Every Cascade spec level from 3 to 6 contains the same text for the specificity of a declaration - "Each declaration has the same specificity as the style rule it appears in."

But as far as I can tell, nothing says what the specificity of a rule is. After all what is the specificity of this rule?

p, #x, .y { color: red }

I think the text should say something like "Each declaration has the same specificity as the highest specificity matching selector belonging to the rule it appears in."