CSS3 :valid Selector
Select and style only if the value of the <input> element is valid:
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Definition and Usage
The :valid selector selects form elements with a value that validates according to the element's settings.
Note: The :valid selector only works for form elements with limitations, such as input elements with min and max attributes, email fields with a legal email, or number fields with a numeric value, etc.
Tip: Use the :invalid selector to select form elements with a value that does not validate according to the element's settings.
The numbers in the table specifies the first browser version that fully supports the selector.
CSS Selector :invalid