A drawer is a panel that slides onto the page. Drawers come in different sizes, with options for headers, footers, and backdrops. All drawers slide in from the right.
A drawer without a backdrop allows a user to continue to interact with the rest of the page. This can be useful when you wants users to have the ability to interact with the page and the drawer at the same time.
Drawers without a backdrop are closed through an explicit control. This is typically through clicking a ×, a Drawer footer button, or a labeled button on the page. Clicking outside the drawer should not close it.
A backdrop restricts user interaction to just the Drawer. This is useful when a task is focused. Drawers with backdrops close similar to the Modal component.
When a workflow is mandatory, the close functionalities — clicking the backdrop or × — can be removed. A user would have to complete a task to proceed.
When a Drawer is being used as an informational display, or supplementary to a page task, a backdrop is usually not needed on a Drawer. When a Drawer is an essential part of a workflow, or involves a lot of data manipulation where data conflicts with the page can occur, a backdrop is preferred.