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<!DOCTYPE html> <html> <head> <title>Title of the document</title> <style> h2::before { counter-increment: section; content: "Book " counter(section) ". "; } </style> </head> <body> <p>Click the "Try it" button to set the counter-reset property:</p> <button onclick="myFunction()">Try it</button> <h2>HTML Tutorials</h2> <h2>JavaScript Tutorials</h2> <h2>CSS Tutorials</h2> <script> function myFunction() { document.body.style.counterReset = "section"; } </script> </body> </html>