HTML img tag: title attribute vs. alt attribute?

Question

I was browsing Amazon and I noticed that when searching \"1TB\" if you hover the mouse cursor over the stars rating image, you only see the score if using IE. If you are u

Answer 1

I believe alt is required for strict XHTML compliance.

As others have noted, title is for tooltips (nice to have), alt is for accessibility. Nothing wrong with using both, but alt should always be there.