Defined Function Undefined

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I have this JS:

 document.getElementById("config2").addEventListener("click", function(){
   config3();
   console.log("In Function config.onclick()...");
 });
 
 function config3()
 {
   document.body.innerHTML+="<div style=\"opacity:0;\" class=\"popoutcont\" id=\"formcont\"><div style=\"opacity:0;\"><div class=\"popoutform\"></div></div>";
   setInterval(function(){document.getElementById("formcont").style.opacity+=0.01;if(document.getElementById("formcont").style.opacity===1){clearInterval(this)}}, 1);
   console.log("In Function Config...");
 }

And this HTML:

<p class='spectxt' style='font-weight:normal;' id='config2'><strong>Payload Configuration:</strong> Seats: 2</p>"

First of all, the event never occurs. No output is sent to the console. Second, the Chrome DevTools JS Console says that config3 is undefined when I call the function. Why is this happening and what is causing it?

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On

run your startup code on

<body onload=""> 

since your html content is not loaded yet