As the tag select to make a constant immutable value?

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There are drop down menus which are present the two letters "c" and "to"

5bedacb80e1cc402243791.png

But when I open the drop down menu, those letters disappear. Tell me how this is done?

5bedace69af63204692927.png

How to achieve this effect like in the pictures?
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For example, the events focus and blur to clean up or put the letter u selected
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well, maybe in the html need to register these values during 11:00, not just 11:00
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