getElementById no longer returns elements whose NAME attribute matches.Fixed memory leaks (this means that scripts no longer need to remove event handlers onunload).Support for getters and setters using a syntax based on an ECMAScript 3.1 draft, that is completely incompatible with all other browsers.Dynamically created radio buttons now work properly.ownerElement and ownerDocument now exist.getAttribute now returns an empty string for unspecified attributes - this is spec compliant but the spec is incompatible with every other implementation.getAttribute and setAttribute now work correctly with previously special attributes like HREF, STYLE and CHECKED.Cludged namespace support in HTML instead of proper XHTML support.Table tags now correctly implicitly close paragraph tags.
Alternate sylesheets are now natively supported.Data URIs partially supported, but limited to images and linked resources like CSS files, not HTML files.Object fallback now works almost completely, but still has a few problems with resources from other Web sites.values are now correctly submitted instead of their innerHTML.element type now correctly defaults to "submit".