Wow, when did MDN start scrolljacking?
I use a browser extension [1] which provides vim-like bindings for Chrome, and sites that scrolljack severely mess up the scroll up/down functionality.
It's hard to tell there's scrolljacking just by using your mousewheel, but if you try running `window.scrollBy(0, 500);` in your developer console, you'll see the easing being applied. Try the same code on a site without scrolljacking (like the HN front page) and you'll see it jumps directly to the destination.
You'd think one of the largest advocates for web standards and accessibility would know better!