| <!doctype html> |
| <meta charset=utf-8> |
| <title></title> |
| <script src=/resources/testharness.js></script> |
| <script src=/resources/testharnessreport.js></script> |
| <!-- A window to work with that won't trigger the harness exception detection |
| when we fire "error" events at it --> |
| <iframe style="display: none"></iframe> |
| <script> |
| test(function() { |
| var blob = new Blob([""]); |
| // Most targets disabled for now until |
| // https://github.com/whatwg/html/issues/2296 is sorted out. |
| var targets = [ frames[0] /*, document, document.documentElement, |
| new Worker(URL.createObjectURL(blob) */ ]; |
| // Event constructors also mostly disabled until |
| // https://github.com/whatwg/html/issues/2296 is sorted out. |
| var eventCtors = [ /* Event, */ ErrorEvent /*, MouseEvent */ ]; |
| var values = [true, false, "", "abc", {}, 0, 1, -1, null, undefined, |
| 2.5, NaN, Infinity, Symbol.toStringTag ]; |
| // Event types also mostly disabled pending |
| // https://github.com/whatwg/html/issues/2296 |
| var eventTypes = [ "error"/*, "click", "load"*/ ]; |
| |
| // Variables that keep track of which subtest we're running. |
| var curTarget; |
| var curValue; |
| var curCtor; |
| var curType; |
| |
| function defaultPreventedTester(event) { |
| var expectedValue; |
| if (curTarget === frames[0] && |
| curCtor === ErrorEvent && |
| curValue === true && |
| curType == "error") { |
| expectedValue = true; |
| } else { |
| // This will need adjusting once we allow more targets and event |
| // constructors above! |
| expectedValue = false; |
| } |
| var valueRepr; |
| if (typeof curValue == "string") { |
| valueRepr = '"' + curValue + '"'; |
| } else { |
| valueRepr = String(curValue); |
| } |
| test(function() { |
| assert_equals(event.defaultPrevented, expectedValue); |
| }, "Returning " + valueRepr + |
| " from " + String(curTarget) + "'s on" + curType + |
| " event handler while " + curCtor.name + |
| " is firing should" + |
| (expectedValue ? "" : " not") + |
| " cancel the event"); |
| } |
| |
| for (curCtor of eventCtors) { |
| for (curTarget of targets) { |
| for (curType of eventTypes) { |
| for (curValue of values) { |
| // We have to make sure that defaultPreventedTester is added after |
| // our event handler. |
| curTarget["on" + curType] = function() { return curValue; } |
| curTarget.addEventListener(curType, defaultPreventedTester); |
| var e = new curCtor(curType, { cancelable: true }); |
| curTarget.dispatchEvent(e); |
| curTarget["on" + curType] = null; |
| curTarget.removeEventListener(curType, defaultPreventedTester); |
| } |
| } |
| } |
| } |
| }, "event handler cancellation behavior"); |
| </script> |
