           latex:
              '\\large \\textcolor{blue}{\\vec{x}=\\vec{\\frac34}=\\widehat{x}=\\widehat{x+y}}',
          },
          {
            title: 'Stacks (delimiter atom)',
            latex:
              '\\textcolor{blue}{\\int_0^\\infty\\smallint_0^\\infty\\oint_0^\\infty}',
          },
          {
            title: 'Stacks (genfrac atom)',
            latex:
              '\\textcolor{blue}{\\Large \\frac34=\\frac{3}{x+1}=\\binom34=\\sqrt{2}=\\sqrt[3]{2}}',
          },
          {
     