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63), which will match HTML class attributes
containing the word ???warning.???
As such, the selector above would match the first line of text within any p element
that has a class attribute value of "warning" and is an adjacent sibling to an h2
element.
Finally, two or more selectors can be grouped, separated by commas (,); the
declaration block that follows applies to both selectors. Consider these two rules:
#main ol {
margin-left: 2em;
}
#main ul {
margin-left: 2em;
}
They can be grouped like this:
#main ol, #main ul {
margin-left: 2em;
}
You can read about selectors in detail in the selector reference section (p. 59).
General Syntax and
Nomenclature
The Ultimate CSS Reference 28
Declaration Blocks
Declaration blocks begin with a left curly brace, {, and end with a right curly brace,
}. They contain zero or more declarations (p. 28) separated by semicolons:
h2 {
color: #666;
}
A declaration block is always preceded by a selector (p. 26). We can combine
multiple rules that have the same selector into a single rule.


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