SelectorGadget is a bookmarklet (which works on pretty much any browser) or a Chrome Plugin that makes it easy to generate a CSS selector for writing CSS or scraping web pages to pick out only the bits you're interested in. Click on the part of the page you want, then click on a part you don't want (if there is one). Lets you pick out multiple bits and stack them into a single selector.
An excellent summary of CSS selectors!
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