When you need your web page automatic refresh in 5 second or any second, use this meta tag. it's a simple code, put it between HEAD tag in your web page.
Overview
This script easy but powerful. Many websites use this scripts to redirect to another page or refresh the same page, for example, my website updates in every 10 minutes and I want to show user my latest content then I put this script to my page and set it refreshs in every 10 minutes
Code
<HEAD>
<meta http-equiv='refresh' content='2;url='file_name or URL'>
</HEAD>
// content = time (second)
// file_name = name of file you want to refresh or redirect
// file_name = name of file you want to refresh or redirect