diff --git a/demo/v-bind.html b/demo/v-bind.html
index 7ee12f1..09ee2b1 100644
--- a/demo/v-bind.html
+++ b/demo/v-bind.html
@@ -6,12 +6,17 @@
     <meta http-equiv="X-UA-Compatible" content="ie=edfe">
     <script src="https://unpkg.com/vue@3.3.4/dist/vue.global.js"></script>
     <title>v-bind</title>
+    <style>
+        .active{
+            border: 1px solid red;
+        }
+    </style>
 </head>
 <body>
 <div id="app">
-    <img v-bind:src="imgSrc" v-bind:title="imgTitle">
-    <img :src="imgSrc" :class="isActive?'active':''">
-    <img :src="imgSrc" :class="{active:!isActive}">
+    <img v-bind:src="imgSrc" v-bind:title="imgTitle" alt="">
+    <img :src="imgSrc" :class="isActive?'active':''" alt="">
+    <img :src="imgSrc" :class="{active:!isActive}" alt="">
 </div>
 <script type="text/javascript">
     const App = {
