Web developers: we are going to go out of our way to hide the scrollbars!

Users: but that makes it difficult to know how much of the text is left to read!

Web developers: don't worry, we'll add a non-standard UI element that signals this in some non-obvious, weird way!

@rysiek Special venom in my heart for the progress bars that hang out at the top of the page, because every time I scroll down that progress bar moves and the movement pulls my eyes off the text and back to the top of the page.

0/10 UX would strike with an axe.