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<!DOCTYPE> <html class="reftest-wait"> <style> input:invalid { display: none; } </style> <script> function onloadHandler() { document.getElementById('e').setCustomValidity('foo'); document.documentElement.className=''; } </script> <body onload="onloadHandler();"> <form> <input id='e'> <button type='submit'>Submit!</button> </form> </body> </html>