Comment by epolanski

Bisection is also useful when debugging css.

When you don't know what is breaking that specific scroll or layout somewhere in the page, you can just remove half the DOM in the dev tools and check if the problem is still there.

Rinse and repeat, it's a basic binary search.

I am often surprised that leetcode black belts are absolutely unable to apply what they learn in the real world, neither in code nor debugging which always reminds me of what a useless metric to hire engineers it is.