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<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>HTML sub tag</title> </head> <body> <!-- With Chemical Formulas --> <p>Chemical Formula of water is H<sub>2</sub>O</p> <!-- Variable Subscripts --> <p>The horizontal coordinates' positions are represented 'as <var>x<sub>1</sub></var> ... <var>x<sub>n</sub></var>!</p> </body> </html>