html - HTML 表单的默认编码类型是什么？

Question

假设我有一个包含一些输入的表单:

<form action="demo_post_enctype.asp" method="post" >
  First name: <input type="text" name="fname"><br>
  Last name: <input type="text" name="lname"><br>
  <input type="submit" value="Submit">
</form>

如果我提交此表单:浏览器使用哪种编码类型？

是否有明确定义的默认类型？
还是每个浏览器都选择自己的 enctype(当然是在三个允许的类型中)？

Answer 1

The invalid value default for these attributes is the application/x-www-form-urlencoded state. The missing value default for the enctype attribute is also the application/x-www-form-urlencoded state. (There is no missing value default for the formenctype attribute.)

— HTML 5

This attribute specifies the content type used to submit the form to the server (when the value of method is "post"). The default value for this attribute is "application/x-www-form-urlencoded". The value "multipart/form-data" should be used in combination with the INPUT element, type="file".

— HTML 4

This determines the mechanism used to encode the form's contents. It defaults to application/x-www-form-urlencoded.

— HTML 3.2