Web forms are
defined and used by the "form" tag. The
"form" tag is used to create HTML forms for user input.
Forms can contain input elements, such as text fields, check boxes, radio buttons, submit buttons, and so on.
The form can also contain menus, textarea, fieldset, legend and label elements. The
form is used to transmit data to the server. The
most important attribute
action: control the submission path of the
data method: control the submission method of the data (that is, the request method in the first line of the request) , The default get
"Input" it is an empty element
The two most important attributes name and value