Youtube feature of repeat

index.js

(function () {
  'use strict';

  let currentVideo = null;

  function setupRepeat(video) {
    if (!video || video === currentVideo) return;

    currentVideo = video;

    console.log('[YT Replay] Repeat enabled');

    // Native loop (most reliable)
    video.loop = true;

    // Fallback in case loop is disabled by YouTube
    video.removeEventListener('ended', onEnded);
    video.addEventListener('ended', onEnded);
  }

  function onEnded() {
    console.log('[YT Replay] Video ended, restarting');
    this.currentTime = 0;
    this.play().catch(() => {
      console.warn('[YT Replay] Autoplay blocked, waiting for user interaction');
    });
  }

  function findVideo() {
    const video = document.querySelector('video.html5-main-video');
    if (video) setupRepeat(video);
  }

  // Observe DOM changes (YouTube is an SPA)
  const observer = new MutationObserver(findVideo);
  observer.observe(document.documentElement, {
    childList: true,
    subtree: true
  });

  // Initial attempt
  findVideo();
})();