Image-constructor.html (1932B)
1 <!DOCTYPE HTML> 2 <title>DOM Image constructor Test</title> 3 <meta content="text/html; charset=UTF-8" http-equiv="Content-Type"> 4 <link rel="help" href="https://html.spec.whatwg.org/multipage/#the-img-element" /> 5 <meta name="assert" content="Tests the Image constructor for the img-element"> 6 <script src="/resources/testharness.js"></script> 7 <script src="/resources/testharnessreport.js"></script> 8 9 10 <div id="log"></div> 11 <script> 12 test(function() { 13 var img = new Image(); 14 assert_true(img != undefined); 15 }, "Image constructor works"); 16 17 test(function() { 18 assert_equals(Image.prototype, HTMLImageElement.prototype); 19 }, "Image and HTMLImageElement share a prototype"); 20 21 test(function() { 22 assert_true((new Image()).localName === "img"); 23 }, "Image localName is img"); 24 25 test(function() { 26 assert_true((new Image()).namespaceURI === "http://www.w3.org/1999/xhtml"); 27 }, "Image namespace URI is correct"); 28 29 test(function() { 30 assert_equals(Image.name, "Image", "Image name should be Image (not HTMLImageElement)"); 31 assert_equals(Object.getPrototypeOf(Image), Function.prototype, "Image's prototype is Function.prototype"); 32 assert_equals(Image.prototype, HTMLImageElement.prototype, "Image.prototype is same as HTMLImageElement.prototype"); 33 assert_equals(Object.getPrototypeOf(new Image()), HTMLImageElement.prototype, "new Image()'s prototype is HTMLImageElement.prototype "); 34 assert_equals(Object.getPrototypeOf(Image.prototype), HTMLElement.prototype, "Image.prototype's prototype is HTMLElement.prototype"); 35 36 const desc = Object.getOwnPropertyDescriptor(Image, "prototype"); 37 assert_false(desc.configurable, "Image.prototype is not configurable"); 38 assert_false(desc.enumerable, "Image.prototype is not enumerable"); 39 assert_false(desc.writable, "Image.prototype is not writable"); 40 }, "NamedConstructor creates the correct object structure."); 41 42 </script>