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CSS :only-child 伪类
trycss_sel_only-child
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<!DOCTYPE html> <html> <head> <style> p:only-child { background-color: red; } li:only-child { color: salmon; } b:only-child { color: green; } </style> </head> <body> <h1>Demo of :only-child</h1> <div> <p>This is a paragraph in a div.</p> </div> <div> <p>This is paragraph 1 in a div.</p> <p>This is paragraph 2 in a div.</p> </div> <p>Here are some <b>bold text</b>.</p> <p>Here are some lists:</p> <ul> <li>First list item</li> </ul> <ol> <li>First list item</li> <li>Second list item</li> <li>Third list item</li> </ol> </body> </html>