mod_pagespeed is an open-source Apache module that automatically optimizes web pages and resources on them.
websites using the $ symbol on their website - meaning it may accept payment in this currency used in Israel.
When running in a browser on a mobile phone, "format-detection" meta tag determines whether or not telephone numbers in the HTML content will appear as hypertext links. The user can click a link with a telephone number to initiate a phone call to that phone number.
A canonical link element is an HTML element that helps webmasters prevent duplicate content issues by specifying the "canonical", or "preferred".