Thanks!

So I can manually edit the URL, for other readers to get what’s required immediately.

?diff=split in the midst of this edition of the URL:

freebsd/freebsd-ports@352af02?diff=split#diff-01b82cb561ad6c59937469270ae848f3d63dc40228678b4a1ef02cdf48ecc889

Without this, if I’m not mistaken:

1. visually remember what’s on screen
2. key Home, or scroll up until the Split button becomes visible
3. click the button
4. as a different page loads, lose the anchor
5. scroll down to the altered view of what was memorised from the previous page.

I fixed the link in FreeBSD Forums.