Script minified in https://github.com/thinog/bad-web-vitals-workshop to force people to defer the execution of non-critical scripts.

not-so-important-third-party-script.js

async function run() {
  const delayMs = 1000;
  const startedAt = Date.now();

  console.log("[Workshop] Starting a third-party script not so important 😃");

  if (document.currentScript.defer) {
    await new Promise((resolve) => setTimeout(resolve, delayMs));
  } else {
    const waitUntil = Date.now() + delayMs;
    while (Date.now() < waitUntil) continue;
  }

  const finishedAt = Date.now() - startedAt;

  console.log(
    `[Workshop] The not-so-important third-party script has been executed! It only took ${finishedAt} ms 🙏`,
  );
}

run();