When the user clicks on the w3schools.com/html link, notify w3schools.com/trackpings:
The ping attribute works in Firefox, Chrome and Safari.
The ping attribute specifies a list of URLs to be notified if the user follows the hyperlink.
When the user clicks on the hyperlink, the ping attribute will send a short HTTP POST request to the specified URL.
This attribute is useful for monitoring/tracking.
The href attribute must be present in the <a> tag.
The ping attribute is new for the <a> tag in HTML5.
|URL||Specifies the URL to be notified if the user follows the hyperlink. Must be a space separated list of one or more valid URLs|