:valid
Targets any form element that currently meets its requirements (like matching a 'pattern' or having content in a 'required' field). Unlike ':user-valid', this can match immediately on page load.
Quick example
input:valid {
background-color: #f0fff0;
/* highlights valid fields immediately */
}:valid Browser Support
Widely available Since 2015 96% global usage
This feature is well established and works across many devices and browser versions. It has been available across browsers since 2015.
Safe to use without fallbacks.
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