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<a href="https://docs.octothorp.es" rel="octo:octothorpes">Read more about backlinks</a>The idea of a backlink is as old as the concept of a hyperlink, but they’re not as widely implemented as one-way links.
Here's what this page has sent to OP
BACKLINKS
<a href="https://docs.octothorp.es" rel="octo:octothorpes">Read more about backlinks</a>
OP can track regular links, not just hashtags. So if you use OP to link to a page, that page can find out about it. If they link back to you, that becomes a backlink. It’s as simple as that.