JSFiddle - React, Tailwind, and code Playground

HTML

<input type= button value ="Submit Form" onclick="adNetworkForm()" >

JavaScript

function adNetworkForm(){ 
    targetUrl = "http://somesite.com"    
        var myForm = document.createElement('form');
        myForm.method = 'post';
        //myForm.action = targetUrl;        
        
        var inpt1 = document.createElement('input');
        inpt1.setAttribute('name','a');
        inpt1.setAttribute('type', 'hidden')
        inpt1.value = "1"; 
        
        var inpt2 = document.createElement('input');
        inpt2.setAttribute('name','b');
        inpt2.setAttribute('type', 'hidden')
        inpt2.value = 2; 
        myForm.appendChild(inpt1);
        myForm.appendChild(inpt2);
        document.body.appendChild(myForm);
        myForm.submit(popitup(targetUrl));
        document.body.removeChild(myForm);
}
    
function popitup(url) {
    newwindow=window.open(url,'name','height=600,width=500');
    if (window.focus) {newwindow.focus()}
    return false;
}