zy108830

<form>
    <input type="radio" id="test" name="test" value="0" oninvalid="this.setCustomValidity('Click me')" onclick="clearValidity();" required>Zero<br> 
    <input type="radio" name="test" value="1" onclick="clearValidity()" class="wrapper">One <br>
    <input type="radio" name="test" value="2" onclick="clearValidity()" class="wrapper">Two <br>
    <input type="submit">
</form>

<script>
    function clearValidity(){
        document.getElementById('test').setCustomValidity('');