If it's based on the rendering engine in IE8/7, then pretty much everything on the web already works for it. No mainstream sites are "safely ignoring" Internet Explorer.
Well regular mainstream sites aren't, but mobile web applications/sites are making use of css3 and html5 features not present in IE8/7. In the mobile industry Microsoft has such a large marketshare that it will be safe to ignore the browser of Windows Mobile 7 (for now).
