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<!DOCTYPE html> <html> <head> <style> input[type=text] { width: 130px; box-sizing: border-box; border: 2px solid #ccc; border-radius: 4px; font-size: 16px; background-color: white; background-image: url('/i/css/searchicon.png'); background-position: 10px 10px; background-repeat: no-repeat; padding: 12px 20px 12px 40px; transition: width 0.4s ease-in-out; } input[type=text]:focus { width: 100%; } </style> </head> <body> <p>有动画效果的输入字段：</p> <form> <input type="text" name="search" placeholder="Search.."> </form> </body> </html>