The index argument for HTMLCollection item() api should not be optional

LayoutTests/fast/dom/script-tests/non-numeric-values-numeric-parameters.js

 description(
 'This tests the behavior of non-numeric values in contexts where the DOM has a numeric parameter.'
 );
 
 function nonNumericPolicy(template)
 {
     var x = 0;
     try {
         eval(template);
     } catch (e) {
@@ skipping 200 matching lines @@
 
 shouldBe("nonNumericPolicy('document.body.scrollLeft = x')", "'any type allowed'");
 shouldBe("nonNumericPolicy('document.body.scrollTop = x')", "'any type allowed'");
 
 // History
 
 // Not tested: go.
 
 // HTMLCollection
 
-shouldBe("nonNumericPolicy('document.images.item(x)')", "'any type allowed'");
+shouldBe("nonNumericPolicy('document.images.item(x)')", "'any type allowed (but not omitted)'");
 
 // HTMLInputElement
 
 shouldBe("nonNumericPolicy('document.createElement(\"input\").setSelectionRange(x, 0)')", "'any type allowed'");
 shouldBe("nonNumericPolicy('document.createElement(\"input\").setSelectionRange(0, x)')", "'any type allowed'");
 
 // HTMLOptionsCollection
 
 shouldBe("nonNumericPolicy('createHTMLOptionsCollection().add(document.createElement(\"option\"), x)')", "'any type allowed'");
 shouldBe("nonNumericPolicy('createHTMLOptionsCollection().remove(x)')", "'any type allowed (but not omitted)'");
@@ skipping 43 matching lines @@
 // NamedNodeMap
 
 shouldBe("nonNumericPolicy('document.body.attributes.item(x)')", "'any type allowed (but not omitted)'");
 
 // NodeIterator
 
 shouldBe("nonNumericPolicy('document.createNodeIterator(document, x, null, false)')", "'any type allowed'");
 
 // NodeList
 
-shouldBe("nonNumericPolicy('document.getElementsByTagName(\"div\").item(x)')", "'any type allowed'");
+shouldBe("nonNumericPolicy('document.getElementsByTagName(\"div\").item(x)')", "'any type allowed (but not omitted)'");
 
 // Range
 
 shouldBe("nonNumericPolicy('document.createRange().setStart(document, x)')", "'any type allowed (but not omitted)'");
 shouldBe("nonNumericPolicy('document.createRange().setEnd(document, x)')", "'any type allowed (but not omitted)'");
 shouldBe("nonNumericPolicy('document.createRange().comparePoint(document, x)')", "'any type allowed (but not omitted)'");
 shouldBe("nonNumericPolicy('document.createRange().isPointInRange(document, x)')", "'any type allowed (but not omitted)'");
 
 // Selection
 
@@ skipping 326 matching lines @@
 ../../../../WebCore/svg/SVGSVGElement.idl:                 attribute float currentScale
 
 ../../../../WebCore/svg/SVGMatrix.idl:        attribute double a;
 ../../../../WebCore/svg/SVGMatrix.idl:        attribute double b;
 ../../../../WebCore/svg/SVGMatrix.idl:        attribute double c;
 ../../../../WebCore/svg/SVGMatrix.idl:        attribute double d;
 ../../../../WebCore/svg/SVGMatrix.idl:        attribute double e;
 ../../../../WebCore/svg/SVGMatrix.idl:        attribute double f;
 
 */