From 8b653f89bca2870e099da584f19f06b7ab76fc53 Mon Sep 17 00:00:00 2001
From: Niklas von Hertzen <niklasvh@gmail.com>
Date: Thu, 7 Dec 2017 16:16:22 +0800
Subject: [PATCH] Prevent generated iframe from getting re-rendered

---
 src/Clone.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/Clone.js b/src/Clone.js
index c60cc14..f156bdd 100644
--- a/src/Clone.js
+++ b/src/Clone.js
@@ -11,6 +11,8 @@ import {copyCSSStyles} from './Util';
 import {parseBackgroundImage} from './parsing/background';
 import CanvasRenderer from './renderer/CanvasRenderer';
 
+const IGNORE_ATTRIBUTE = 'data-html2canvas-ignore';
+
 export class DocumentCloner {
     scrolledElements: Array<[HTMLElement, number, number]>;
     referenceElement: HTMLElement;
@@ -235,7 +237,8 @@ export class DocumentCloner {
         for (let child = node.firstChild; child; child = child.nextSibling) {
             if (
                 child.nodeType !== Node.ELEMENT_NODE ||
-                (child.nodeName !== 'SCRIPT' && !child.hasAttribute('data-html2canvas-ignore'))
+                // $FlowFixMe
+                (child.nodeName !== 'SCRIPT' && !child.hasAttribute(IGNORE_ATTRIBUTE))
             ) {
                 if (!this.copyStyles || child.nodeName !== 'STYLE') {
                     clone.appendChild(this.cloneNode(child));
@@ -496,6 +499,7 @@ const createIframeContainer = (
     cloneIframeContainer.width = bounds.width.toString();
     cloneIframeContainer.height = bounds.height.toString();
     cloneIframeContainer.scrolling = 'no'; // ios won't scroll without it
+    cloneIframeContainer.setAttribute(IGNORE_ATTRIBUTE, 'true');
     if (!ownerDocument.body) {
         return Promise.reject(
             __DEV__ ? `Body element not found in Document that is getting rendered` : ''