Demo.html

<!DOCTYPE html>
<html>
  <html lang="en">
  <head>
    <meta charset="utf-8">
<!-- You should add the following <meta> viewport element to support responsive device scaling -->
    <meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1.0 maximum-scale=1.0" />
    <title>Internet Speed</title>
  </head>
<!-- Any wrapping containers around the iframe need to have width and height set to `100%` for a responsive iframe experience -->
  <body style="width: 100%; height: 100%;">
<!-- Replace the "src" property with your custom Test URL -->
<!--"your-company-name" is set up in your online configuration dashboard -->
    <iframe width="100%" height="650px" frameborder="0" src="http://your-company-name.speedtestcustom.com"></iframe>
<!--"You can use nperf custom web app instead of speedtest custom from Ookla -->
<!--"OpenSpeedTest is another Free and Open-Source Self-Hosted HTML5 SpeedTest -->
  </body>
</html>