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<!DOCTYPE html> <html> <head> <title>Title of the document</title> <style> ol { counter-reset: item; } li { display: block; color: #666666; } li:before { content: counters(item, ".") " "; counter-increment: item; } </style> </head> <body> <ol> <li>Element 1 <ol> <li>Sub element 1</li> <li>Sub element 2</li> <li>Sub element 3</li> </ol> </li> <li>Element 2</li> <li>Element 3 <ol> <li>Sub element 1</li> <li>Sub element 2</li> <li>Sub element 3</li> </ol> </li> </ol> </body> </html>