Never use MSDN for information about anything non-MS-proprietary.
If you look up a standard property MSDN will tell you how IE implements it, which may or may not be how it's supposed to be implemented, but MSDN never distinguishes. Therefore its information with regard to anything non-MS is unreliable.
<nb>I'm not MS bashing here .. simply passing on advice because I value integrity of information ... and I've been embarrassed too many times
For MS-proprietary information it's second to none, but it's search facility is not so great; Google Site Search is much more reliable: "site:msdn.microsoft.com your search words"