In Focus lets you, without any registration required, literally “highlight” a section of any webpage and provides a unique url address linking to it.
It’s very familiar to CiteBite. The primary difference between the two is that with CiteBite, you have to copy and paste the text you want highlighted. With In Focus, though, all you have to do is drag a box over on it, which makes it a bit easier to use.
I’ve used CiteBite to help narrow the sections of a site I want English Language Learners to read in order to find the answer to an Internet Scavenger Hunt, and I expect I’ll use In Focus in the same way.