For example, you have a combo box which contains 10 elements including the one that is currently selected. When you prompt to drop down the list to choose another, should the currently selected item also be in this list?
Answer
It should be listed. And the default behaviour of browser combox box dropdowns is to have the selected item as first item.
Otherwise, clicking the combo box, it would be unclear how to retain the currently selected value once the drop down has opened. While clicking outside the combo box might reselect or reset to the currently selected value, it is much clearer to have the currently selected value in the combo box listing, preferably as first item, thus allowing to reset to same value by clicking it. This also presents all choices in a clear and consistent way.
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