How to display sub menus on mobile?

1. How do I display sub menus in HTML?
2. How do I access submenu?
3. What is a sub navigation bar?

How do I display sub menus in HTML?

Create A Subnav

Use any element to open the subnav/dropdown menu, e.g. a <button>, <a> or <p> element. Use a container element (like <div>) to create the subnav menu and add the subnav links inside it. Wrap a <div> element around the button and the <div> to position the subnav menu correctly with CSS.

How do I access submenu?

Users using the keyboard to navigate a menu can access a submenu by pressing the right arrow key or collapse the submenu by pressing the left arrow key.

What is a sub navigation bar?

Sub-navigation — also known as local navigation — is the interface where visitors can find lower-level categories of a site's IA. These are typically sub-categories of the main navigation links.