formmethod [HTML5]

If the input element is a submit button or image, this attribute specifies the HTTP method that the browser uses to submit the form. Possible values are:
  post: The data from the form is included in the body of the form and is sent to the server.
  get: The data from the form are appended to the form attribute URI, with a '?' as a separator, and the resulting URI is sent to the server. Use this method when the form has no side-effects and contains only ASCII characters.
  
If specified, this attribute overrides the method attribute of the element's form owner.