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<!DOCTYPE html> <html> <head> <style> div { background-color: #4CAF50; padding: 10px; } div.first { opacity: 0.1; } div.second { opacity: 0.3; } div.third { opacity: 0.6; } </style> </head> <body> <h1>opacity 透明度属性</h1> <p>opacity 属性为元素及其所有子元素的背景添加透明度。 这使得透明元素内的文本难以阅读：</p> <div class="first"><p>opacity 0.1</p></div> <div class="second"><p>opacity 0.3</p></div> <div class="third"><p>opacity 0.6</p></div> <div><p>opacity 1 (default)</p></div> </body> </html>