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HTML 

              
                <link href="https://fonts.googleapis.com/css?family=Open+Sans:300&display=swap" rel="stylesheet">

<section class="home_intro_videos loading" >
  
  <div class="load-label">Loading...</div>
  
<video id="intro" class="intro hidden" muted  playsinline >
  <source src="https://useplink.com/assets/images/frontpage/intro.webm" type="video/webm">
</video>

<video id="intro-loop" class="intro-loop hidden" muted playsinline  loop style="opacity: 1; z-index: 2;">
  <source src="https://useplink.com/assets/images/frontpage/loop.webm" type="video/webm">
</video>
  
  <div class="banner-text">
  <h1><span>Send</span> <span>payment</span> <span>requests,</span><br>
    <span>get</span> <span>paid</span> <span>fast!</span>
    </h1>
  </div>
  
  <button id="replayBtn">Replay</button>
</section>

<article>
<h1>Video that seamlessly flows into another video.</h1>
<p>There are 2 videos here.  One that plays at the beginning, and another that loops seamlessly after the first one finishes. </p>
<p>Furthermore, the text <q>Send payment request, get paid fast</q> is not part of the video file itself, but rather, an H1 tag (and span tags) that are synced with the video via javascript.</p>
<p>Finally, I made a loading screen that is in effect until the first video has loaded enough to play through.</p>
  <h2>But, Should We Use A Loading Screen?</h2>
  <p>I have mixed feelings about the loading screens. They make websites feel slower, and force people to wait when they could otherwise be exploring the page while it finishes loading.  It would be nice if the loading screen presented something useful. Perhaps as long at the video is small enough, we can deal with a short loading screen.
  
  <h2>Credit to mollie.com</h2>
  <p><strong>Disclaimer:</strong> Full credit for the video goes to the team behind <strong><a href="https://useplink.com/en/">UsePlink.com</a></strong>.  I simply recreated it for educational purposes. </p>
  
</article>
!

CSS 

              
                html, body {margin:0; padding:0;  font-family: 'Open Sans', sans-serif; font-weight:300;
}

.home_intro_videos {
  position:relative;
  padding-bottom:56.25%;
  transition: .25s ease-out;
  background:#00418f;
}
.home_intro_videos.loading {
  opacity:.85;
}
.load-label {display:none;}
.loading .load-label {
  position:absolute;
  color:white;
  z-index:9;
  top:25%;
  left:25%;
  bottom:25%;
  right:25%;
  display:flex;
  justify-content:center;
  align-items:center;
  font-size:6vw;
}

.home_intro_videos video {
  max-width:100%;
  position:absolute;
  vertical-align:top;
}
.home_intro_videos video.intro {
  z-index:2;
}
.home_intro_videos video.hidden {
display:none;
}

.home_intro_videos .banner-text {
  position:absolute;
  top:4%;
  left:5%;
  width:55%;
  color:white;
  z-index:5;
  font-size:3.6vw;
  line-height:1.05;
}
.home_intro_videos .banner-text h1 { font-weight:300; }
.home_intro_videos .banner-text h1 span {
  display:inline-block;
  transform:scale(0.2);
  opacity:0;
  transition:.1s ease-out;
  text-shadow:0 0 6px rgba(0,20,80,.75);
  
}
.home_intro_videos .banner-text h1 span.active {
  opacity:1;
  transform:scale(1);
}
#replayBtn {
  position:absolute;
  bottom:0; right:0;
  z-index:6;
  background:rgba(0,10,40,.5);
  color:white;
  padding:12px;
  line-height:1;
  border:solid 1px #357;
  cursor:pointer;
}



/*--- article ----*/
article {
  padding:0 16px;
  max-width:640px;
  margin:auto;
}
q {font-style:italic; font-weight:bold;}
!

JS 

              
                var video1 = document.querySelector('#intro');
var video2 = document.querySelector('#intro-loop');
var videoWrapper = document.querySelector('.home_intro_videos');

var $wSend = document.querySelector('.home_intro_videos h1 span:first-child');
var $wPayment = document.querySelector('.home_intro_videos h1 span:nth-child(2)');
var $wRequests = document.querySelector('.home_intro_videos h1 span:nth-child(3)');
var $wGet = document.querySelector('.home_intro_videos h1 span:nth-of-type(4)');
var $wPaid = document.querySelector('.home_intro_videos h1 span:nth-of-type(5)');
var $wFast = document.querySelector('.home_intro_videos h1 span:nth-of-type(6)');

var $replyBtn = document.querySelector('#replayBtn');

video1.oncanplaythrough = function() {
    videoWrapper.classList.remove('loading');
    video1.classList.remove('hidden');
    video1.play();
};

video1.addEventListener('timeupdate', (e) => { 
    if (e.target.currentTime >=  0.25)  {
        $wSend.classList.add('active');
    }
    if (e.target.currentTime >=  0.5)  {
       $wPayment.classList.add('active');
    }
     if (e.target.currentTime >=  0.75)  {
       $wRequests.classList.add('active');
    }
    if (e.target.currentTime >=  2.5)  {
      $wGet.classList.add('active');
    }
    if (e.target.currentTime >=  2.75)  {
      $wPaid.classList.add('active');
    }
    if (e.target.currentTime >=  3)  {
      $wFast.classList.add('active');
    }
});
video1.onended = function(e) {
      video1.pause();
      video2.classList.remove('hidden');
      video2.play();
};
$replyBtn.addEventListener('click', function (event) {
    video1.pause();
    video1.currentTime = '0';
    video1.play();
    video2.classList.add('hidden');
    video2.pause();
    video2.currentTime = '0';
});
!
999px

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