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<!DOCTYPE html> <html> <head> <style> /* Default CSS Values */ form { display: block; margin-top: 0em; } </style> </head> <body> <p>一个 form 元素显示如下：</p> <form action="demo_form.asp"> First name: <input type="text" name="FirstName" value="Mickey"><br> Last name: <input type="text" name="LastName" value="Mouse"><br> <input type="submit" value="提交"> </form> <p>一个自定义的表单元素（更改了 margin-top）：</p> <form action="demo_form.asp" style="margin-top:50px;"> First name: <input type="text" name="FirstName" value="Mickey"><br> Last name: <input type="text" name="LastName" value="Mouse"><br> <input type="submit" value="提交"> </form> </body> </html>