What History API feature is being configured in this code?
if (window.history.scrollRestoration) {
// Disable automatic scroll restoration
window.history.scrollRestoration = 'manual';
// Track scroll position ourselves
window.addEventListener('beforeunload', function() {
const scrollPos = window.scrollY;
sessionStorage.setItem('scrollPos', scrollPos);
});
// Restore scroll position when appropriate
window.addEventListener('DOMContentLoaded', function() {
const scrollPos = sessionStorage.getItem('scrollPos');
if (scrollPos) {
window.scrollTo(0, parseInt(scrollPos));
sessionStorage.removeItem('scrollPos');
}
});
}
This code configures the scroll restoration behavior through the History API: 1) window.history.scrollRestoration controls how browsers handle scroll position during navigation, 2) Setting it to 'manual' disables the browser's automatic scroll position restoration, 3) The default value is 'auto', where browsers automatically restore scroll positions, 4) The code implements a custom scroll position tracking system using sessionStorage, 5) It saves the scroll position before page unload and restores it after the new page loads, 6) This approach gives developers precise control over scrolling behavior during navigation, 7) It's particularly useful for single-page applications or infinite scrolling pages where default behavior might not work well, 8) This pattern demonstrates taking control of browser behavior that's typically automatic to implement custom user experiences.