https://api.drupal.org/api/drupal/core%21modules%21system%21tests%21modules%21ajax_forms_test%21src%21Form%21AjaxFormsTestAjaxElementsForm.php/function/AjaxFormsTestAjaxElementsForm%3A%3AsubmitForm/8.9.x
function AjaxFormsTestAjaxElementsForm::submitForm | Drupal API
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