I have the following code:
<form method='post' action='https://cieloecommerce.cielo.com.br/transactional/order/buynow' target='blank'><input type='hidden' name='id' value='00000000-0000-0000-0000-000000000000' /><input type='image' name='submit' alt='TESTAR' /></form>
It opens a new tab with the sky pay screen, I wanted it when you press the button, it opens open the screen on the same tab, and does not open a new tab.