130 lines
4.5 KiB
HTML
130 lines
4.5 KiB
HTML
<!DOCTYPE html>
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<title>Custom Elements: [HTMLConstructor] derives prototype from NewTarget</title>
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<meta name="author" title="Domenic Denicola" href="mailto:d@domenic.me">
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<meta name="help" content="https://html.spec.whatwg.org/multipage/dom.html#htmlconstructor">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script src="../resources/custom-elements-helpers.js"></script>
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<body>
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<script>
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"use strict";
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test_with_window(w => {
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let beforeDefinition = true;
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const proto1 = { "proto": "number one" };
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const proto2 = { "proto": "number two" };
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function TestElement() {
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const o = Reflect.construct(w.HTMLElement, [], new.target);
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assert_equals(Object.getPrototypeOf(o), proto2,
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"Must use the value returned from new.target.prototype");
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assert_not_equals(Object.getPrototypeOf(o), proto1,
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"Must not use the prototype stored at definition time");
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}
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const ElementWithDynamicPrototype = new Proxy(TestElement, {
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get: function (target, name) {
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if (name == "prototype")
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return beforeDefinition ? proto1 : proto2;
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return target[name];
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}
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});
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w.customElements.define("test-element", ElementWithDynamicPrototype);
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beforeDefinition = false;
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new ElementWithDynamicPrototype();
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}, "Use NewTarget's prototype, not the one stored at definition time");
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test_with_window(w => {
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// We have to not throw during define(), but throw during super()
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let throws = false;
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let err = { name: "prototype throws" };
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function TestElement() {
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throws = true;
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assert_throws_exactly(err, () => {
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Reflect.construct(w.HTMLElement, [], new.target);
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});
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}
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const ElementWithDynamicPrototype = new Proxy(TestElement, {
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get: function (target, name) {
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if (throws && name == "prototype")
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throw err;
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return target[name];
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}
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});
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w.customElements.define("test-element", ElementWithDynamicPrototype);
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new ElementWithDynamicPrototype();
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}, "Rethrow any exceptions thrown while getting the prototype");
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[null, undefined, 5, "string"].forEach(function (notAnObject) {
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test_with_window(w => {
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// We have to return an object during define(), but not during super()
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let returnNotAnObject = false;
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function TestElement() {
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const o = Reflect.construct(w.HTMLElement, [], new.target);
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assert_equals(Object.getPrototypeOf(new.target), window.Function.prototype);
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assert_equals(Object.getPrototypeOf(o), window.HTMLElement.prototype,
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"Must use the HTMLElement from the realm of NewTarget");
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assert_not_equals(Object.getPrototypeOf(o), w.HTMLElement.prototype,
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"Must not use the HTMLElement from the realm of the active function object (w.HTMLElement)");
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return o;
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}
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const ElementWithDynamicPrototype = new Proxy(TestElement, {
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get: function (target, name) {
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if (name == "prototype")
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return returnNotAnObject ? notAnObject : {};
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return target[name];
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}
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});
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w.customElements.define("test-element", ElementWithDynamicPrototype);
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returnNotAnObject = true;
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new ElementWithDynamicPrototype();
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}, "If prototype is not object (" + notAnObject + "), derives the fallback from NewTarget's realm (autonomous custom elements)");
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test_with_window(w => {
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// We have to return an object during define(), but not during super()
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let returnNotAnObject = false;
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function TestElement() {
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const o = Reflect.construct(w.HTMLElement, [], new.target);
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assert_equals(Object.getPrototypeOf(new.target), window.Function.prototype);
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assert_equals(Object.getPrototypeOf(o), window.HTMLElement.prototype,
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"Must use the HTMLElement from the realm of NewTarget");
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assert_not_equals(Object.getPrototypeOf(o), w.HTMLElement.prototype,
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"Must not use the HTMLElement from the realm of the active function object (w.HTMLElement)");
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return o;
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}
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// Create the proxy in the subframe, which should not affect what our
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// prototype ends up as.
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const ElementWithDynamicPrototype = new w.Proxy(TestElement, {
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get: function (target, name) {
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if (name == "prototype")
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return returnNotAnObject ? notAnObject : {};
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return target[name];
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}
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});
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w.customElements.define("test-element", ElementWithDynamicPrototype);
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returnNotAnObject = true;
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new ElementWithDynamicPrototype();
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}, "If prototype is not object (" + notAnObject + "), derives the fallback from NewTarget's GetFunctionRealm (autonomous custom elements)");
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});
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</script>
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</body>
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