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並前往http://bvgrth.blogspot.com/2018/09/detect-if-input-has-text-in-it-using.html

Detect if an input has text in it using CSS — on a page I ... - ttyjnu

CSS has no (pseudo) selectors for <input> value(s). See: <input>. The :empty selector refers only to child nodes, not input values.

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