window-indexed-properties.html (3118B)
1 <!doctype html> 2 <meta charset=utf-8> 3 <title>Indexed properties of the window object (non-strict mode)</title> 4 <link rel="author" title="Ms2ger" href="ms2ger@gmail.com"> 5 <link rel="help" href="https://html.spec.whatwg.org/multipage/#window"> 6 <link rel="help" href="https://html.spec.whatwg.org/multipage/#dom-window-item"> 7 <link rel="help" href="https://webidl.spec.whatwg.org/#getownproperty"> 8 <link rel="help" href="https://webidl.spec.whatwg.org/#defineownproperty"> 9 <script src="/resources/testharness.js"></script> 10 <script src="/resources/testharnessreport.js"></script> 11 <div id=log></div> 12 <iframe></iframe> 13 <script> 14 test(function() { 15 assert_false("-1" in window, "-1 not in window"); 16 assert_equals(window[-1], undefined); 17 window[-1] = "foo"; 18 assert_equals(window[-1], "foo"); 19 }); 20 test(() => { 21 const desc = Object.getOwnPropertyDescriptor(window, "0"); 22 assert_true(desc.configurable); 23 assert_true(desc.enumerable); 24 assert_false(desc.writable); 25 }, "Ensure indexed properties have the correct configuration"); 26 test(function() { 27 window[0] = "foo"; 28 assert_throws_js(TypeError, () => Object.defineProperty(window, 0, { value: "bar" })) 29 assert_throws_js(TypeError, () => Object.defineProperty(window, 0, { get() { return "baz" } })) 30 assert_throws_js(TypeError, () => Object.defineProperty(window, 0, { set() { return "quz" } })) 31 assert_equals(window[0], 32 document.getElementsByTagName("iframe")[0].contentWindow); 33 assert_equals(delete window[0], false); 34 }); 35 test(function() { 36 window[1] = "foo"; 37 assert_throws_js(TypeError, () => Object.defineProperty(window, 1, { value: "bar" })) 38 assert_throws_js(TypeError, () => Object.defineProperty(window, 1, { get() { return "baz" } })) 39 assert_throws_js(TypeError, () => Object.defineProperty(window, 1, { set(v) { return "quz" } })) 40 assert_equals(window[1], undefined); 41 assert_equals(Object.getOwnPropertyDescriptor(window, 1), undefined); 42 assert_equals(delete window[1], true); 43 }); 44 test(function() { 45 window[4294967294] = 1; 46 assert_false(Reflect.set(window, 4294967294, 2)); 47 assert_false(Reflect.defineProperty(window, 4294967294, { value: 3 })); 48 assert_throws_js(TypeError, () => Object.defineProperty(window, 4294967294, { get: () => 4 })); 49 assert_equals(window[4294967294], undefined); 50 assert_false(4294967294 in window); 51 assert_true(delete window[4294967294]); 52 }, "Borderline numeric key: 2 ** 32 - 2 is an index"); 53 test(function() { 54 window[4294967295] = 1; 55 assert_equals(window[4294967295], 1); 56 assert_true(Reflect.set(window, 4294967295, 2)); 57 assert_equals(window[4294967295], 2); 58 assert_true(Reflect.defineProperty(window, 4294967295, { value: 3 })); 59 assert_equals(window[4294967295], 3); 60 Object.defineProperty(window, 4294967295, { get: () => 4 }); 61 assert_equals(window[4294967295], 4); 62 assert_true(delete window[4294967295]); 63 assert_false(4294967295 in window); 64 }, "Borderline numeric key: 2 ** 32 - 1 is not an index"); 65 test(function() { 66 var proto = Window.prototype; 67 [-1, 0, 1].forEach(function(idx) { 68 assert_false(idx in proto, idx + " in proto"); 69 }); 70 }); 71 </script>