From 1ab7072a333d1c00f5f577c14b28252d3500c6bf Mon Sep 17 00:00:00 2001
From: Demetrio Girardi <dgirardi@prebid.org>
Date: Tue, 16 Aug 2022 12:35:43 -0700
Subject: [PATCH] Remove <!doctype> from markup before rendering with
 postscribe

---
 src/utils.js | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/utils.js b/src/utils.js
index 7152b1ee..054cfc6b 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -31,8 +31,11 @@ export function writeAdUrl(adUrl, width, height) {
   document.body.appendChild(iframe);
 }
 
-export function writeAdHtml(markup) {
-  postscribe(document.body, markup, {
+export function writeAdHtml(markup, doc = document) {
+  // remove <?xml> and <!doctype> tags
+  // https://github.com/prebid/prebid-universal-creative/issues/134
+  markup = markup.replace(/\<(\?xml|(\!DOCTYPE[^\>\[]+(\[[^\]]+)?))+[^>]+\>/g, '');
+  postscribe(doc.body, markup, {
     error: console.error
   });
 }