From 2f7f4cc0d7ba1f522d2f66cdc681395c332f636f Mon Sep 17 00:00:00 2001
From: Weston Ruter <weston@xwp.co>
Date: Mon, 10 Jul 2017 18:14:56 -0700
Subject: [PATCH] Use window.parent instead of window.top for sending resize
 messages

---
 components/sandbox/index.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/components/sandbox/index.js b/components/sandbox/index.js
index fac62404fe174b..436ac597619eaf 100644
--- a/components/sandbox/index.js
+++ b/components/sandbox/index.js
@@ -73,7 +73,7 @@ export default class Sandbox extends wp.element.Component {
 			( function() {
 				var observer;
 
-				if ( ! window.MutationObserver || ! document.body || ! window.top ) {
+				if ( ! window.MutationObserver || ! document.body || ! window.parent ) {
 					return;
 				}
 
@@ -81,7 +81,7 @@ export default class Sandbox extends wp.element.Component {
 					var clientBoundingRect, computedStyle;
 					clientBoundingRect = document.body.getBoundingClientRect();
 					computedStyle = getComputedStyle( document.body );
-					window.top.postMessage( {
+					window.parent.postMessage( {
 						action: 'resize',
 						width: clientBoundingRect.width + parseFloat( computedStyle.marginLeft ) + parseFloat( computedStyle.marginRight ),
 						height: clientBoundingRect.height + parseFloat( computedStyle.marginTop ) + parseFloat( computedStyle.marginBottom )