In this lesson, we extend off [Expand a Menu on a focus Event to Improve Navigation Accessibility](https://egghead.io/lessons/javascript-using-the-focus-event-to-improve-navigation-accessibility) to improve the navigation. We use a bit of JavaScript to collapse the submenu on blur. This is important to ensure that if someone cannot use a mouse, they are still able to close the menu. https://developer.mozilla.org/en-US/docs/Web/API/Element/blur_event