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Some properties accept special keyword values, which must not be enclosed in
quotes. String values, on the other hand, must be enclosed in single or double quotes.
URIs are expressed using the url() notation.
Color values can be expressed in a few different ways, each one providing a value
for the red, green, and blue channels. They can be expressed using a # character
followed by three or six hexadecimal digits, or via the rgb() notation, which requires
three comma-separated numerical values between 0 and 255, or three percentages.
CSS3 introduces even more methods for expressing color values.
Special characters can be specified using CSS escape notation??”a backslash followed
by a hexadecimal value. A whitespace character after a character escape is ignored.
All keywords within the control of CSS are case insensitive, but other values may
be case sensitive, depending on the markup language and the operating system of
the web server. A CSS parser should ignore the invalid or unsupported parts of a
style sheet.


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