1
IntroducIng cSS3
In this first chapter, I’ll cover the code
conventions used in this book and dis-
cuss some syntax that’s unique to CSS3,
but before getting to that, let me explain alittle about the history of CSS3. Obviously, you don’t
need to know its history to use CSS3, but I think hav-
ing some context about the current state of CSS3 is
important.
CSS3 is a specification in flux. Some parts of the spec are considered
stable and have been well implemented in modern browsers; other parts
should be considered experimental and have been partially implemented to
varying degrees; yet others are still theoretical proposals and have not been
implemented at all. Some browsers have created their own CSS properties
that aren’t described in any CSS3 specification and perhaps never will be.
All of this means that knowing how the standardization process works
and the levels of implementation for each new property is vital to under-
standing how you can use CSS3 in your code both now and in the future.
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