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The content of each page is organized in a structured hierarchy of titles and sub-titles.
Enable users to visualize the structure of content in the page improve referencing by making it easier for indexation robots to interpret content.
Structure the document using titles and sub-titles using the HTML h1 to h6 elements.
Check that the structure of the pages is logical (ie the h1 to H6 elements are used in growing order) by analyzing it with this tool: http://www.w3.org/2002/08/extract-semantic