I've been pondering this question: What exactly is the functional distinction between these two code snippets, if any? I'm not certain how the use of a comma impacts statements. Does the #page > have an influence on the link in the first example?
#page > a:visited, a:link{}
and
#page > a:link{}
#page > a:visited{}
Understanding CSS Selectors - Grouping
A group of selectors separated by commas combines the elements selected by each individual selector in the list.
To clarify, #page > a:visited, a:link represents two distinct selectors that are not related.
Therefore, the following:
#page > a:visited,
a:link {}
is not the same as:
#page > a:link {}
#page > a:visited {}
To achieve the same results, you must group the entire selector like this:
#page > a:link,
#page > a:visited {}
As a side note, if you were using a CSS preprocessor such as LESS, you could simplify the code like this:
#page > a {
&:visited,
&:link {
color: red;
}
}
This would compile to:
#page > a:visited,
#page > a:link {
color: red;
}
The symbol , acts as a separator between 2 different selectors, allowing them to share the same style definition.
Contrary to what some may think, the symbol #page > does not impact the selector following the ,.
For instance:
#page > a:link{}
#page > a:visited{}
Could also be written as:
#page > a:link,#page > a:visited{}
This is true only if they both have identical styles.
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