http://googleblog.blogspot.com/2009/09/jump-to-information-you-want-right-from.html
"Normally, a search snippet shows how a page, as a whole, relates to a your query by excerpting content that appears near and around where your query terms show on the page. But what if only one section of the page is relevant to your search?
That's where these new features can help, by providing links within the snippet to relevant sections of the page, making it faster and easier to find what you're looking for. Imagine, for example, that we're researching trans fats and cholesterol, and their effects on the body. If we start with a generic query like [trans fats], Google returns several results with lots of information about trans fats in general, including this result from Wikipedia:
Now, included with the snippet are links to specific sections within the page, covering different subtopics of trans fats. Since we're particularly interested in what's healthy and what's not, "Nutritional guidelines" is probably where the most relevant information is. Clicking this link will take you directly to that section, midway down the page."




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