modal.php

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<?php
function modal()
{
    global $DIC;
    $factory = $DIC->ui()->factory();
    $renderer = $DIC->ui()->renderer();

    $modal = $factory->modal()->roundtrip(
        'Close Button Demo',
        $factory->legacy('See the Close Button in the top right corner.')
    );
    $button1 = $factory->button()->standard('Show Close Button Demo', '#')
        ->withOnClick($modal->getShowSignal());

    return $renderer->render([$button1, $modal]);
}