File: stale-while-revalidate.html

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<script>
function wait25ms() {
  return new Promise(resolve => {
    setTimeout(() => {
      resolve();
    }, 25);
  });
}

// runTest() will be called by the browser test.
async function runTest() {
  const url = 'stale-script.js';
  const response = await fetch(url).then(r => r.text());
  const response2 = await fetch(url).then(r => r.text());
  while(true) {
    const revalidation_check = await fetch('stale-script.js');
    if (performance.getEntriesByName(new URL(url, document.location)).length == 2) {
      document.title = "Pass";
      break;
    }
    await wait25ms();
  }
}
</script>