DOM: Test document.createEvent('touchevent')

See whatwg/dom#1071

Co-authored-by: Anne van Kesteren <annevk@annevk.nl>

dom/nodes/Document-createEvent-touchevent.window.js

@@ -0,0 +1,12 @@
+for (const variant of ['TouchEvent', 'touchevent', 'TOUCHEVENT']) {
+ test(() => {
+ if (!('ontouchstart' in document)) {
+ assert_throws_dom("NOT_SUPPORTED_ERR", () => {
+ document.createEvent(variant);
+ });
+ } else {
+ document.createEvent(variant);
+ // The interface and other details of the event is tested in Document-createEvent.https.html
+ }
+ }, `document.createEvent('${variant}') should throw if 'expose legacy touch event APIs' is false`);
+}

dom/nodes/Document-createEvent.https.html

@@ -7,13 +7,20 @@
 <script src="Document-createEvent.js"></script>
 <div id="log"></div>
 <script>
-function testAlias(arg, iface) {
+function supportsTouchEvents(isTouchEvent) {
+ if (isTouchEvent) {
+ assert_implements_optional('ontouchstart' in document, "'expose legacy touch event APIs'");
+ }
+}
+function testAlias(arg, iface, isTouchEvent) {
  var ev;
  test(function() {
+ supportsTouchEvents(isTouchEvent);
  ev = document.createEvent(arg);
  assert_equals(Object.getPrototypeOf(ev), window[iface].prototype);
  }, arg + " should be an alias for " + iface + ".");
  test(function() {
+ supportsTouchEvents(isTouchEvent);
  assert_equals(ev.type, "",
  "type should be initialized to the empty string");
  assert_equals(ev.target, null,
@@ -32,11 +39,13 @@
  "isTrusted should be initialized to false");
  }, "createEvent('" + arg + "') should be initialized correctly.");
 }
+aliases.TouchEvent = 'TouchEvent';
 for (var alias in aliases) {
+ var isTouchEvent = alias === 'TouchEvent';
  var iface = aliases[alias];
- testAlias(alias, iface);
- testAlias(alias.toLowerCase(), iface);
- testAlias(alias.toUpperCase(), iface);
+ testAlias(alias, iface, isTouchEvent);
+ testAlias(alias.toLowerCase(), iface, isTouchEvent);
+ testAlias(alias.toUpperCase(), iface, isTouchEvent);
 
  if (alias[alias.length - 1] != "s") {
  var plural = alias + "s";