Browser autofill | OneStepCheckout Help Center

Browser autofill

One Step Checkout does not support browser autocomplete because of the following reasons: browser autocomplete fills fields unpredictably, it does not fire field onchange events and its functionality may differ from browser to browser.

You can turn autocomplete off with the following, <form autocomplete="false">

in app/design/frontend/base/default/template/onestepcheckout/checkout.phtml
and also set autocomplete="false" on individual form fields in
app/design/frontend/base/default/template/onestepcheckout/billing_fields.phtml and