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<!DOCTYPE html> <html> <head> <style> body { margin: 0; } * { box-sizing: border-box; } input, textarea { width: 100%; } </style> </head> <body> <form action="/action_page.php"> First name:<br> <input type="text" name="firstname" value="Mickey"><br> Last name:<br> <input type="text" name="lastname" value="Mouse"><br> Comments:<br> <textarea name="message" rows="5" cols="30"> </textarea> <br><br> <input type="submit" value="提交"> </form> <p><strong>提示：</strong>尝试从样式元素中删除 box-sizing 属性，看看会发生什么。 请注意，输入、文本区域和提交按钮的宽度将超出屏幕。</p> </body> </html>