gomuyo.js

(() => {
  const submitBtn = document.querySelector('input[type=submit]');
  let startedAt;
  const flash = (ts) => {
    if (!startedAt) startedAt = ts;
    const elapsed = ts - startedAt;
    if (elapsed > 100) {
      const e = new MouseEvent('click', {
        view: window,
        bubbles: true,
        cancelable: true,
      })
      submitBtn.dispatchEvent(e);
      startedAt = undefined;
    }
    window.requestAnimationFrame(flash);
  };
  window.requestAnimationFrame(flash);
})();

https://cho45.stfuawsc.com/String_random.js/demo.html?regexp=%E5%BF%83%E9%85%8D%E3%82%B4%E3%83%A0%E7%94%A8+%5C%28%EF%BC%BE%CF%89%EF%BC%BE%5C%29%E3%83%8B%2B%E3%81%A4+%EF%BE%8B%EF%BE%9E%EF%BE%96%EF%BD%B0%EF%BE%9D#%E5%BF%83%E9%85%8D%E3%82%B4%E3%83%A0%E7%94%A8%20%5C(%EF%BC%BE%CF%89%EF%BC%BE%5C)%E3%83%8B%2B%E3%81%A4%20%EF%BE%8B%EF%BE%9E%EF%BE%96%EF%BD%B0%EF%BE%9D