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Screen readers (used by blind or visually impaired users) rely on semantic tags to navigate pages. They can jump from <nav> to <main> to <footer> instantly. Using non-semantic tags creates a confusing and frustrating experience for these users.

The <header> element is not just for the top of your website. It represents introductory content for its nearest ancestor. This could be a site header with a logo and navigation, or it could be the header of a specific blog post containing the title and timestamp. html910.blogspot.com