The view-source: Link

A link straight to a page's source code, from when view source was a destination.

In 2026: Partly. The view-source: scheme still works typed into the address bar of Firefox and Chrome, but clicking it in a page has been refused for many years, because framing or scripting a source view was abused. So the link below does nothing at all when clicked, silently, which for this library counts as a demonstration. The scheme was never formally standardised; it is a browser tradition.

Where it came from: Netscape Navigator's view-source: scheme, mid 90s. Link navigation to it was locked off across browsers in the 2000s after abuse.
Wikipedia ↗

<p><a href="view-source:https://xbawx.com/">View this site's source</a></p>

<p style="font:13px Verdana">Clicking does nothing: browsers refuse view-source:
navigation from links. Type the same thing into the address bar and it still
works fine.</p>