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Thick Skull
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When you have thousands of lines to work with on one page, it can be rather hard to keep everything straight and perfectly functional. At that point in a page's life, it can be very easy to make one single mistake. Said mistake can be hard to find, and any fix that you make might make it worse.
If this kind of thing happens, backup the regular code first so if something does go wrong, then you can easily go back so you can try something else.