title: I need to select an element "x" from a website, but the website loads element"x" too slowly
body: <p>I'm trying to select a table element from a website, and I am using document.querySelectorAll() to do so. However, the website, I believe, is retrieving that data from another sever and taking time to do so. Therefore, when I try using querySelectorAll() it comes out as undefined.</p>
  
  <p>I've tried adding some event listeners like window.addEventListener("load"), document.addEventListener("DOMContentLoaded), and window.onload() = funciton().</p>
  
  <p>I think those event listeners don't work because technically the window/DOM content is all officially loaded, but the table I needed is just being inserted later. Is there any way to wait for the table to be loaded so I can access it?</p>