A question about react

two questions about using autoComplete in antd

  1. when the property value is set, the default highlighted is invalid
  2. when I look at the component elements, I find that there is not a large box in the component, so the question is how does the scroll bar come out? is it an internal custom scroll bar?
Jul.03,2021

1. What does the default highlight mean?
2. The drop-down content is the

rendered under body by default.
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