From 8ef195f9acf6918d4f29ff22d4453115c02adaf2 Mon Sep 17 00:00:00 2001
From: Robin North <robin@robinnorth.co.uk>
Date: Wed, 17 Jan 2018 19:12:12 +0000
Subject: [PATCH] Fix DOMException in switchElementsAlt()

Clone attribute nodes before setting on `oldEl` to prevent the following error:

```
DOMException: Failed to execute 'setNamedItem' on 'NamedNodeMap': The node provided is an attribute node that is already an attribute of another Element; attribute nodes must be explicitly cloned.
```
---
 lib/switches.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/switches.js b/lib/switches.js
index d87ae0b..86beff3 100644
--- a/lib/switches.js
+++ b/lib/switches.js
@@ -22,7 +22,7 @@ module.exports = {
     if (newEl.hasAttributes()) {
       const attrs = newEl.attributes;
       for (var i = 0; i < attrs.length; i++) {
-        oldEl.attributes.setNamedItem(attrs[i])
+        oldEl.attributes.setNamedItem(attrs[i].cloneNode())
       }
     }
 
-- 
2.49.1