JSFiddle - React, Tailwind, and code Playground

HTML

<iframe id="something"></iframe>

JavaScript

var iframe = document.getElementById('something');
var iframeEvent = new Event('iframe-keypress');

document.addEventListener('keypress', function (e) {
    iframe.dispatchEvent(iframeEvent);
});

iframe.addEventListener('iframe-keypress', function (e) {
    console.log(e);
});