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16 ώρες πριν · In CSS, selectors declare which part of the markup a style applies to by matching tags and attributes in the markup itself. Selector types. Selectors may apply to the following: all elements of a specific type, e.g. the second-level headers h2; elements specified by attribute, in particular: . id: an identifier unique within the document, denoted in the selector language by a hash prefix e.g. #id