The :valid CSS pseudo-class

The :valid CSS pseudo-class represents any  <input> or other <form> element whose contents validate successfully. This allows to easily make valid fields adopt an appearance that helps the user confirm that their data is formatted properly.

input:valid {
  background-color: powderblue;

This pseudo-class is useful for highlighting correct fields for the user.

Here is browser support for this class:

broowser support

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