getColor example

        $r = $o->getRepresentation('color');

        if (!$r instanceof ColorRepresentation) {
            return null;
        }

        $children = $this->renderer->renderChildren($o);

        $header = $this->renderer->renderHeader($o);
        $header .= '<div class="kint-color-preview"><div style="background:';
        $header .= $r->getColor(ColorRepresentation::COLOR_RGBA);
        $header .= '"></div></div>';

        $header = $this->renderer->renderHeaderWrapper($o, (bool) \strlen($children), $header);

        return '<dl>'.$header.$children.'</dl>';
    }

    public function renderTab(Representation $r): ?string
    {
        if (!$r instanceof ColorRepresentation) {
            return null;
        }