ExampleRenderer.php

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<?php

declare(strict_types=1);

use ILIAS\UI\Implementation\Component\Button\Bulky;
use ILIAS\UI\Implementation\Render\DecoratedRenderer;
use ILIAS\UI\Renderer;

class ExampleRenderer extends DecoratedRenderer
{
    protected function manipulateRendering($component, Renderer $root) : ?string
    {
        // choose the component you want to manipulate by checking the instance
        // as closely as possible. please note there may be custom components in
        // the current chain, which may extend an interface or implementation,
        // and also run into your manipulation.
        if ($component instanceof Bulky) {
            // render the component by passing it to the rendering chain of
            // renderers that come before this renderer.
            $html = $this->renderDefault($component);
            // manipulate the html to your desire and/or replace it entirely.
            $html .= 'my custom additions';
            // finally pass the manipulated HTML to the cain, so other renderers
            // that come after this may manipulate it too.
            return $html;
        }

        // return null to indicate you are not interested in the given component.
        return null;
    }
}