.addEventListener("cool", t.step_func_done(() => {
+    assert_equals(window.event.type, "cool", "got expected event from global event during dispatch");
+    target2.dispatchEvent(new Event("dude"));
+    assert_equals(window.event.type, "cool", "got expected event from global event after handling a different event handler callback");
+  }));
+
+  target1.dispatchEvent(new Event("cool"));
+}, "window.event is set to the current event during dispatch");
+
+async_test(t => {
+  let target = document.createElement("div");
+
+  target.addEventListener("click", t.step_func_done(e => {
+    assert_equals(e, window.event);
+  }));
+
+  target.dispatchEvent(new Event("click"));
+}, "window.event is set to the current event, which is the event passed to dispatch");
+</script>