Opening HTML form in new tab after submitted is easier than you expect. We use the target=”_blank” attribute, the same way as making a link open in new tab.
<form action="someaction.php" method="post" target="_blank"> ... </form>
Opening HTML form in new Window/Tab by using jQuery
Here is an alternative way for opening form in new tab by using jQuery in case you don’t like the first way. Paste this code under the form in your HTML.
And don’t forget to include the jQuery library in your head section.