Accessible expanding and collapsing menu demo page

This is a demo of the script explained in Accessible expanding and collapsing menu. Please read that article for background and instructions.

• Category 1
  • Sub category 1a
  • Sub category 1b
  • Sub category 1c
  • Sub category 1d
• Category 2
  • Sub category 2a
  • Sub category 2b
  • Sub category 2c
  • Sub category 2d
• Category 3
  • Sub category 3a
  • Sub category 3b
  • Sub category 3c
  • Sub category 3d
• Category 4
  • Sub category 4a
  • Sub category 4b
  • Sub category 4c
  • Sub category 4d
• Category 5
  • Sub category 5a
  • Sub category 5b
  • Sub category 5c
  • Sub category 5d