menu

If a menu element's type attribute is in the list state, then the element either represents an unordered list of items (each represented by an li element), each of which represents a command that the user can perform or activate, or, if the element has no li element children, flow content describing available commands.

<menu type="toolbar">
<menu label="File">
<button type="button" onclick="file_new()">New...</button>
<button type="button" onclick="file_open()">Open...</button>
<button type="button" onclick="file_save()">Save</button>
</menu>
<menu label="Edit">
<button type="button" onclick="edit_cut()">Cut</button>
<button type="button" onclick="edit_copy()">Copy</button>
<button type="button" onclick="edit_paste()">Paste</button>
</menu>
</menu>
Read more on w3.org