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Discussion on: Possibly the Most Useful CSS Trick

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Thibaut Allender

:placeholder-shown doesn't rely on focus so it would still work while navigating with the keyboard, but screen readers would still be lost if you wanted to dim the search button. Also, you'd have to use either the disabled attribute, or better, aria-disabled (it's considered bad practice to disable a button as you might not know what disabled it, so you should still be able click it and get a proper error message), but both would require some JS to dynamically change their value. So yeah, it can be a useful pseudo-class but it turns out to be tricky, rather than a "trick" ;-)