1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
<!DOCTYPE html> <html class='reftest-wait'> <head> <style> :invalid { display: none; } </style> </head> <script> function onloadHandler() { document.getElementById('b').setCustomValidity('foo'); document.documentElement.className = ''; } </script> <body onload='onloadHandler();'> <form> <button id='b' type='submit'></button> </form> </body> </html>