More or less --- read all about it

You've probably seen this, on Amazon, the opening lines of a book description, next to the image of the book cover with a Read more link underneath that yields a few more lines when clicked. So you click and read the rest of the description, perhaps 15 lines in total. And when you've reached the end, the end of the text, there's another link, which says...

"Read less"

(Just trying)