Mark-up has been used to convey information rather than images.
Layout and presentation have been controlled by using style sheets.
Documents make sense without style sheets.
Relative (as opposed to absolute) units have been used in mark-up language attribute values and style sheet property values.
Header elements have been used to convey document structure.
Correctly marked-up lists and list items in HTML have been used.
Quotations have been correctly marked up in HTML.