:: Steps to follow:
» copy and paste the HTML code below and save as a document (txt).
» name/rename the file: responsivator.html
» upload the file in the same folder where your index page is
» type in your browser: www.YourWebsite.com/responsivator.html (replace YourWebsite.com with the URL of your website)
It's simple as 1..2...3!
*** You may also download the file, unzip it and upload onto your website in: RAR (responsivator.rar) or ZIP (responsivator.zip) format
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Responsive Design Testing</title>
<style>
body { margin: 20px; font-family: sans-serif; overflow-x: scroll; }
.wrapper { width: 6000px; }
.frame { float: left; }
h2 { margin: 0 0 5px 0; }
iframe { margin: 0 20px 20px 0; border: 1px solid #666; }
</style>
</head>
<body>
<div class="wrapper">
<div class="frame">
<h2>320 × 480 <small>(mobile)</small></h2>
<iframe src="./" sandbox="allow-same-origin allow-forms" seamless width="320" height="480"></iframe>
</div>
<div class="frame">
<h2>480 × 640 <small>(small tablet)</small></h2>
<iframe src="./" sandbox="allow-same-origin allow-forms" seamless width="480" height="640"></iframe>
</div>
<div class="frame">
<h2>768 × 1024 <small>(tablet - portrait)</small></h2>
<iframe src="./" sandbox="allow-same-origin allow-forms" seamless width="768" height="1024"></iframe>
</div>
<div class="frame">
<h2>1024 × 768 <small>(tablet - landscape)</small></h2>
<iframe src="./" sandbox="allow-same-origin allow-forms" seamless width="1024" height="768"></iframe>
</div>
<div class="frame">
<h2>1200 × 800 <small>(desktop)</small></h2>
<iframe src="./" sandbox="allow-same-origin allow-forms" seamless width="1200" height="800"></iframe>
</div>
</div>
</body>
</html>
:: The most popular screen resolutions in the United States for 2012
(1st) 1366x768, 17.05% -- 15" to 17" laptops designed for HDTV
(2nd) 1024x768, 14.77% -- 17" desktop screen
(3rd) 1280x800, 13.08% -- 15.4" widescreen laptops
(4th) 1920x1080, 7.24% -- 23" to 27" desktop screen
(5th) 1440x900, 7.19% -- 19" to 21" desktop widescreen
(6th) 1280x1024, 5.91% -- 19" desktop screen
(7th) 1600x900, 5.91% -- 17.3" laptop screen
(8th) 320x480, 5.54% -- iPhones
(9th) 768x1024, 5.45% -- iPad
(10th) 1680x1050, 3.94% -- 20" to 22" desktop widescreen