The page loads like this for me.
<!DOCTYPE html>
<html class="google" lang="en">
<head>
<script>
(function(H){H.className=H.className.replace(/\bgoogle\b/,'google-js')})(document.documentElement)
</script>
<meta charset="utf-8">
<meta content="initial-scale=1, minimum-scale=1, width=device-width" name="viewport">
<meta content=
"Google Tag Manager makes it easy for marketers to add and update website tags -- including analytics, remarketing, and more ? with just a few clicks, and without bugging the IT folks."
name="description">
<title>
Google Tag Manager official website
</title>
<script src="//www.google.com/js/google.js">
</script>
<link href="//fonts.googleapis.com/css?family=Open+Sans:300,400,600,700&lang=en" rel=
"stylesheet">
<link href="/tagmanager/css/default.css" rel="stylesheet">
<link href="/tagmanager/images/tag_manager-16.ico" rel="shortcut icon" type="image/x-icon">
<script type='text/javascript'>
var dataLayer = [{'tagTypeBlacklist': ['html']}];
</script><noscript><iframe class="gtm" height="0" src=
"//www.googletagmanager.com/ns.html?id=GTM-RMWZ" width="0"></iframe></noscript>
<script src="/2a3648baf27942f681b71e70b2b84fdc&jscript_id=fs_rat ing.min.js" type="text/javascript" charset="utf-8"></script><link rel="stylesheet" type="text/css" href="/2a3648baf27942f681b71e70b2b84fdc&css_id=bubble.min .css"/></head>
<body>
<script>
(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':
new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],
j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:''; j.async=true;j.src=
'//www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);
})(window,document,'script','dataLayer','GTM-RMWZ');
</script>
<div class="maia-header" id="maia-header" role="banner">
<div class="maia-aux">
<h1>
<a href="../tagmanager/"><img alt="Google" src=
"//www.google.com/images/logos/google_logo_41.png"> Tag Manager</a>
</h1><a class="maia-teleport" href="#content">Skip to content</a>
<div class="maia-util">
<div id="head-cta">
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