Javascript and css animation keep getting out of sync

Question

So basically my CSS animation is supposed to emulate some text being typed, un-typed and finally changed to another word. Normally the CSS keyframe and JavaScript setInterval are in sync but on mobile devices they sometimes get out of sync or if I go to a new tab they de-synchronize.

<center style="display: flex; width:70vw">
     <h1 style="padding-right:20px;">We</h1>
     <h1 id="terminal-text">innovate.</h1>
</center>
<script type="text/javascript">
    var i = 0;
    words = ['architect.','build.','design.','code.','develop.','innovate.'];
    setInterval(function() {
      $("#terminal-text").text(words[i]);
      i++;
      if (i > words.length) {
        i=0;
      }
    },3000);
</script>

#header .banner h1 {
  margin: 1em 0 .5em -10%;
  padding: 0;
  color: white;
  text-align: left;
}
@keyframes terminal {
  0% {max-width:0}
  50% {max-width:100%}
  55% {max-width:100%}
  100% {max-width:0}
}
#header #terminal-text {
  font-weight: bold;
  margin: 1em 0 .5em 0;
  padding: 0;
  animation: terminal 3s infinite;
  overflow: hidden;
  white-space: nowrap;
  border-right: 4px solid white;
  text-align: left;
}

Answer 1

instead of having a setInterval() in javascript you could listen for animation end event. The problem with your approach is that you can not start both "timers" (css/js) at the same time (you could with another approach) but this could solve your issue

var wordIndex = 0;
words = ['architect.','build.','design.','code.','develop.','innovate.'];

var changeWord = function() {
  $("#terminal-text").text(words[wordIndex++]);
};

var element = document.querySelector("#terminal-text");
element.addEventListener("animationiteration", changeWord, false);

// you could also do something special on start event
// replace changeWord with whatever functionality you need
// element.addEventListener("animationstart", changeWord, false);

// animationend will never be triggered in your code at the moment
// but maybe you want to do something with it somewhen
// element.addEventListener("animationend", function() {console.log('animation ended')}, false);

#header .banner h1 {
  margin: 1em 0 .5em -10%;
  padding: 0;
  color: white;
  text-align: left;
}
@keyframes terminal {
  0% {max-width:0}
  50% {max-width:100%}
  55% {max-width:100%}
  100% {max-width:0}
}
#header #terminal-text {
  font-weight: bold;
  margin: 1em 0 .5em 0;
  padding: 0;
  animation: terminal 3s infinite;
  overflow: hidden;
  white-space: nowrap;
  border-right: 4px solid white;
  text-align: left;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="header">
  <center style="display: flex; width:70vw">
    <h1 style="padding-right:20px;">We</h1>
    <h1 id="terminal-text">innovate.</h1>
  </center>
</div>