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<!DOCTYPE html> <html> <head> <style> img:hover { opacity: 0.5; } </style> </head> <body> <h1>图片透明度</h1> <p>opacity 属性通常与 :hover 选择器一起使用来改变鼠标悬停时的不透明度：</p> <img src="img_forest.jpg" alt="森林" width="170" height="100"> <img src="img_mountains.jpg" alt="山脉" width="170" height="100"> <img src="img_5terre.jpg" alt="Italy" width="170" height="100"> </body> </html>