User blog comment:Trellar/Updates to Log In and Sign Up/@comment-799633-20120307163500/@comment-2200849-20120311195609

Backwards compatibility is a good idea in theory, but it becomes unsustainable quite quickly. Since browsers up to Netscape 4 and Internet Explorer 6 each had their respective freaks, designers had the choice of not writing any stylesheets at all or creating one for every of them, addressing these errors. Today, most websites generally choose a browser below which they don't provide support, typically based on market share and the goal audience. IE7 market share is around 7.25% currently. Besides, visiting Special:UserLogin works just fine as a backup method.