When you load youtube videos, the progress/loading indicator (thin red line) is on the very top of the page. Any ideas, what UI component library has this (or similar) control?

Nice, thanks!

The approach itself was popularized by Turbolinks (now called Turbo) https://turbo.hotwired.dev/

The actual effect is pretty straightforward CSS. Many tutorials out there. I have hand-rolled it at a few places. Can't find the one that I used -- but this one looks like it should solve your requirement https://idiallo.com/blog/loading-bar-for-page-load

@loud-glass-33663: Thanks. Will probably end up turning this into a new-hire interview question 😂