diff --git a/app/controllers/wiki_controller.rb b/app/controllers/wiki_controller.rb
index fa9fe080..303b232a 100644
--- a/app/controllers/wiki_controller.rb
+++ b/app/controllers/wiki_controller.rb
@@ -71,7 +71,7 @@ class WikiController < ApplicationController
export_pages_as_zip(html_ext) do |page|
renderer = PageRenderer.new(page.revisions.last)
rendered_page = <<-EOL
-
+
#{page.plain_name} in #{@web.name}
diff --git a/app/views/layouts/default.rhtml b/app/views/layouts/default.rhtml
index 620b7925..79dba5dc 100644
--- a/app/views/layouts/default.rhtml
+++ b/app/views/layouts/default.rhtml
@@ -1,4 +1,4 @@
-
+
diff --git a/app/views/layouts/error.html.erb b/app/views/layouts/error.html.erb
index 6659df53..5c03dfce 100644
--- a/app/views/layouts/error.html.erb
+++ b/app/views/layouts/error.html.erb
@@ -1,4 +1,4 @@
-<!DOCTYPE html>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1 plus MathML 2.0 plus SVG 1.1//EN" "http://www.w3.org/2002/04/xhtml-math-svg/xhtml-math-svg-flat.dtd" >
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>
diff --git a/app/views/wiki/s5.rhtml b/app/views/wiki/s5.rhtml
index ccbb8c37..ea0131c3 100644
--- a/app/views/wiki/s5.rhtml
+++ b/app/views/wiki/s5.rhtml
@@ -1,5 +1,4 @@
-<!DOCTYPE html>
-
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1 plus MathML 2.0 plus SVG 1.1//EN" "http://www.w3.org/2002/04/xhtml-math-svg/xhtml-math-svg-flat.dtd" >
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
diff --git a/app/views/wiki/source.html.erb b/app/views/wiki/source.html.erb
index 1ef02b0e..952cf56a 100644
--- a/app/views/wiki/source.html.erb
+++ b/app/views/wiki/source.html.erb
@@ -1,4 +1,4 @@
-<!DOCTYPE html>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1 plus MathML 2.0 plus SVG 1.1//EN" "http://www.w3.org/2002/04/xhtml-math-svg/xhtml-math-svg-flat.dtd" >
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>