"In contrast to the other browser developers, Microsoft's approach to standards support has been conservative. The company doesn't want to ever have to remove or fundamentally modify a feature that it has implemented due to changes in specifications. As such, it has taken a policy of only implementing those specifications that are unlikely to undergo any further changes. As a result, Internet Explorer 9 will compare unfavorably on sites like HTML5 Test, but Microsoft views this as far preferable to making developers have to alter their real-world applications just because a specification has changed. "