JSFiddle - React, Tailwind, and code Playground

HTML

Open the console to see the iframe document we created.

JavaScript

// create the iframe and attach is to the document
var iframe = document.createElement("iframe");
iframe.setAttribute("scrolling", "no");
iframe.setAttribute("frameborder", "0");
document.body.appendChild(iframe);

// find the iframe's document and write some content
var idocument = iframe.contentDocument;
idocument.open();
idocument.write("<!DOCTYPE html>");
idocument.write("<html>");
idocument.write("<head></head>");
idocument.write("<body>this is the iframe</body>");
idocument.write("</html>");
idocument.close();

// now have at your creation in the console
console.log(idocument);