Just as the article says, I'd never heard of this. Looking at the example, the CSS seems rather unwieldy:

  -ms-scroll-chaining: chained;
  -ms-overflow-style: none;
  -ms-content-zooming: zoom;
  -ms-scroll-rails: none;
  -ms-content-zoom-limit-min: 100%;
  -ms-content-zoom-limit-max: 500%;
  -ms-scroll-snap-type: proximity;
  -ms-scroll-snap-points-x: snapList(100%, 200%, 300%, 400%, 500%);
  -ms-overflow-style: none;

I don't really know if any of that stuff actually belongs in CSS as the majority of people see it (and `snapList` certainly doesn't feel like CSS to me).