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CSS 参考手册
CSS counter-set 属性
trycss_counter-set4
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<!DOCTYPE html> <html> <head> <style> body { /* Set "my-counter" to 9 */ counter-set: my-counter 9; } h2::before { /* Increment "my-counter" by 1 */ counter-increment: my-counter; content: counter(my-counter, upper-roman) ". "; } </style> </head> <body> <h2>HTML Tutorial</h2> <h2>CSS Tutorial</h2> <h2>JavaScript Tutorial</h2> <h2>Bootstrap Tutorial</h2> <h2>SQL Tutorial</h2> <h2>PHP Tutorial</h2> </body> </html>