;
                svg.style.height = viewerContent.offsetHeight + 'px';
                svg.style.display = 'block';

                viewerContent.style.position = 'absolute';
                viewerContent.style.top = '50px';
                viewerContent.style.left = '0';
                viewerContent.style.right = '0';
                viewerContent.style.bottom = '0';
                viewerContent.style.overflow = 'hidden';

                if (!markdown.startsWith('---\nmarkmap:')) {
                   