Secret link

You can put links on pages that don't look like links. When users hover over them, the mouse cursor doesn't show a pointer.

They're secret links. If you know about them, you can click on them. If you don't know about them, there's no reason to click.

Check this out:

See the link? No?

Here's the last bit of HTML:

<p>
  Fly accelerative like a modern teleporter.
  Collectives walk with pressure! The star
  <a href="https://xkcd.com/">is</a> more planet
  now than astronaut, ordinary and quickly ugly.
</p>

The word "is" on the last line is a link.

What?!

Here's some CSS:

a {
    color: black;
    text-decoration: none;
    cursor: text;
}

People use this sometimes to hide links to, for example, login pages. It doesn't offer real security, but it does make the page look cleaner.