How to add HTML <button> formtarget Attribute

<!DOCTYPE html> <html> <body> <h1>The button formtarget attribute</h1> <form action="/action_page.php" method="get"> <label for="fname">First name:</label> <input type="text" id="fname" name="fname"><br><br> <label for="lname">Last name:</label> <input type="text" id="lname" name="lname"><br><br> <button type="submit">Submit</button> <button type="submit" formtarget="_blank">Submit to a new window/tab</button> </form> </body> </html>