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CSS 参考手册
CSS :nth-of-type() 伪类
trycss_sel_nth-of-type3
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<!DOCTYPE html> <html> <head> <style> p:nth-of-type(3n+0) { background: red; } </style> </head> <body> <h1>Demo of nth-of-type()</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>