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...there's an extra reason for [the rule] in the "how-to" forums like HTML and CSS. People need to see the exact code that's causing the problem, not the site as it exists tomorrow or next week or in 2014 (for readers coming along later).
So you need to post the relevant HTML and CSS. Not the whole thing! Part of your job is to figure out which bits of the code are causing the problem. For example if the issue involves positioning of the header, we do not need to know what font the footer uses. Quote only as much code as you need to reproduce the problem.
Does the HTML and/or CSS use absolute links beginning in / slash? If so, it will only work locally if you have a pseudo-server like MAMP or WAMP. These are easy to use and install-- at least the Mac version is --and the basic versions are free, so you should go download it if you haven't already.