What attribute is missing if a developer’s HTML5 form is not processing data despite having the method attribute?

The action attribute of the

element is essential for processing data submitted through an HTML5 form. This attribute specifies the URL where the form data should be sent when the user submits the form. Without this attribute, even if the method attribute is correctly defined (indicating how to send the data, either "GET" or "POST"), the form does not know where to send the data, rendering the form non-functional in terms of processing.

When a form is submitted, it relies both on the method and action attributes to fulfill the intended submission process. The method attribute tells the browser how to send the data, but without the action, there is no destination for the data to go, which is why the form won't process the input as expected.

In contrast, the other attributes listed, like the Post/Redirect or Redirect attribute, do not pertain to the initiation of data submission but rather manage the response workflow after data submission. The type attribute of the element is relevant to the kind of data being collected (like text, password, or email) but does not impact the submission directly. Similarly, the target attribute determines where to display the response from the action but does not affect the submission destination itself.