Function chain

test/test-suite.js:6584–6591

(leaf, links)

      (assert) => {
        const bs = '<b>'.repeat(96);
        const chain = (leaf, links) => {
          let s = '<div><?marker name="x1"></div>';
          for (let i = 1; i <= links; i++) {
            const next = i < links ? `<?marker name="x${i + 1}">` : leaf;
            s += `<template for="x${i}">${bs}${next}</template>`;
          }
          return s;
        };
        const leaf =
          '<math><mtext><style><img src=x onerror=alert(1)></style></mtext></math>';
        for (const links of [4, 6, 8]) {