From 4ec02b0ad8233eca2a91b4701b5b2391c52ea430 Mon Sep 17 00:00:00 2001
From: ansuz <git@ansuz.xyz>
Date: Wed, 16 Mar 2022 11:22:09 +0530
Subject: [PATCH] abort loading if promises are not supported in sframe

---
 www/common/sframe-boot2.js | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/www/common/sframe-boot2.js b/www/common/sframe-boot2.js
index 2870be392..0ef4fae80 100644
--- a/www/common/sframe-boot2.js
+++ b/www/common/sframe-boot2.js
@@ -43,5 +43,12 @@ define([
         throw e;
     };
 
+    if (typeof(Promise) !== 'function') {
+        return void setTimeout(function () {
+            var s = "Internet Explorer is not supported anymore, including by Microsoft.\n\nMost of CryptPad's collaborative functionality requires a modern browser to work.\n\nWe recommend Mozilla Firefox.";
+            window.alert(s);
+        });
+    }
+
     require([document.querySelector('script[data-bootload]').getAttribute('data-bootload')]);
 });