Chrome said the previous DOCTYPE was causing the page to be rendered in quirks mode. Also removed the xml attributes that nobody uses anymore (but Chrome didn't complain about that).
@@ -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" xml:lang="en" lang="en">
+<!DOCTYPE html>
+<html lang="en">
<head>
<meta charset="utf-8" />
<title>Inno Setup 6 Revision History</title>