after-words/script.js

const playerButton = document.querySelector('.player-button'),
    audio = document.querySelector('audio'),
    playIcon = `
        <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="rgb(255 255 255/var(--tw-bg-opacity))">
    <path fill-rule="evenodd" d="M10 18a8 8 0 100-16 8 8 0 000 16zM9.555 7.168A1 1 0 008 8v4a1 1 0 001.555.832l3-2a1 1 0 000-1.664l-3-2z" clip-rule="evenodd" />
  </svg>
      `,
    pauseIcon = `
        <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="rgb(255 255 255/var(--tw-bg-opacity))">
  <path fill-rule="evenodd" d="M18 10a8 8 0 11-16 0 8 8 0 0116 0zM7 8a1 1 0 012 0v4a1 1 0 11-2 0V8zm5-1a1 1 0 00-1 1v4a1 1 0 102 0V8a1 1 0 00-1-1z" clip-rule="evenodd" />
</svg>

`;

function toggleAudio() {
    if (audio.paused) {
        audio.play();
        playerButton.innerHTML = pauseIcon;
    } else {
        audio.pause();
        playerButton.innerHTML = playIcon;
    }
}

playerButton.addEventListener('click', toggleAudio);

function audioEnded() {
    playerButton.innerHTML = playIcon;
}

audio.onended = audioEnded;

const timeline = document.querySelector('.timeline');

function changeTimelinePosition() {
    const percentagePosition = (100 * audio.currentTime) / audio.duration;
    timeline.style.backgroundSize = `${percentagePosition}% 100%`;
    timeline.value = percentagePosition;
}

audio.ontimeupdate = changeTimelinePosition;

function changeSeek() {
    const time = (timeline.value * audio.duration) / 100;
    audio.currentTime = time;
}

timeline.addEventListener('change', changeSeek);