【CSS】IEでposition: fixed;をやったらガタガタ揺れる場合の対応策

<script>
  if(navigator.userAgent.match(/MSIE 10/i) || navigator.userAgent.match(/Trident\/7\./) || navigator.userAgent.match(/Edge\/12\./)) {
    $('body').on("mousewheel", function () {
    event.preventDefault();
    var wd = event.wheelDelta;
    var csp = window.pageYOffset;
    window.scrollTo(0, csp - wd);
    });
  }
</script>

参考: https://social.msdn.microsoft.com/Forums/ie/ja-JP/9567fc32-016e-48e9-86e2-5fe51fd67402/new-bug-in-ie11-scrolling-positionfixed-backgroundimage-elements-jitters-badly?forum=iewebdevelopment