The HTMLFormElement.action property represents the action of the <form> element. 
The action of a form is the program that is executed on the server when the form is submitted. This property can be retrieved or set.
 The HTMLFormElement.action property represents the action of the <form> element. 
The action of a form is the program that is executed on the server when the form is submitted. This property can be retrieved or set.
A string.
js
form.action = "/cgi-bin/publish";
| Specification | 
|---|
| HTML Standard  # dom-fs-action  | 
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
action | 
1 | 12 | 1 | 5.5 | ≤12.1 | 3 | 4.4 | 18 | 4 | ≤12.1 | 1 | 1.0 | 
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    https://developer.mozilla.org/en-US/docs/Web/API/HTMLFormElement/action