You have been working with (X)HTML and CSS for anywhere from 1-4 years. You prefer front end development because you're creative and visual and have a good eye for design. You write standards-compliant / semantic (X)HTML and CSS without Googling the syntax or using WYSIWYG editors.
You understand the difference between standards mode and quirks mode. You know what the box model hack is and what versions of IE it works for. You may love Firebug because it saves your life or you are so good you don't need it. You can use Gimp, Fireworks or Photoshop to cut up images and are handy with designing an icon or two in a pinch.
You are not uncomfortable working in the context of a complex Java web application even if you don't understand its intricacies. You won't get scared off by scripting markup like Velocity or JQuery showing up in the code here and there.
You are a self starter who loves working with technology and you stay up late putting the finishing touches on your code. You don't need to be told what to do to see what needs to get done. You are excited about working with a leading open source software company with cutting-edge opportunities at Fortune 500 companies around the world.