HTMLFormElement : HTMLElement

Forms contain %%HTMLInputElement|HTMLInputElements%% and send
the user input to the server.

See also %%/FormData|FormData%%.

Spec:
https://html.spec.whatwg.org/#htmlformelement

----
instance[index : Number] : Element

Returns the input element at **index** in the form.

<htmlexample>
<form id='form'>
  <input name='text' value='foo'>
  <label> <input type='radio' name='letters'>A</label>
  <label> <input type='radio' name='letters' checked>B</label>
  <label> <input type='radio' name='letters'>C</label>
</form>
<script>
  var form = document.getElementById('form');

  var text = form[0];
  console.log(text.value);

  var b = form[2];
  console.log(b.checked);
</script>
</htmlexample>

----
instance[name : String] : Object

Returns the element in the form with the specified **name**. The returned value
will be of the type

%%/HTMLInputElement|HTMLInputElement%%,
%%/HTMLImageElement|HTMLImageElement%%, or
%%/NodeList|NodeList%%.
NodeList is returned if **name** used on radio input elements.

<htmlexample>
<form id='form'>
  <input name='text' value='foo'>
  <label> <input type='radio' name='letters'>A</label>
  <label> <input type='radio' name='letters'>B</label>
  <label> <input type='radio' name='letters'>C</label>
</form>
<script>
  var form = document.getElementById('form');

  var text = form['text'];
  console.log(text.value);

  var nodeList = form['letters'];
  console.log(nodeList.length);
</script>
</htmlexample>

----
instance.acceptCharset : String


----
instance.action : String


----
instance.autocomplete : String


----
instance.enctype : String


----
instance.encoding : String


----
instance.method : String


----
instance.name : String


----
instance.noValidate : Boolean


----
instance.target : String


----
instance.elements : HTMLFormControlsCollection

ReadOnly:
true

----
instance.length : Number

ReadOnly:
true

----
prototype.submit() : undefined


----
prototype.reset() : undefined


----
prototype.checkValidity() : Boolean

----
event.submit : listener() : Boolean

Called before the form is submitted to the server.  Return **false** to
stop the form from being submitted.