User:TripleShortOfACycle/global.js

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// When the user scrolls the page, execute myFunction
window.onscroll = function() {myFunction()};

// Get the header
var headerContainer = document.getElementById("mw-header-container");

var header = document.getElementById("mw-header");

// Get the offset position of the navbar
var sticky = headerContainer.offsetTop;

// Add the sticky class to the header when you reach its scroll position. Remove "sticky" when you leave the scroll position
function myFunction() {
  if (window.pageYOffset > sticky) {
    // headerContainer.removeChild(header);
    headerContainer.style.display = "None";
  } else {
    headerContainer.style.display = "";
  }
}