A toolbar is a common user interface pattern used to provide quick access to a group of commands, represented using controls such as press buttons, menus and other such controls.
This introduces a new `<toolbar>` HTML element. This will have a role of toolbar and include the default keyboard behaviour expected of a toolbar element.
Toolbars are commonly used components but today web authors need to handle the complex keyboard behaviour themselves.
While focusgroup makes this simpler it requires odd authoring patterns such as `<div focusgroup="toolbar">`. Making this a first-class element in HTML makes it easier for developers to pick up and use.