I am busy learning Scala. As an exercise I am rebuilding a web scraper that I previously developed in Java. I am using jsoup to handle the actual extracting of data. I came across an excellent website that you can use to test jsoup. Try jsoup is an interactive demo for jsoup that allows you to see how it parses HTML into a DOM and test CSS selector queries.
It even lets you load your own web page. Just hit the Fetch URL button, paste the URL you want to test and have fun testing your CSS selectors.
Give it a try!