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                <div id="someContainer">
  <div id="myStuff">
    <div id="splitMe">
      THIS IS SOME TEXT<br />
      BUT IT ISN'T
    <!-- Other stuff -->


                #someContainer {
  display: none; 


                var myAd = document.querySelector("#myStuff");

// Make sure your stuff is hidden when it does load
TweenLite.set(myAd, {autoAlpha: 0});

function splitIfVisible() {
  if(myAd.offsetWidth > 0) {
    var myText =  new SplitText("#splitMe"); 

    // Show your stuff when ready
    TweenLite.set(myAd, {autoAlpha: 1});
    var tl = new TimelineMax({});
    tl.staggerFrom(myText.words, 1, { opacity: 0, x: 5, ease: Power1.easeOut}, 0.25);
  } else {
    // Check again in 100 ms
    TweenLite.delayedCall(0.1, splitIfVisible);


// This is to simulate the webpage changing the display
// DON'T keep it in your production code
TweenLite.delayedCall(1.2, function() {
  TweenLite.set(("#someContainer"), {display: "block"});