My attempt at creating a more accessible multi-level dropdown navigation menu, which responds to the follow user interactions at any screen size -

• Using a mouse to hover over the element
• Clicking on the element with a mouse
• Tapping on the element on a touchscreen
• Tabbing into and out of the element with a keyboard

Although I started this myself, I received a lot of valuable input from people in the comments section of the blog post and have updated the final menu. Check out the comments