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- <!DOCTYPE html>
- <!-- fieldset with invalid barred for constraint validation element -->
- <html>
- <head>
- <style>
- fieldset:valid { display: none ;}
- </style>
- <script>
- function onloadHandler()
- {
- document.getElementById("fieldset").appendChild(document.getElementById('i'));
- document.documentElement.className = '';
- }
- </script>
- </head>
- <body onload="onloadHandler();">
- <input required readonly id="i">
- <fieldset id="fieldset">
- </fieldset>
- </body>
- </html>
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