HTML5 introduced the new attribute rel = “noreferer”, this tag is used with the tags link <a>, the purpose is, as the saying goes, to hide the referer or other words from the address which the visitor came from, or in other word, it will prevent browsers from sending the referrer.
This tag can be used on <a> or <area> elements:
<a rel=”noreferrer” href=”www.example.com”> Outbound Link</a>
On www.example.com’s header generated after user click the link, the HTTP referer field will be empty. Just like visitor came from typing directly on address bar.