From a6bee7783d024602b62fa5a4471a9ed407cecb86 Mon Sep 17 00:00:00 2001
From: Wouter Vroege <wouter@woutervroege.nl>
Date: Sun, 5 Apr 2020 11:47:59 +0200
Subject: [PATCH] replace getAttributeNames() with for ...in loop to fix Edge
 <= 17 support

Signed-off-by: Wouter Vroege <wouter@woutervroege.nl>
---
 src/dom-properties-mixin.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/dom-properties-mixin.js b/src/dom-properties-mixin.js
index 64b2204..4c6af19 100644
--- a/src/dom-properties-mixin.js
+++ b/src/dom-properties-mixin.js
@@ -26,7 +26,7 @@ export const DOMProperties = (SuperClass) => class extends SuperClass {
 
   static __saveInitialAttributeValues() {
     const attrValues = new Map();
-    this.getAttributeNames().map(attrName => attrValues.set(attrName, this.getAttribute(attrName)));
+    for(var attrName in this.attributes) attrValues.set(attrName, this.getAttribute(attrName));
     this.__initialAttributeValues = attrValues;
   }