League\CommonMark\Block\Renderer\HeadingRenderer::render PHP Метод

    public function render(AbstractBlock $block, ElementRendererInterface $htmlRenderer, $inTightList = false)
    {
        if (!$block instanceof Heading) {
            throw new \InvalidArgumentException('Incompatible block type: ' . get_class($block));
        }
        $tag = 'h' . $block->getLevel();
        $attrs = [];
        foreach ($block->getData('attributes', []) as $key => $value) {
            $attrs[$key] = $htmlRenderer->escape($value, true);
        }
        return new HtmlElement($tag, $attrs, $htmlRenderer->renderInlines($block->children()));
    }