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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-set 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 src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/edibu.js"></script> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/tongji.js"></script></body> </html>