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The taglibrary wraps up some common functionality into single tags, ie the most simplest tag, the <e:footer /> tag simply outputs '</body></html>'. Other tags are quite complex so it's worth taking a look at the taglib documentation which is generated when the taglib is built. It just needs to be unpacked somewhere. See the Installation Guide for info on the taglibrary.
Some other tags also have their own styles applied to them by default. The source code to the taglibrary is readily available and it is all documented.
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