what does container prop do in the Drawer component in material-ui

I am reading the official document of material-ui’s Drawer component, and I found a container prop and I do not have an idea where it comes from. It is not mentioned in its API documentation. Is this one of the built-in react component’s props?

Below is a screenshot of the responsive drawer component from material-ui: https://material-ui.com/components/drawers/#responsive-drawer

enter image description here

Answer

Ok, I found that after your guidance, That prop is coming from the Modal props because it extends with Drawer Props.

container - HTML element | React.Component | func

HTML element, component instance, or function that returns either. The container will have the portal children appended to it.
By default, it uses the body of the top-level document object, so it's simply document.body most of the time.

Modal Props: https://material-ui.com/api/modal/

Please check here https://github.com/mui-org/material-ui/blob/5cc1d0fc8756534f181d55af02a5a0d65b486603/packages/material-ui/src/Drawer/Drawer.d.ts#L11