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<!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>