Header level concern with the stair of header element and importance level on DOM (Document Object Module). As we all know that, xhtml is the presentation of web document. Now, web site are becoming more accessible , So, that website are defined as data rather than information. Data should be transportable, accessible for multi device and technology plus philosophy for future technology . So, that website’s DOM should structure in such a way that it could carry more subjective and informative instead for visual appearance.

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