: The script https://www.youtube.com/iframe_api must be loaded asynchronously .
.video-player position: relative; width: 100%; max-width: 800px; overflow: hidden; background: #000; font-family: 'Roboto', sans-serif; youtube html5 video player codepen
const video = document.getElementById('video'); const playBtn = document.getElementById('playPauseBtn'); const progress = document.getElementById('progressBar'); const timeDisplay = document.getElementById('timeDisplay'); const fullscreenBtn = document.getElementById('fullscreenBtn'); : The script https://www