When using the keyboard to navigate a web page by tabbing, block level links do not highlight and take the page focus. This is not good for keyboard only users as they will not be able to access block level links via the keyboard.
What browser are you seeing this with, and on which operating system? In Safari, I get imaged selected when Option-tabbing. The test I used: <a href="#"><img src="http://images.apple.com/home/images/hero.jpg"></a> <a href="#"><img src="http://images.apple.com/home/images/hero.jpg"></a>
Created attachment 219774 [details] test case
works in attached test case. closing.