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<!DOCTYPE html> <html> <head> <style> body { /* Set "section" to 9 */ counter-set: section 9; } h1 { /* Set "subsection" to 0 */ counter-set: subsection 0; } h1::before { counter-increment: section; content: "Section " counter(section) ": "; } h2::before { counter-increment: subsection; content: counter(section) "." counter(subsection) " "; } </style> </head> <body> <h1>HTML and CSS</h1> <h2>HTML Tutorial</h2> <h2>CSS Tutorial</h2> <h2>Bootstrap Tutorial</h2> <hr> <h1>JavaScript</h1> <h2>JavaScript Tutorial</h2> <h2>jQuery Tutorial</h2> <h2>JSON Tutorial</h2> <hr> <h1>Server Side</h1> <h2>SQL Tutorial</h2> <h2>PHP Tutorial</h2> </body> </html>