Adding a Back Button for Specific Pages in Survey

Question

I would like to add a back button that allows participants to navigate to the previous page within the survey(so back to the previous page/question), not to the previous page in their browser's history.

In the setting, I only can find the adding back button for "whole questionnaire".
I have also tried with the HTML code:

<button type="button" onclick="window.history.back();">Go Back</button>

However, it is only for the browser's history which will cause the answer wont be saved.

Is there a built-in feature for this specific functionality directly accessible via HTML?

thank you so much for the help!

Answer 1

The solution is this line of PHP code

option('backbutton', true);