The HTMLFormElement.submit() method submits the form. This method does something similar to activating a submit button of the form.
The form's onsubmit event handler (for example, onsubmit="return false;") will not be triggered when invoking this method from Gecko-based applications. In general, it is not guaranteed to be invoked by HTML user agents.
Reference: https://lists.w3.org/Archives/Public/www-dom/2012JanMar/0011.html
If a form control (such as a submit button) has a name or id of submit it will mask the form's submit method.
Syntax
HTMLFormElement.submit()
Example
document.forms["myform"].submit()