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JavaScript preprocessors can help make authoring JavaScript easier and more convenient. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.

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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

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HTML

            
              <div class="video-wrapper">
  <video class="video-js" preload="auto" muted playsinline></video>
  <div class="video-inner">
    <span></span>
    <ul>
      <li>
        <div class="inner">          
          <h2>1-3 seconds</h2>
          <p>テキストをひょうじ</p>
        </div>
      </li>
      <li>
        <div class="inner">          
          <h2>5-8 seconds</h2>
          <p>5びょうめから8びょうめ</p>
        </div>
      </li>
      <li>
        <div class="inner">          
          <h2>9-11 seconds</h2>
          <p>ぜんたいにフィルターをかける</p>
        </div>
      </li>
      <li>
        <div class="inner">          
          <h2>12-16 seconds</h2>
          <div class="content">
            <div class="balloon_wrapper">
              <p class="balloon3">がぞうと<br>テキストを<br>かさねてみる</p>
            </div>
            <img src="https://homemadegarbage.com/assets/images/icon-dolphin.png" alt="">
          </div>
        </div>
      </li>
      <li>
        <div class="inner">          
          <h2>17- seconds</h2>
          <p>END...フェードアウト</p>
        </div>
      </li>
      <li><!-- フェードアウト用要素--></li>
    </ul>
  </div>
</div>
!

CSS

            
              body {
  margin: 0;
}

/* ビデオ */
.video-wrapper {
  width: 100%;
  position: relative;
  padding-top: 56.25%;
  background: none;
}
#vjs_video_3 {
  display: block;
  position: absolute;
  top: 0;
  left: 0;
  z-index: 1;
  width: 100%;
  height: 100%;
  background: none;
}

/* 動画の上に表示する要素のスタイル */
.video-inner {
  position: absolute;
  top: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  color: white;
  text-align: center;
}
.video-inner li {
  font-size: 2rem;
  opacity: 0;
  position: absolute;
  top: 0;
  Left: 0;
  bottom: 0;
  width: 100%;
}
.video-inner li .inner {
  position: relative;
}
.video-inner li:nth-child(3) {
  background: rgba(0,0,0,.5)
}

h2 {
  font-family: 'Cabin Sketch', cursive;
}
p,span {
  font-family: "Nico Moji";
}
img {
  position: absolute;
  left: 50%;
}
span {
  position: absolute;
  right: 1rem;
  top: 1rem;
  z-index: 2;
}
.content {
  width: 90%;
  height: 90%;
  text-align: center;
  margin: auto;
  position: relative;
}
/* 吹き出し */
.balloon_wrapper {
  position: absolute;
  left: 10%;
  margin-top: -1rem;
}
.balloon3{
  position: relative;
  padding: 8%;
  width: 120px;
  height: 80px;
  padding: 1rem;
  border-radius: 30px;
  text-align: center;
  color: #ffffff;
  letter-spacing: 0.2em;
  font-size: 14px;
  background-color: #6baad4;
  text-align: center;
  box-sizing: border-box;
}
.balloon3::before{
  content: '';
  position: absolute;
  display: block;
  width: 0;
  height: 0;
  right: 2px;
  bottom: 2px;
  border-right: 20px solid #6baad4;
  border-top: 10px solid transparent;
  border-bottom: 10px solid transparent;
  transform: rotate(-45deg);
}
/* フェードアウト */
li:nth-child(6) {
  background: #000;
}
 

@media only screen and (min-width: 750px) {
  h2 {
    font-size: 5rem;
  }
  .balloon_wrapper {
    left: 25%;
  }
  img {
    left: 0;
    right: 0;
    margin: auto;
  }
  .content {
    width: 60%;
  }
}
!

JS

            
              // videojs
var player = videojs(document.querySelector('video'), {
  autoplay: true,
	preload: true,
  loop: true
});
player.ready(function () {
  player.src({
	src: 'http://homemadegarbage.com/demo/assets/mov.mp4'
	});
});

// 表示切り替え
var speed = 1000;
var showElement = function(e,start,end) {
  showElement.time == start && $(e).animate({ opacity: 1 }, speed);
  end && showElement.time == end && $(e).animate({ opacity: 0 }, speed);  
};

var prevTime = 0;
player.on('timeupdate', function () {
  $('span').text(player.currentTime());
  var currentTime = Math.floor(player.currentTime());
  if (currentTime != prevTime) {
    currentTime == 0 && $('.video-inner li').css('opacity','0');
    showElement.time = currentTime;
    showElement('.video-inner li:nth-child(1)',1,3);
    showElement('.video-inner li:nth-child(2)',5,8);
    showElement('.video-inner li:nth-child(3)',9,11);
    showElement('.video-inner li:nth-child(4)',12,16);
    showElement('.video-inner li:nth-child(5)',17);
    showElement('.video-inner li:nth-child(6)',19);
  }
  prevTime = currentTime;
});
!
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