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UI for multi-select with at-least-one requirement?

UI for multi-select with at-least-one requirement?
  1. What is the best UI for multi selecting from a list?
  2. Which GUI element can be used to choose one value from a list of options?
  3. How to show multiple selected value in dropdown in HTML?

What is the best UI for multi selecting from a list?

A multi-select pillbox is a suitable option if the user is familiar with the list's content and knows precisely what they're searching for. By searching or simply scrolling through the list, they can quickly locate what they are looking for.

Which GUI element can be used to choose one value from a list of options?

Checkboxes allow the user to select one or more options from a set.

How to show multiple selected value in dropdown in HTML?

For windows: Hold down the control (ctrl) button to select multiple options. For Mac: Hold down the command button to select multiple options.

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