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<!DOCTYPE html>
<meta charset="utf-8">
<title>Legacy platform objects [[DefineOwnProperty]] method</title>
<link rel="help" href="https://webidl.spec.whatwg.org/#legacy-platform-object-defineownproperty">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="./helper.js"></script>
<script>
test(function() {
let span = document.createElement("span");
span.className = "foo";
// DOMTokenList supports an indexed property getter but not a setter.
let domTokenList = span.classList;
// Confirm the test settings.
assert_equals(domTokenList.length, 1);
assert_prop_desc_equals(domTokenList, "0",
{value: "foo", writable: false, enumerable: true,
configurable: true});
assert_prop_desc_equals(domTokenList, "1", undefined);
// Actual test
assert_throws_js(TypeError, () =>
Object.defineProperty(domTokenList, "0", {value: true, writable: true}));
assert_throws_js(TypeError, () =>
Object.defineProperty(domTokenList, "1", {value: true, writable: true}));
assert_throws_js(TypeError, () =>
Object.defineProperty(domTokenList, "0", {get: () => {}}));
assert_throws_js(TypeError, () =>
Object.defineProperty(domTokenList, "0", {set: () => {}}));
assert_throws_js(TypeError, () =>
Object.defineProperty(domTokenList, "1", {get: () => {}}));
assert_throws_js(TypeError, () =>
Object.defineProperty(domTokenList, "1", {set: () => {}}));
assert_equals(domTokenList[0], "foo");
assert_equals(domTokenList[1], undefined);
domTokenList[0] = "bar";
domTokenList[1] = "bar";
assert_equals(domTokenList[0], "foo");
assert_equals(domTokenList[1], undefined);
assert_throws_js(TypeError, () => {
"use strict";
domTokenList[0] = "bar";
});
assert_throws_js(TypeError, () => {
"use strict";
domTokenList[1] = "bar";
});
// Nothing must change after all.
assert_equals(domTokenList.length, 1);
assert_prop_desc_equals(domTokenList, "0",
{value: "foo", writable: false, enumerable: true,
configurable: true});
assert_prop_desc_equals(domTokenList, "1", undefined);
}, "Test [[DefineOwnProperty]] with no indexed property setter support.");
test(function() {
// HTMLSelectElement supports an indexed property setter.
let select = document.createElement("select");
let option0 = document.createElement("option");
let option1 = document.createElement("option");
// Confirm the test settings.
assert_equals(select.length, 0);
assert_prop_desc_equals(select, "0", undefined);
// Try to define an accessor property with non supported property index.
assert_throws_js(TypeError, () =>
Object.defineProperty(select, "0", {get: () => {}}));
assert_throws_js(TypeError, () =>
Object.defineProperty(select, "0", {set: () => {}}));
assert_prop_desc_equals(select, "0", undefined);
// writable, enumerable, configurable will be ignored.
Object.defineProperty(select, "0", {value: option0, writable: false,
enumerable: false, configurable: false});
assert_prop_desc_equals(select, "0",
{value: option0, writable: true, enumerable: true,
configurable: true});
select[1] = option1;
assert_prop_desc_equals(select, "1",
{value: option1, writable: true, enumerable: true,
configurable: true});
// Try to define an accessor property with a supported property index.
assert_throws_js(TypeError, () =>
Object.defineProperty(select, "0", {get: () => {}}));
assert_throws_js(TypeError, () =>
Object.defineProperty(select, "0", {set: () => {}}));
assert_prop_desc_equals(select, "0",
{value: option0, writable: true, enumerable: true,
configurable: true});
}, "Test [[DefineOwnProperty]] with indexed property setter support.");
test(function() {
let dataList = document.createElement("datalist");
let option0 = document.createElement("option");
option0.id = "foo";
dataList.append(option0);
// HTMLCollection supports a named property getter but not a setter.
let htmlCollection = dataList.options;
// Confirm the test settings.
assert_equals(htmlCollection.length, 1);
// HTMLCollection is marked LegacyUnenumerableNamedProperties so enumerable
// is false.
assert_prop_desc_equals(htmlCollection, "foo",
{value: option0, writable: false, enumerable: false,
configurable: true});
assert_prop_desc_equals(htmlCollection, "bar", undefined);
// Actual test
assert_throws_js(TypeError, () =>
Object.defineProperty(htmlCollection, "foo",
{value: true, writable: true}));
assert_throws_js(TypeError, () =>
Object.defineProperty(htmlCollection, "foo", {get: () => {}}));
assert_throws_js(TypeError, () =>
Object.defineProperty(htmlCollection, "foo", {set: () => {}}));
let option1 = document.createElement("option");
option1.id = "bar";
Object.defineProperty(htmlCollection, "bar",
{value: option1, writable: true});
assert_equals(htmlCollection["foo"], option0);
assert_equals(htmlCollection["bar"], option1);
htmlCollection["foo"] = document.documentElement;
htmlCollection["baz"] = document.documentElement;
assert_equals(htmlCollection["foo"], option0);
assert_equals(htmlCollection["baz"], document.documentElement);
assert_throws_js(TypeError, () => {
"use strict";
htmlCollection["foo"] = document.documentElement;
});
// Nothing must change after all for supported property names.
assert_prop_desc_equals(htmlCollection, "foo",
{value: option0, writable: false, enumerable: false,
configurable: true});
}, "Test [[DefineOwnProperty]] with no named property setter support.");
test(function() {
let element = document.createElement("div");
// DOMStringMap supports a named property setter.
let domStringMap = element.dataset;
// Confirm the test settings.
assert_prop_desc_equals(domStringMap, "foo", undefined);
// Try to define an accessor property with non supported property name.
assert_throws_js(TypeError, () =>
Object.defineProperty(domStringMap, "foo", {get: () => {}}));
assert_throws_js(TypeError, () =>
Object.defineProperty(domStringMap, "foo", {set: () => {}}));
assert_prop_desc_equals(domStringMap, "foo", undefined);
// writable, enumerable, configurable will be ignored.
Object.defineProperty(domStringMap, "foo",
{value: "foo content", writable: false,
enumerable: false, configurable: false});
assert_prop_desc_equals(domStringMap, "foo",
{value: "foo content", writable: true,
enumerable: true, configurable: true});
domStringMap["bar"] = "bar content";
assert_prop_desc_equals(domStringMap, "bar",
{value: "bar content", writable: true,
enumerable: true, configurable: true});
// Try to define an accessor property with a supported property name.
assert_throws_js(TypeError, () =>
Object.defineProperty(domStringMap, "foo", {get: () => {}}));
assert_throws_js(TypeError, () =>
Object.defineProperty(domStringMap, "foo", {set: () => {}}));
assert_prop_desc_equals(domStringMap, "foo",
{value: "foo content", writable: true,
enumerable: true, configurable: true});
}, "Test [[DefineOwnProperty]] with named property setter support.");
</script>
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