Where do you draw the line between "content" and "mark-up"? * Word break nearly always gets treated as content, denoted by the space character. * Line break c

Where do you draw the line between "content" and "mark-up"? * Word break nearly always gets treated as content, denoted by the space character. * Line break can be either: '\n' or <br>. * Paragraph break is usually treated as mark-up: <p>. Is there a good reason for that, or is it just historical accident?