JS workflow
HTML
<div id="output"></div>
JavaScript
const output = document.querySelector('#output');
// https://jsfiddle.net/dizel3d/svb54emm/
const iframeSrc = '//fiddle.jshell.net/dizel3d/svb54emm/show/';
[...Array(4)].forEach((_, i) => {
const iframe = document.createElement('iframe');
iframe.name = i;
iframe.width = 1;
iframe.height = 1;
iframe.src = iframeSrc;
output.appendChild(iframe);
});