From f11449d916a468651d4fd5024c37e3eebbc9941f Mon Sep 17 00:00:00 2001
From: Evan You <yyx990803@gmail.com>
Date: Wed, 20 Mar 2019 14:13:23 +0800
Subject: [PATCH] fix(core): only unset dom prop when not present

fix #9650
---
 src/platforms/web/runtime/modules/dom-props.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/platforms/web/runtime/modules/dom-props.js b/src/platforms/web/runtime/modules/dom-props.js
index 3e32246267..a5c3dc7f4a 100644
--- a/src/platforms/web/runtime/modules/dom-props.js
+++ b/src/platforms/web/runtime/modules/dom-props.js
@@ -19,10 +19,11 @@ function updateDOMProps (oldVnode: VNodeWithData, vnode: VNodeWithData) {
   }
 
   for (key in oldProps) {
-    if (isUndef(props[key])) {
+    if (!(key in props)) {
       elm[key] = ''
     }
   }
+
   for (key in props) {
     cur = props[key]
     // ignore children if the node has textContent or innerHTML,