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CSS 参考手册
CSS :nth-child() 伪类
trycss_sel_nth-child3
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<!DOCTYPE html> <html> <head> <style> p:nth-child(3n+1) { background-color: red; } </style> </head> <body> <h1>Demo of :nth-child</h1> <p>The first paragraph.</p> <p>The second paragraph.</p> <p>The third paragraph.</p> <p>The fourth paragraph.</p> <p>The fifth paragraph.</p> <p>The sixth paragraph.</p> <p>The seventh paragraph.</p> <p>The eight paragraph.</p> <p>The ninth paragraph.</p> </body> </html>