:default CSS pseudo-class
The `:default` pseudo-class matches checkboxes and radio buttons which are checked by default, `<option>`s with the `selected` attribute, and the default submit button (if any) of a form.
Form attribute
Attribute for associating input and submit buttons with a form.
Attributes for form submission
Attributes for form submission that may be specified on submit buttons. The attributes are: `formaction`, `formenctype`, `formmethod`, `formnovalidate`, and `formtarget`
Form validation
Method of setting required fields and field types without requiring JavaScript. This includes preventing forms from being submitted when appropriate, the `checkValidity()` method as well as support for the `:invalid`, `:valid`, and `:required` CSS pseudo-classes.
formdata api: `formdata()` constructor: `submitter` parameter
gpuqueue api: onsubmittedworkdone
gpuqueue api: submit
htmlformelement api: `requestsubmit()`
htmlformelement api: submit
htmlformelement api: `submit` event
submitevent api
submitevent api: `submitevent()` constructor
submitevent api: submitter
vrdisplay api: submitframe
css selector: `:-moz-submit-invalid`
html element: input: `type="submit"`
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