How to make a SVG Blur the Page content on mouse scroll for both Desktop and Mobile?

问题

The code works on Desktop but really sucks on Deceives so I assume I’m missing something. Iv read stuff and tried other hacks but I’m getting frustrated of reading and not understanding.

https://codepen.io/mikeloucas/pen/yLaYYGV

The scroll FX doesn't work while swiping up or down, it activates after I stop and then it stutters in and out. So odd. It worked in the Browsers emulator but this is not a TRUE device.

If any one could help, great!

html-svg part

    <svg style="position: absolute; top:-99999px" xmlns="http://www.w3.org/2000/svg">
      <filter id="svgBlur" x="-5%" y="-5%" width="110%" height="110%">
       <feGaussianBlur id="fltBlur" in="SourceGraphic" stdDeviation="0" />
      </filter>
    </svg>

    <div id=cont>
What is Lorem Ipsum?
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    <br />
Why do we use it?
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    <br />
Where does it come from?
Contrary to popular belief, Lorem Ipsum is not simply random text. It has roots in a piece of classical Latin literature from 45 BC, making it over 2000 years old. Richard McClintock, a Latin professor at Hampden-Sydney College in Virginia, looked up one of the more obscure Latin words, consectetur, from a Lorem Ipsum passage, and going through the cites of the word in classical literature, discovered the undoubtable source. Lorem Ipsum comes from sections 1.10.32 and 1.10.33 of "de Finibus Bonorum et Malorum" (The Extremes of Good and Evil) by Cicero, written in 45 BC. This book is a treatise on the theory of ethics, very popular during the Renaissance. The first line of Lorem Ipsum, "Lorem ipsum dolor sit amet..", comes from a line in section 1.10.32.
    <br />
Where can I get some?
There are many variations of passages of Lorem Ipsum available, but the majority have suffered alteration in some form, by injected humour, or randomised words which don't look even slightly believable. If you are going to use a passage of Lorem Ipsum, you need to be sure there isn't anything embarrassing hidden in the middle of text. All the Lorem Ipsum generators on the Internet tend to repeat predefined chunks as necessary, making this the first true generator on the Internet. It uses a dictionary of over 200 Latin words, combined with a handful of model sentence structures, to generate Lorem Ipsum which looks reasonable. The generated Lorem Ipsum is therefore always free from repetition, injected humour, or non-characteristic words etc.
    </div>

css part

    #cont {
    width:50%;
    font-size:2em;
    -webkit-filter: url(#svgBlur);
    filter: url("#svgBlur");
    -mos-filter: url(#svgBlur);
    -ms-filter: url(#svgBlur);
    -o-filter: url(#svgBlur);
     }

javascript part

//start the Blur
var blur = document.getElementById("fltBlur");
var prevY = 0;
var reqId;

//stop the Blur when not scrolling
window.onscroll = function() {
  cancelAnimationFrame(reqId);
  reqId = requestAnimationFrame(motionBlur)
    
      clearTimeout(this, 'scrollTimer');
    (this, 'scrollTimer', setTimeout(function() {
      var y = window.scrollY;  
            var n = Math.min(0, Math.abs(y - prevY));
  blur.setAttribute("stdDeviation" ,"0 " + n);
  prevY = y;
        console.log("Haven't scrolled in 0ms!");
    }, 0));
};

//Blur while scrolling
function motionBlur() {
  var y = window.scrollY;
  var n = Math.min(32, Math.abs(y - prevY));
  blur.setAttribute("stdDeviation" ,"0 " + n);
  prevY = y;
}

来源：https://stackoverflow.com/questions/65109026/how-to-make-a-svg-blur-the-page-content-on-mouse-scroll-for-both-desktop-and-mob