Image() constructor's arguments should not have default values

LayoutTests/fast/js/script-tests/custom-constructors.js

 description(
 "This test checks construction of objects with custom constructors."
 );
 
 // Image tests
 shouldBeNonNull("new Image()");
 shouldBeEqualToString("new Image().tagName", "IMG");
 
 shouldBe("new Image().height", "0");
 shouldBe("new Image().width", "0");
+shouldBe("new Image(0).width", "0");
+shouldBe("new Image(0, 0).height", "0");
 shouldBe("new Image(100).width", "100");
 shouldBe("new Image(100, 200).height", "200");
 shouldBe("new Image(-100).width", "-100");
 shouldBe("new Image(-100, -200).height", "-200");
 
+shouldBe("new Image().hasAttribute('height')", "false");
+shouldBe("new Image().hasAttribute('width')", "false");
+shouldBe("new Image(0).hasAttribute('height')", "false");
+shouldBe("new Image(0).hasAttribute('width')", "true");
+shouldBe("new Image(0, 0).hasAttribute('height')", "true");
+shouldBe("new Image(0, 0).hasAttribute('width')", "true");
+
 shouldBeEqualToString("new Image().outerHTML","<img>");
 // FIXME: shouldBeEqualToString strips quotes from the string.
 shouldBeEqualToString("new Image(100, 100).outerHTML.replace(/\"/g, \"'\")", "<img width='100' height='100'>");
 
 // Option tests
 shouldBeNonNull("new Option()");
 shouldBeEqualToString("new Option().tagName", "OPTION");
 
 shouldBeEqualToString("new Option().innerText", "");
 shouldBeEqualToString("new Option(null).innerText", "null");
@@ skipping 22 matching lines @@
 shouldBeEqualToString("new Option('somedata', 'somevalue', true).outerHTML.replace(/\"/g,\"'\")", "<option value='somevalue' selected=''>somedata</option>");
 
 // Audio tests
 shouldBeNonNull("new Audio()");
 shouldBeEqualToString("new Audio().tagName", "AUDIO");
 
 shouldBeEqualToString("new Audio().src", "");
 shouldBeEqualToString("new Audio().preload", "auto");
 shouldBeEqualToString("new Audio('http://127.0.0.1/someurl').src", "http://127.0.0.1/someurl");
 shouldBeEqualToString("new Audio('http://127.0.0.1/someurl').preload", "auto");