diff --git a/gallery.html b/gallery.html
index d097768d..549b372a 100644
--- a/gallery.html
+++ b/gallery.html
@@ -1,5 +1,5 @@
-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html xmlns="http://www.w3.org/1999/xhtml">
+<!DOCTYPE html>
+<html lang="en">
 <head>
 <title>GPXSee - Screenshots</title>
 <meta http-equiv="Content-type" content="text/html; charset=utf-8"/>
@@ -8,7 +8,7 @@
 <link rel="stylesheet" href="css/gallery.css" type="text/css"/>
 <!--[if IE 6]><link rel="stylesheet" href="css/ie6.css" type="text/css" media="all" /><![endif]-->
 <!-- Global site tag (gtag.js) - Google Analytics -->
-<script type="text/javascript" async="async" src="https://www.googletagmanager.com/gtag/js?id=UA-110140219-1"></script>
+<script async src="https://www.googletagmanager.com/gtag/js?id=UA-110140219-1"></script>
 <script>
   window.dataLayer = window.dataLayer || [];
   function gtag(){dataLayer.push(arguments);}
diff --git a/index.html b/index.html
index 2fc62cb2..b0b7ec18 100644
--- a/index.html
+++ b/index.html
@@ -1,5 +1,5 @@
-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html xmlns="http://www.w3.org/1999/xhtml">
+<!DOCTYPE html>
+<html lang="en">
 <head>
 <title>GPXSee - GPS log file viewer and analyzer</title>
 <meta http-equiv="Content-type" content="text/html; charset=utf-8" />
@@ -7,11 +7,11 @@
 <link rel="icon" type="image/png" href="css/images/favicon.png"/>
 <link rel="stylesheet" href="css/style.css" type="text/css" media="all" />
 <!--[if IE 6]><link rel="stylesheet" href="css/ie6.css" type="text/css" media="all" /><![endif]-->
-<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
-<script type="text/javascript" src="js/jquery.jcarousel.js" ></script>
-<script type="text/javascript" src="js/js-func.js"></script>
+<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
+<script src="js/jquery.jcarousel.js" ></script>
+<script src="js/js-func.js"></script>
 <!-- Global site tag (gtag.js) - Google Analytics -->
-<script type="text/javascript" async="async" src="https://www.googletagmanager.com/gtag/js?id=UA-110140219-1"></script>
+<script async src="https://www.googletagmanager.com/gtag/js?id=UA-110140219-1"></script>
 <script>
   window.dataLayer = window.dataLayer || [];
   function gtag(){dataLayer.push(arguments);}
