PostMessage Parent

HTML

<iframe id="iframe" src="https://jsfiddle.net/brenwell/q9kkdp3q/4/show">
</iframe >

CSS

iframe{
  border:none;
}

JavaScript

function resizeHandler(data) {
  var resp = {
    type: 'RESIZE',
    w: window.innerWidth,
    h: window.innerHeighthttps://jsfiddle.net/brenwell/q9kkdp3q/4/?utm_source=website&utm_medium=embed&utm_campaign=q9kkdp3q
  }
	document.getElementById('iframe').contentWindow.postMessage(resp, "*");
}

window.addEventListener('resize', resizeHandler);