<meta name="referrer">
Decides how much of your address travels along when someone leaves the page.
It sets the whole document's Referer policy: what the browser tells the next server about where the visitor came from. The modern default, strict-origin-when-cross-origin, already trims path and query across origins — but the meta lets you tighten or loosen it.
no-referrer silences everything; unsafe-url sends the full URL and earned the prefix in its name for good reasons — URLs carry tokens and searches. The policy covers the whole page's requests and navigations, and is refined per element with the referrerpolicy attribute.
<meta name="referrer" content="no-referrer">