mpletion prediction string inside the text input,
appearing inline after the user's input cursor. 
However, `"inline"` _should not_ be used alone on a combobox because the assistive technologies and users are expecting a popup. 
A combobox can and often supports both inline forms of autocomplete in combination with having a popup element. 
Authors can use `aria-autocomplete="both"`. 
The inline completion string is visually highlighted and has a selected state.

The `aria-autocomplete` property is _not inte