HTML and CSS Reference
In-Depth Information
The
<nav>
element is intended for navigation,
both within the page itself, as in the Wikipedia
table of contents, and through the rest of the
website. You can have any number of
<nav>
elements on a page. On large sites, it's common
to have global navigation across the top
(in the
<header>
) and local navigation in a sidebar
(in an
<aside>
element).
The
<footer>
element generally appears at the end
of a document, a section, or an article. As with
the
<header>
element, its content is generally
metainformation—author details, legal informa-
tion, or links to related information. But it's valid
to include
<section>
elements within a footer—for
example, when marking up appendixes.
The
<small>
element often appears within a
<footer>
or
<aside>
element—it contains copy-
right information, legal disclaimers, and other
fine print. Note that it's
not
intended to make text
smaller. You may choose to style its contents
smaller than your main text, but, as with other
elements, its role is to describe its contents, not
prescribe presentation.
The HTML DOCTYPE
The
DOCTYPE
declaration optionally appears at the start of an
HTML
document. It comes from the Standard Generalized Markup Language
(SGML)
that was used to define previous versions of
HTML
in terms of
the language syntax. The
DOCTYPE
serves two practical functions:
It's used by
HTML
validation services to determine which version
the document uses.
❂
Browsers use the
DOCTYPE
to determine which rendering mode to use.
❂
