diff --git a/public/index.html b/public/index.html
index c970659..983269f 100644
--- a/public/index.html
+++ b/public/index.html
@@ -1,22 +1,19 @@
 <!DOCTYPE html>
-<html>
+<html lang="en">
   <head>
     <meta http-equiv="content-type" content="text/html; charset=UTF-8">
-    <meta http-equiv="content-language" content="en">
-    <meta http-equiv="content-script-type" content="text/javascript">
-    <meta http-equiv="content-style-type" content="text/css">
     <meta name="description" content="This is the online markdown editor with live preview.">
 
     <link rel="stylesheet" type="text/css" href="css/style.css">
     <link rel="stylesheet" type="text/css" href="css/github-markdown.css">
     <link rel="icon" type="image/png" href="favicon.png">
 
-    <script type="text/javascript" src="js/jquery-1.6.1.min.js"></script>
-    <script type="text/javascript" src="js/jquery.autosize-min.js"></script>
-    <script type="text/javascript" src="js/marked.min.js"></script>
-    <script type="text/javascript" src="js/purify.min.js"></script>
-    <script type="text/javascript" src="js/ace/ace.js"></script>
-    <script type="text/javascript" src="js/main.js"></script>
+    <script src="js/jquery-1.6.1.min.js"></script>
+    <script src="js/jquery.autosize-min.js"></script>
+    <script src="js/marked.min.js"></script>
+    <script src="js/purify.min.js"></script>
+    <script src="js/ace/ace.js"></script>
+    <script src="js/main.js"></script>
 
     <title>Markdown Live Preview</title>
   </head>
@@ -107,7 +104,9 @@ This web site is using `markedjs/marked`.</div>
     </div>
 
     <div id="footer">
-      <div id="copyright"><a href="https://git.a2s.su/iiiypuk/markdown-live-preview"><img src="image/GitHub-Mark-Light-32px.png"></a></div>
+      <div id="copyright"><a href="https://git.a2s.su/iiiypuk/markdown-live-preview">
+        <img src="image/GitHub-Mark-Light-32px.png" alt="GitHub Logo"></a>
+      </div>
     </div>
   </body>
 </html>
