latex2e-reference – A reference for LaTeX in HTML
The HTML hyper-document provides a thorough (though slightly dated) discussion of LaTeX 2e.
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LaTeX reference documents
Maybe you are interested in the following packages as well.
- comprehensive: Symbols accessible from LaTeX
- refenums: Define reference labels items with names of their own
- upref: Ensure references are upright
- fncylab: Alter the format of \label references