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並前往https://stackoverflow.com/questions/5805059/how-do-i-make-a-placeholder-for-a-select-box

How do I make a placeholder for a 'select' box? - Stack Overflow

<style> select:invalid { color: gray; } </style> <form> <select required> ... DOCTYPE html> <html> <head> <title>Placeholder for select tag drop-down ...

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