Simplified JavaScript Jargon
An A-Z of JavaScript jargon (although some of the “explanations” could do with de-jargonifying themselves).
Link tags: glossary
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Typography Deconstructed | A comprehensive guide to the anatomy of type.
A beautiful glossary of typographic terms.
Glossary | HTML5 Doctor
A very handy glossary of HTML5 from the medical professionals at HTML5 Doctor.