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Thanks Kayden, that's it - I tried a different search term that also brought up that page as a result and that area was no longer highlighted. 

I came across this today when doing a Google search - a site that has a small promo code listed on their page shows a preview with that promo highlighted...I dug around their code a little bit, but couldn't find if it was something they were doing to manipulate their preview in the search results.

Is Google automatically highlighting promotions in previews, or did getmarried.com/magazine/ somehow manipulate the page to make their promo highlighted?  And if so, how?

You can see the site at http://www.getmarried.com/magazine/ and you can see the preview with the promo highlighted attached.

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