JSFiddle - React, Tailwind, and code Playground

HTML

<div>
  <p>There is some text here</p>
</div>

JavaScript

/*
* Use insertBefore to insert before :)
* Use appendChild to insert after
*/

(function(){
	document.addEventListener("keydown", keyDownBody, false);
  document.addEventListener("keydown", keyDownBody2, false);

  function keyDownBody(e) {
    var keyCode = e.keyCode;
    if(keyCode==65) {
      myFunction();
    }
  }
  
  function myFunction()
  {
  	var a = document.createElement("IMG");
    a.src="https://unsplash.it/200/300";
    document.body.appendChild(a,document.body.firstElementChild);
  }
  

  function keyDownBody2(e) {
    var keyCode = e.keyCode;
    if(keyCode==66) {
      myFunctionb();
    }
  }
  
  function myFunctionb()
  {
  	var b = document.createElement("IMG");
    b.src="https://unsplash.it/200/300";
    document.body.insertBefore(b,document.body.firstElementChild);
  }
})();