diff --git a/README.md b/README.md
index b10ba4a..5050e69 100644
--- a/README.md
+++ b/README.md
@@ -11,4 +11,7 @@ instead of PHP.
 
 ## Resources
 
-* [Responsive Web Design - Introduction](https://www.w3schools.com/css/css_rwd_intro.asp)
+* [Responsive Web Design - Introduction](https://www.w3schools.com/css/css_rwd_intro.asp) (w3schools)
+* [Viewport concepts](https://developer.mozilla.org/en-US/docs/Web/CSS/Viewport_concepts) (Mozilla Development Network)
+* [Using media queries](https://developer.mozilla.org/en-US/docs/Web/CSS/Media_Queries/Using_media_queries) (Mozila Development Netork)
+* [Window: resize event](https://developer.mozilla.org/en-US/docs/Web/API/Window/resize_event)
diff --git a/index.html b/index.html
index 3e45116..b5a776d 100644
--- a/index.html
+++ b/index.html
@@ -2,6 +2,7 @@
 <html lang="en">
 <head>
 <meta charset="UTF-8">
+<meta name="viewport" content="width=device-width, initial-scale=1.0">
 <link href='https://fonts.googleapis.com/css?family=Ubuntu' rel='stylesheet'>
 <link href='https://fonts.googleapis.com/css?family=Ubuntu%20Condensed'
 rel='stylesheet'>
@@ -9,6 +10,8 @@ rel='stylesheet'>
 <style>
 @import url(css/elknernet.css);
 </style>
+<script>
+</script>
 </head>
 
 <body>
@@ -266,6 +269,7 @@ LTSP: Moving into the Mainstream</a></li>
 <strong> HTML </strong> Valid! </a>
 <a href="http://jigsaw.w3.org/css-validator/validator?uri=https://elkner.net/?profile=css3">
 <strong> CSS </strong> Valid! </a>
+<span id="winDisplay">Window width: <span id="scWidth"></span></span>
 </footer>
 
 </body>
