Capturing the “scroll down” event?

Question

I\'m designing a very simple web page (HTML only), the only \"feature\" I want to implement is to do something when the user scrolls down the page, is there a way to capture

Answer 1

above answers are correct. Here's the vanilla Javascript approach.

document.addEventListener("mousewheel", function(event){
  if(event.wheelDelta >= 0){
    console.log("up")
  }else{
    console.log("down")
  }
})