$form->setAction( $this->getPageTitle( 'delete' )->getLocalURL() );
$form->tagAction = 'delete'; // custom property on HTMLForm object
$form->setSubmitCallback( [ $this, 'processTagForm' ] );
$form->setAction( $this->getPageTitle( 'delete' )->getLocalURL() );
$form->tagAction = 'delete'; // custom property on HTMLForm object
$form->setSubmitCallback( [ $this, 'processTagForm' ] );