Writer 1

Write to an iframe using the window.frames property

by Morteza Mirmojarabian

HTML

<iframe name="myIframe"></iframe>
<button id="myButton">Write</button>

JavaScript

document.getElementById('myButton').addEventListener('click', function() {
  var iframeDocument = window.frames['myIframe'].document;
  iframeDocument.open();
  iframeDocument.write('Hello, world!');
  iframeDocument.close();
});