Hey,
I think I answered the question.
Go to this page: http://www.seomoz.org/article/search-ranking-factors
Click on any of the tabs. Scroll a little bit and select a sentence and search for it on Google You will see that Google gives the right URL, however it doesn't highlight the text on SERPs.
I do believe there is less weight given in that case, since google doesnt even seem to highlight the sentence In the case of long tail keywords, it will pick the destination that delivers the intent right away. In the case of hidden / non visible divs, there are more steps required to get there.