Visual Studio 2010's "New (CSS) Style" window does not contain all CSS styles availabe?

Question

I thought the "New Style" window in VS 2010 contains all the CSS styles you can apply, but it does not seem so. For example I could not find the "max-width" style which I intend to apply to a <img> tag to fit the image in screen. However I did find the "max-width" style from the "CSS Properties" window.

Does that mean the "New Style" feature cannot be trusted?