Text fragments are a new feature that you can include in URLs to highlight
specific text in the page you are linking to. You can read more about them
here (or read
the specification for them
here), but
essentially they let you link to a page and when the user arrives at the page
they will see a text fragment highlighted. The spec gives you some flexibility
for finding particular fragments of text based on some start and end searches,
but the basics are that you add #:~:text=text%to%highlight
at the end of your URL and everything just works (assuming your browser
supports it).
Note that this is for highlighting a specific block of text, not for finding
all occurrences in text. I can highlight a specific phrase. For
example, this link highlights a sentence on a post about Docker and port forwarding).
