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CSS 参考手册
CSS ::before 伪元素
trycss_sel_before_style
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<!DOCTYPE html> <html> <head> <style> p::before { content: "Read this -"; background-color: yellow; color: red; font-weight: bold; } </style> </head> <body> <h1>Demo of ::before</h1> <p>My name is Donald.</p> <p>I live in Duckburg.</p> </body> </html>