Replace <input type=”submit”> in Gravity Forms to a <button> element. There’s an example in the Gravity Forms documentation, but it lacks the proper code to show your custom button text, and removes important attributes like the onclick that prevents multiple clicks.
This is not a perfect solution but it leaves the important onclick and tab index attributes intact, so it’s the best solution!
Add this to your functions.php file:
Thanks to Mannie Schumpert for the original post on GitHub