:out-of-range

The :out-of-range pseudo selector in CSS matches input elements when their value is outside the range specified as being acceptable.

<input max="10" min="5" type="number">

input:out-of-range {
  border: 5px solid red;
}

I believe it’s only relevant on input[type=number]. Range inputs don’t allow values outside their min/max and it doesn’t make much sense on any other type of input. Perhaps text-y inputs with a max length, but the behavior on those in most browsers is to prevent entry past the max anyway.

The selector is defined in the Selectors Level 4 specification, alongside its counterpart, :in-range.

Demo

Just like the code above, this input will have a green border when its value is between 5 and 10.

Browser support

Related properties

Almanac on Jan 7, 2021

:in-range

input:in-range { border: 5px solid green; }

Sara Cope