Loading a new script programatically in a Vanilla JS


This Content is from Stack Overflow. Question asked by Andrew Newby

I’m using Modernizr to check if the browser support intersectionobserver. If not, it should load a Polyfill we have that should do the trick. However, it seems that in Chrome < v50, it doesn’t do as expected:

Uncaught TypeError: document.body.append is not a function 

The code is:

if (Modernizr.intersectionobserver) {
    // supported already
} else {
   const script = document.createElement('script');
    script.id = 'pollyfill-intersection';
    script.src = 'https://www.example.com/2022/js/lib/polfill/IntersectionObserver.js';
    //script.async = true;

What am I doing wrong? Surely even a 2016 version of Chrome has document.body.append() ? Could the issue be a “race” one, where the DOM hasn’t loaded before my code runs?


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