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並前往https://newbedev.com/detect-if-an-input-has-text-in-it-using-css-on-a-page-i-am-visiting-and-do-not-control

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

It is possible, with the usual CSS caveats and if the HTML code can be ... #foo:invalid { outline: solid red 2px; } </style> <input id=foo required>.

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