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keep your <abbr>CSS</abbr> presentation layer and <abbr>HTML</abbr> content
layer separate. This is called "separation of concerns."
</p>
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color: chocolate;
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<dfn id="html"><abbr title="HyperText Markup Language">HTML</abbr> </dfn> is a
markup language used to create the semantics and structure of a web page.
</p>
<p>
A <dfn id="spec">Specification</dfn> (<abbr>spec</abbr>) is a document that
outlines in detail how a technology or API is intended to function and how it
is accessed.
</p>
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JavaScript Object Notation (<abbr>JSON</abbr>) is a lightweight
data-interchange format.
</p>
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