WCAG 1.0 Double A Checkpoint 3.3

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“Use style sheets to control layout and presentation.”

Separate document structure from presentation using CSS. To determine if content is structural or presentational, create an outline of your document. Each point in the hierarchy denotes a structural change. Use structural markup to mark these changes and presentational markup to make them more apparent visually and aurally. Notice that horizontal rules will not appear in this outline and therefore are not structural, but presentational.

Checkmark icon Note: This technique addresses chapter, section, and paragraph structure. To determine structure within phrases, look for abbreviations, changes in natural language, definitions, and list items.

Reference

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Structure vs. Presentation