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源代码：
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<!DOCTYPE html> <html> <head> <style> img { opacity:0.4; filter:alpha(opacity=40); /* For IE8 and earlier */ } img:hover { opacity:1.0; filter:alpha(opacity=100); /* For IE8 and earlier */ } </style> </head> <body> <h1>Image Transparency</h1> <img src="/statics/images/course/klematis.jpg" width="150" height="113" alt="klematis"> <img src="/statics/images/course/klematis2.jpg" width="150" height="113" alt="klematis"> <p><b>Note:</b> In IE, a <!DOCTYPE> must be added for the :hover selector to work on other elements than the <a> element.</p> </body> </html>
运行结果
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