Phalcon How to change template extension from phtml on html

I will want to change template extension from .phtml to .html, but my attempts has failed.

$this->view->registerEngines([
    'html'
]);

You forgot the . before html file extension. Try like this:

// View
$di->setShared('view', function() use ($di) {
    $view = new \Phalcon\Mvc\View();
    $view->registerEngines([
        '.yourextension' => function($view, $di) {
            ...
            ...
            ...
        }
    ]);
    return $view;
});

Just tested with .qq extension and it worked as intended.