Semantic navigation with the nav element | HTML5 Doctor - 1 views
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Previous/next buttons (or pagination) I would say yes to this because it is important to the overall structure and hierarchy of the blog/site
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Search form For me, a definite yes, but it is not mentioned in the spec. A search form is hugely important to the navigation of a site, particularly large sites which rely almost solely on their search engine.
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Breadcrumbs Again, I would say yes to this as well. Although breadcrumbs are not always necessary and can be used when not applicable, on large sites a breadcrumb trail can be an important navigation aid.
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Breadcrumbs Again, I would say yes to this as well. Although breadcrumbs are not always necessary and can be used when not applicable, on large sites a breadcrumb trail can be an important navigation aid.