placeholder should be empty and should change on selection of previous field code example

Example: placeholder select html

<!DOCTYPE html>
<head>
</head>
<body>
  <select name="food">
    <!-- The following line makes a placeholder -->
    <option value="" disabled selected hidden>select food</option>
    <option value="apple">apple</option>
    <option value="melon">melon</option>
  </select>
</body>

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Html Example

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