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// https://dom.spec.whatwg.org/#concept-event-dispatch
const host = document.createElement("div"),
child = host.appendChild(document.createElement("p")),
shadow = host.attachShadow({ mode: "closed" }),
slot = shadow.appendChild(document.createElement("slot"));
test(() => {
for (target of [shadow, slot]) {
for (relatedTarget of [new XMLHttpRequest(), self, host]) {
const event = new FocusEvent("demo", { relatedTarget: relatedTarget });
target.dispatchEvent(event);
assert_equals(event.target, null);
assert_equals(event.relatedTarget, null);
}
}
}, "Reset if target pointed to a shadow tree");
test(() => {
for (relatedTarget of [shadow, slot]) {
for (target of [new XMLHttpRequest(), self, host]) {
const event = new FocusEvent("demo", { relatedTarget: relatedTarget });
target.dispatchEvent(event);
assert_equals(event.target, target);
assert_equals(event.relatedTarget, host);
}
}
}, "Retarget a shadow-tree relatedTarget");
test(t => {
const shadowChild = shadow.appendChild(document.createElement("div"));
shadowChild.addEventListener("demo", t.step_func(() => document.body.appendChild(shadowChild)));
const event = new FocusEvent("demo", { relatedTarget: new XMLHttpRequest() });
shadowChild.dispatchEvent(event);
assert_equals(shadowChild.parentNode, document.body);
assert_equals(event.target, null);
assert_equals(event.relatedTarget, null);
shadowChild.remove();
}, "Reset if target pointed to a shadow tree pre-dispatch");
test(t => {
const shadowChild = shadow.appendChild(document.createElement("div"));
document.body.addEventListener("demo", t.step_func(() => document.body.appendChild(shadowChild)));
const event = new FocusEvent("demo", { relatedTarget: shadowChild });
document.body.dispatchEvent(event);
assert_equals(shadowChild.parentNode, document.body);
assert_equals(event.target, document.body);
assert_equals(event.relatedTarget, host);
shadowChild.remove();
}, "Retarget a shadow-tree relatedTarget, part 2");
test(t => {
const event = new FocusEvent("heya", { relatedTarget: shadow, cancelable: true }),
callback = t.unreached_func();
host.addEventListener("heya", callback);
t.add_cleanup(() => host.removeEventListener("heya", callback));
event.preventDefault();
assert_true(event.defaultPrevented);
assert_false(host.dispatchEvent(event));
assert_equals(event.target, null);
assert_equals(event.relatedTarget, null);
// Check that the dispatch flag is cleared
event.initEvent("x");
assert_equals(event.type, "x");
}, "Reset targets on early return");
test(t => {
const input = document.body.appendChild(document.createElement("input")),
event = new MouseEvent("click", { relatedTarget: shadow });
let seen = false;
t.add_cleanup(() => input.remove());
input.type = "checkbox";
input.oninput = t.step_func(() => {
assert_equals(event.target, null);
assert_equals(event.relatedTarget, null);
assert_equals(event.composedPath().length, 0);
seen = true;
});
assert_true(input.dispatchEvent(event));
assert_true(seen);
}, "Reset targets before activation behavior");
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