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These terms simply refer to
a speci?¬? c version of the CSS standard.
As with any technology, CSS
continues to be re?¬? ned. CSS2 is now
almost fully implemented in most
browsers; CSS3 has been de?¬? ned
for some time, but is supported
only partially by Firefox and Opera
and barely at all by IE7. More on
both later.
I??™ll always indicate if this applies
only to IE6 or to both IE6 and 7.
XHTML: GIVING STRUCTURE TO CONTENT 5
Content, Structure, and Presentation
So, following the W3C??™s Web standards recommendations, Stylin??™
shows you how to publish content by de?¬? ning its structure with
XHTML and then de?¬? ning its presentation with CSS.
1. Content is the collective term for all the text, images, videos,
sounds, animations, and ?¬? les (such as PDF documents) that
you want to deliver to your audience.
2. XHTML (eXtensible HyperText Markup Language) enables you
to de?¬? ne what each element of your content is. Is it a heading
or a paragraph? Is it a list of items, a hyperlink, or an image?
You determine this by adding XHTML markup to your content.
Markup comprises tags (the tag name is enclosed in angle
brackets < >) that identify each element of your content. You
create an XHTML element (hereafter just called an element) by
either surrounding a piece of content with an opening and a
closing tag like this

This tag de?¬? nes the text content as a paragraph

or, for content that is not text (an image, in this example), by
using a single tag
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