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<!DOCTYPE html> <html> <head> <style> input[type=text] { width: 100px; -webkit-transition: width .35s ease-in-out; transition: width .35s ease-in-out; } input[type=text]:focus { width: 250px; } </style> </head> <body> <h1>width 属性</h1> <p>将输入字段的宽度设置为 100 像素。 但是，当输入字段获得焦点时，将其设置为 250 像素宽：</p> Search: <input type="text" name="search"> </body> </html>