From 5bc62a4fa3d49a4e13407f1c4d241b728cdc57fb Mon Sep 17 00:00:00 2001
From: Thomas Weber <muffin@muffin.ink>
Date: Thu, 31 Mar 2022 15:05:11 -0500
Subject: [PATCH] Disable quirks mode in iframe extension worker

---
 src/extension-support/tw-iframe-extension-worker.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/extension-support/tw-iframe-extension-worker.js b/src/extension-support/tw-iframe-extension-worker.js
index 9eccebba..c57ac917 100644
--- a/src/extension-support/tw-iframe-extension-worker.js
+++ b/src/extension-support/tw-iframe-extension-worker.js
@@ -53,7 +53,8 @@ class IframeExtensionWorker {
 
         window.addEventListener('message', this._onWindowMessage.bind(this));
         const blob = new Blob([
-            `<body><script>window.__WRAPPED_IFRAME_ID__=${JSON.stringify(this.id)};${frameSource}</script></body>`
+            // eslint-disable-next-line max-len
+            `<!DOCTYPE html><body><script>window.__WRAPPED_IFRAME_ID__=${JSON.stringify(this.id)};${frameSource}</script></body>`
         ], {
             type: 'text/html'
         });