I'm not sure that I understand your description of your problem, it seems incomplete. Can I try to repeat it to see if I understood correctly?
- Safari iPad.
- HTML5 Safaris ""
- . , .
- , , "".
- JavaScript. .
, , , blur , . .
HTML :
<input type="text" name="username" id="username">
<input type="password" name="password" id="password">
JavaScript :
document.getElementById('username').blur();
document.getElementById('password').blur();