Why are spaces used to separate things in css

The space is known as the descendant combinator. blockquote cite selects any cite element within a blockquote element. Likewise for blockquote em and blockquote i.

In other words, it’s not “if a blockquote tag is embedded into a cite tag”, it’s the other way around (besides, you can’t place blockquotes in cites in the first place).

As you note, commas group selector sequences into the same rule.

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