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HTML 

              
                <!--------- Osmo [https://osmo.supply/] --------->
<section class="cloneable">
  <div class="text-demo-wrap">
    <h1 data-split="heading" class="text-demo-h">We’re using GSAP’s SplitText to break this content into lines, words, and individual characters. Experiment with staggered tweens, custom ease functions, and dynamic transforms to bring your headlines to life.</h1>
    <div class="text-demo-buttons">
      <button data-split="button" data-split-type="lines" class="text-demo-button"><span>Lines</span></button>
      <button data-split="button" data-split-type="words" class="text-demo-button"><span>Words</span></button>
      <button data-split="button" data-split-type="letters" class="text-demo-button"><span>Letters</span></button>
    </div>
  </div>
</section>
<div class="osmo-credits">
  <p class="osmo-credits__p">Resource by <a target="_blank" href="https://www.osmo.supply?utm_source=codepen&utm_medium=pen&utm_campaign=masked-text-reveal" class="osmo-credits__p-a">Osmo</a>
  </p>
</div>
<script src="https://cdn.jsdelivr.net/npm/gsap@3.13.0/dist/gsap.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/gsap@3.13.0/dist/SplitText.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/gsap@3.13.0/dist/CustomEase.min.js"></script>
!

CSS 

              
                /* ------- Osmo [https://osmo.supply/] ------- */
/* Osmo UI: https://slater.app/10324/23333.css */

body {
  background-color: #d8e1ed;
  font-family: PP Neue Montreal, Arial, sans-serif;
  color: #340824;
  font-size: 1vw;
  margin: 0;
  padding: 0;
  overscroll-behavior: none;
  min-height: 100%;
  cursor: url("https://cdn.prod.website-files.com/6708f85ff3d3cba6aff436fb/671251b239d7aeb290a31ac5_cursor-default%402x.svg")
      2 0,
    auto;
}

a,
button {
  cursor: url("https://cdn.prod.website-files.com/6708f85ff3d3cba6aff436fb/671251b212e6b71494aa67ff_cursor-pointer%402x.svg")
      12 0,
    pointer;
}

.cloneable {
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  display: flex;
}

.text-demo-wrap {
  grid-column-gap: 4.5em;
  grid-row-gap: 4.5em;
  flex-flow: column;
  justify-content: flex-start;
  align-items: center;
  width: 100%;
  max-width: 80em;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25em;
  padding-right: 1.25em;
  display: flex;
}

.text-demo-h {
  text-align: center;
  margin-top: 0;
  margin-bottom: 0;
  font-size: 3.75vw;
  font-weight: 500;
  line-height: 1.15;
}

.text-demo-buttons {
  grid-column-gap: 1.25em;
  grid-row-gap: 1.25em;
  justify-content: center;
  align-items: center;
  display: flex;
}

.text-demo-button {
  background-color: #fff;
  border-radius: 100em;
  padding: .625em 1.25em;
  font-size: 2em;
  line-height: 1;
  transition: color .15s, background-color .15s;
  border: 0;
  outline: 0;
  box-shadhow: 0;
}

.text-demo-button:hover {
  color: #fff;
  background-color: #340824;
}

.osmo-credits {
  z-index: 999;
  pointer-events: none;
  flex-flow: column;
  justify-content: center;
  align-items: center;
  width: 100%;
  height: 4em;
  padding: 1em;
  display: flex;
  position: fixed;
  bottom: 0;
  left: 0;
  font-size: 1vw;
}

.osmo-credits__p {
  pointer-events: auto;
  color: rgba(19, 19, 19, 0.5);
  text-align: center;
  margin: 0;
  font-family: PP Neue Montreal, Arial, sans-serif;
  font-size: 1.125em;
  font-weight: 500;
  line-height: 1.3;
}

.osmo-credits__p-a {
  color: #340824;
}

@font-face {
  font-family: 'PP Neue Montreal';
  src: url('https://cdn.prod.website-files.com/6819ed8312518f61b84824df/6819ed8312518f61b84825ba_PPNeueMontreal-Medium.woff2') format('woff2');
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}
!

JS 

              
                // ------- Osmo [https://osmo.supply/] ------- //

gsap.registerPlugin(SplitText, CustomEase)

CustomEase.create("osmo-ease","0.625, 0.05, 0, 1");

function initMaskedTextReveal() {
  const heading = document.querySelector('[data-split="heading"]');
  const buttons = document.querySelectorAll('[data-split="button"]');

  SplitText.create(heading, {
    type: "lines, words, chars",
    mask: "lines",
    linesClass: "line",
    wordsClass: "word",
    charsClass: "letter"
  });

  let currentTween, currentTargets;
  const config = {
    lines: { duration: 0.8, stagger: 0.08 },
    words: { duration: 0.6, stagger: 0.06 },
    letters: { duration: 0.4, stagger: 0.008 }
  };

  function animate(type) {
    if(currentTween){
      currentTween.kill();
      gsap.set(currentTargets, { yPercent: 0 });
    }
    const { duration, stagger } = config[type] || {};
    const className = type === "lines"
      ? "line"
      : type === "words"
        ? "word"
        : "letter";
    const targets = heading.querySelectorAll(`.${className}`);
    
    currentTargets = targets;
    currentTween = gsap.fromTo(
      targets,
      { yPercent: 110 },
      { yPercent: 0, duration, stagger, ease: "osmo-ease" }
    );
    
  }

  buttons.forEach(btn => {
    btn.addEventListener("click", () => {
      animate(btn.dataset.splitType);
    });
  });
}

// Initialize Masked Text Reveal
document.fonts.ready.then(function () {
  initMaskedTextReveal();
})
!
999px

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