Touch Friendly, CSS only Responsive Menu

This approach provides a touch friendly responsive menu without needing to rely on javascript for exposing secondary navigation on mobile devices.

Pros

• No Mo' JS - Does not rely on javascript or jQuery
• Isolated Behaviors - Media queries isolate the two different opening behaviors
• Sexy Animations - CSS animations work regardless of the number of list items
• Lean - Use of icon font means less http requests

Cons

• :Target jumpiness - The :target pseudo selector will "jump" down to the targeted element, which might not be the desired effect
• Not 100% tested - Needs to be tested on more devices including feature phones
• Not 100% finished - Tertiary navigation solution for mobile not explored yet

I hope to put this design into production on a future project, so any feedback is appreciated. Feel free to contact me on twitter @ micahgodbolt