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<!DOCTYPE html> <html> <head> <style> body { /* Set "my-sec-counter" to 0 */ counter-reset: my-sec-counter; } h2::before { /* Increment "my-sec-counter" by 1 */ counter-increment: my-sec-counter; content: "Section " counter(my-sec-counter) ". "; } </style> </head> <body> <h2>HTML 教程</h2> <h2>CSS 教程</h2> <h2>JavaScript 教程</h2> <h2>Bootstrap 教程</h2> <h2>SQL 教程</h2> <h2>PHP 教程</h2> </body> </html>