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<!DOCTYPE html> <html> <head><title>Text Formatting</title></head> <body style="padding: 20px; font-family: Arial;"> <p>This is <strong>important</strong> and <em>emphasized</em>.</p> <p>Old price: <del>$100</del> — New price: <ins>$50</ins></p> <p>Chemical: H<sub>2</sub>O, Math: x<sup>2</sup></p> <p>Highlight: <mark>LearnCode</mark></p> </body> </html>
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