When several coded characters are assembled and aligned, they configure a sentence, paragraph, clause, etc., in accordance with their semantics. Those sets of coded characters (sometime referred to as logical elements) configure an electronic document.
The assembles of coded characters are rendered and presented with particular presentation styles, for feasible understanding of their semantics.
Here I wish to emphasize the importance of presentation styles of character strings in electronic documents presentation, since they have their own meanings and have to be preserved when interchanging the electronic documents.