Any content like an eye catcher picture

• Home
• Options
  • Nothing
  • Do Nothing
• Item 2
  • I2 Sub1
    • I2 S1 Sub1
    • I2 S1 Sub2
  • I2 Sub2
    • I2 S2 Sub1
    • I2 S2 Sub2
      • Possible
      • but no one
      • will need this
• Item 3
  • I3 Sub1
  • I3 Sub2

Example of a responsive navigation bar.
When the viewport's width is less than 600px the bar will turn into a toggle button.
If you push the button a popup menu will slide in from the right hand side.
When the bar has focus, you can use the "Arrow" keys to navigate through the menu.
The [ESC]-button will close the popup menu.