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Showing content from https://developer.mozilla.org/en-US/docs/Glossary/Submit_button below:

Submit button - Glossary | MDN

Submit button

A submit button is an element in HTML that can be used to submit a <form>. The native submit button elements are:

<button> (its default type is "submit")
<input type="submit">
<input type="image">

In addition to submitting a form, a submit button can affect the form's behavior and what data is sent.

Overriding the form's behavior

Submit buttons can override the form's submission behavior through various attributes:

formaction: Override the action attribute of the form.
formenctype: Override the enctype attribute of the form.
formmethod: Override the method attribute of the form.
formnovalidate: Override the novalidate attribute of the form.
formtarget: Override the target attribute of the form.

Form data entries

If the submit button is a <button> or <input type="submit"> and has a name attribute, the form data set will include an entry for its name and value.

If the submit button is an <input type="image">, the form data set will include entries for the X and Y coordinates that the user clicked on (e.g., x=100&y=200 or buttonName.x=123&buttonName.y=234).