https://admissions.ibsindia.org/ibsat/assets/JS/Restrict_Back.js

1// Function to prevent the back button
2function preventBack() {
3    window.history.pushState(null, "", window.location.href);
4}
5
6// Call preventBack when the page loads
7window.onload = function () {
8    preventBack();
9    // Listen for popstate event and call preventBack
10    window.addEventListener('popstate', function (event) {
11        preventBack();
12    });
13};
14
15function DisableBackButton() {
16    window.history.forward()
17}
18DisableBackButton();
19window.onload = DisableBackButton;
20window.onpageshow = function (evt) { if (evt.persisted) DisableBackButton() }
21window.onunload = function () { void (0) }