From e820d8a7a592179519323ca533280f011a43d27b Mon Sep 17 00:00:00 2001
From: Alexander Bolshakov <lextiz@gmail.com>
Date: Mon, 8 Aug 2016 18:19:48 +0300
Subject: [PATCH] Fixes #1190

---
 src/debuggability.js | 26 ++++++++++++++++++--------
 1 file changed, 18 insertions(+), 8 deletions(-)

diff --git a/src/debuggability.js b/src/debuggability.js
index 981feddee..e2a9dd085 100644
--- a/src/debuggability.js
+++ b/src/debuggability.js
@@ -143,14 +143,24 @@ Promise.hasLongStackTraces = function () {
 
 var fireDomEvent = (function() {
     try {
-        var event = document.createEvent("CustomEvent");
-        event.initCustomEvent("testingtheevent", false, true, {});
-        util.global.dispatchEvent(event);
-        return function(name, event) {
-            var domEvent = document.createEvent("CustomEvent");
-            domEvent.initCustomEvent(name.toLowerCase(), false, true, event);
-            return !util.global.dispatchEvent(domEvent);
-        };
+        if (typeof CustomEvent === "function") {
+            var event = new CustomEvent("CustomEvent");
+            util.global.dispatchEvent(event);
+            return function(name, event) {
+                var domEvent = new CustomEvent(name.toLowerCase(), event);
+                return !util.global.dispatchEvent(domEvent);
+            };
+        } else {
+            var event = document.createEvent("CustomEvent");
+            event.initCustomEvent("testingtheevent", false, true, {});
+            util.global.dispatchEvent(event);
+            return function(name, event) {
+                var domEvent = document.createEvent("CustomEvent");
+                domEvent.initCustomEvent(name.toLowerCase(), false, true,
+                    event);
+                return !util.global.dispatchEvent(domEvent);
+            };
+        }
     } catch (e) {}
     return function() {
         return false;