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<!DOCTYPE html> <html> <head> <style> h1:before { counter-increment: section; content: "Section " counter(section) ". "; } </style> </head> <body> <p>Click the "Try it" button to set the counter-reset property of the BODY element:</p> <button onclick="myFunction()">Try it</button> <h1>HTML Tutorials</h1> <h1>JavaScript Tutorials</h1> <h1>CSS Tutorials</h1> <script> function myFunction() { document.body.style.counterReset = "section"; } </script> </body> </html>