1400936-1.html (439B)
1 <!doctype html> 2 <style> 3 fieldset:invalid { 4 border: 10px solid red; 5 } 6 fieldset:valid { 7 border: 10px solid green; 8 } 9 input.foo { 10 color: green; 11 } 12 </style> 13 <div> 14 <fieldset id="fieldset"> 15 <div id="ancestor"> 16 <input type="text" id="requiredInput" required> 17 <input type="text" id="other"> 18 </div> 19 </fieldset> 20 </div> 21 <script> 22 window.onload = function() { 23 other.classList.add('foo'); 24 ancestor.remove(); 25 }; 26 </script>