Many comments so far seem to imply (perhaps not intentionally) that this syntax was intended only on the "right side" of the URI, but you can think of it more as adding qualifier-like information to (potentially) each path segment. So in /com/foo/bar you could further qualify foo (perhaps as /com/foo;color=yellow/bar). This can be combined with a (definitionally trailing) query string as well. Someone noted that Spring implements some support for this; the Eclipse Foundation's Jersey (Java REST toolkit) does as well if I remember right.
That's how I use matrix params in one of my Angular projects - these are very handy to put segment filter params into instead of query params. When you have parallel routes (page/dialog) and filtering everywhere, URLs stay much easier to reason about.
One thing many don't talk about is the social aspect of getting a concussion. An acquaintance has decided to try to do something about that: https://concussionbox.org/ (Disclaimer: no involvement/attachment with the site, just thought it was relevant here.)
At 21, I needed just about every dime I had to live on. If I had worked as hard as I could without affecting my grades, I could maybe have saved $2k.
In an index fund for 40 years with an average rate of return, after inflation, it would be worth about $35k.
Not enough money to make any difference at all, and to save any more would have probably had a negative rate of return because it would have negativity impacted my job prospects.
Now that I make more than enough money to save for an early retirement, I’m glad I had the experiences I did rather than save every penny I could through my 20s.