116 lines
4.8 KiB
HTML
116 lines
4.8 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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[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.HTMLParagraphElement, [], new.target);
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assert_equals(Object.getPrototypeOf(o), window.HTMLParagraphElement.prototype,
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"Must use the HTMLParagraphElement from the realm of NewTarget");
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assert_not_equals(Object.getPrototypeOf(o), w.HTMLParagraphElement.prototype,
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"Must not use the HTMLParagraphElement from the realm of the active function object (w.HTMLParagraphElement)");
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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, { extends: "p" });
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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 (customized built-in 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.HTMLParagraphElement, [], new.target);
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assert_equals(Object.getPrototypeOf(o), window.HTMLParagraphElement.prototype,
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"Must use the HTMLParagraphElement from the realm of NewTarget");
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assert_not_equals(Object.getPrototypeOf(o), w.HTMLParagraphElement.prototype,
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"Must not use the HTMLParagraphElement from the realm of the active function object (w.HTMLParagraphElement)");
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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, { extends: "p" });
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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 (customized built-in elements)");
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});
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test_with_window(w => {
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class SomeCustomElement extends HTMLParagraphElement {};
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var getCount = 0;
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var countingProxy = new Proxy(SomeCustomElement, {
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get: function(target, prop, receiver) {
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if (prop == "prototype") {
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++getCount;
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}
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return Reflect.get(target, prop, receiver);
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}
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});
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w.customElements.define("failure-counting-element", countingProxy);
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// define() gets the prototype of the constructor it's passed, so
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// reset the counter.
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getCount = 0;
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assert_throws_js(TypeError,
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function () { new countingProxy() },
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"Should not be able to construct an HTMLParagraphElement not named 'p'");
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assert_equals(getCount, 0, "Should never have gotten .prototype");
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}, 'HTMLParagraphElement constructor must not get .prototype until it finishes its extends sanity checks, calling proxy constructor directly');
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test_with_window(w => {
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class SomeCustomElement extends HTMLParagraphElement {};
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var getCount = 0;
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var countingProxy = new Proxy(SomeCustomElement, {
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get: function(target, prop, receiver) {
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if (prop == "prototype") {
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++getCount;
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}
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return Reflect.get(target, prop, receiver);
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}
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});
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w.customElements.define("failure-counting-element", countingProxy);
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// define() gets the prototype of the constructor it's passed, so
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// reset the counter.
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getCount = 0;
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assert_throws_js(TypeError,
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function () { Reflect.construct(HTMLParagraphElement, [], countingProxy) },
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"Should not be able to construct an HTMLParagraphElement not named 'p'");
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assert_equals(getCount, 0, "Should never have gotten .prototype");
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}, 'HTMLParagraphElement constructor must not get .prototype until it finishes its extends sanity checks, calling via Reflect');
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</script>
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</body>
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