docs: async function render(node) {
              let renderedValue;
              const isMath = node.type === 'math';
  
              try {
                  renderedValue = katex.renderToString(node.math, {
                      displayMode: isMath
                  });
              }
              catch (err) {
                  const response = await fetch('//tex.s2cms.ru/svg/' + encodeURIComponent(node.math) );
                  renderedValue = await response.text();
              }
  
              const childAst = parseMathHtml(renderedValue).children[0];
              node.data = node.data || {};
              node.data.hChildren = [childAst];
          }