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HTML

              
                <div class='o-content  o-content__intro'>
  <div class="o-content__intro--container">
    <div class="c-word  c-word__fn  c-word--big  c-word--heavy  c-word--brand  c-word--slick">Text</div>
    <div class="c-letters-group">
      <div class="c-word  c-word__ln  c-word--big  c-word--heavy  c-word--brand">Animation</div>
    </div>
    <button href='#' tag="button" class="c-btn  c-btn--bright  c-btn--medium  c-btn__ui-show  u-ch">
      Enter
    </button>
  </div>
</div>

<button class="c-btn  c-btn--bright  c-btn--medium c-btn__restart" style="position:absolute; bottom:10px; right: 10px">Restart</button>
              
            
!

CSS

              
                // the CSS is defined in the settings
              
            
!

JS

              
                // The settings object (do not use any delay values... leads to unexpected & undesireable results)
let SETTINGS = {
  states: {
    introAnimationTextsAlreadyBuilt: false,
    introActive: null
  },
  ui: {
    btns: {
      cBtnUiShow: {
        el: document.querySelector(".c-btn__ui-show"),
        tweenParamsTo: {
          hide: {
            autoAlpha: 0
          },
          show: {
            autoAlpha: 1
          }
        },
        status: "hidden"
      }
    },
    container: {
      cContentIntroContainer: {
        el: document.querySelector(".o-content__intro--container"),
        tweenParamsTo: {
          hide: {
            autoAlpha: 0
          },
          show: {
            autoAlpha: 1
          }
        },
        status: "hidden"
      }
    },
    // This section hold the letters of the words (fn = firstname, ln = lastname) of
    // intro container the to be animated (should be renamed to sth better)
    intro: {
      cWordFn: {
        el: document.querySelector(".c-word__fn"),
        letters: "",
        lettersTotal: null,
        parentElem: "",
        tweenParamsTo: {
          hide: {},
          show: {}
        },
        txt: "",
        status: "shown"
      },
      cWordLn: {
        el: document.querySelector(".c-word__ln"),
        letters: "",
        lettersTotal: null,
        parentElem: "",
        tweenParamsTo: {
          hide: {},
          show: {}
        },
        txt: "",
        status: "shown"
      }
    }
  },
  gsapGlobals: {
    duration: 0.25,
    ease: "easeInOut"
  },
  // Collections have to be defined manually at the moment.
  collectedObjs: {
    intro_allLogoTxtElems: {
      collection: [],
      delay: 0,
      duration: 0.75,
      staggerDelay: 0.05,
      tweenParamsTo: {
        hide: {
          opacity: 0,
          scale: 0.05
        },
        show: {
          opacity: 1,
          scale: 1
        }
      },
      parentContainerCssClass: "o-content__intro--container"
    }
  },
  helpers: {
    activeCollectionDuringSetup: "",
    totalElems: 0
  }
};

/* -----------------------------------------------------------------------------
 * Main animation functions
 * ----------------------------------------------------------------------------*/

// Build Intro Animation.
function introAnim(reverse = false) {
  let tl = new TimelineMax({
    paused: true,
    onComplete: cb_onComplete, // <-- this callback fires BEFORE the nested word animation(s) is/are finished - why?
    onReverseComplete: cb_onReverseComplete
  });
  tl.add("startIntroAnim", 0);

  // These 2 'set' function only make sure, that the 2 DOM elements have their correct settings in the beginning:
  // container = opacity: 1; button = opacity: 0
  tl.set(
    SETTINGS.ui.btns.cBtnUiShow.el,
    SETTINGS.ui.btns.cBtnUiShow.tweenParamsTo.hide,
    "startIntroAnim"
  );
  tl.set(
    SETTINGS.ui.container.cContentIntroContainer.el,
    SETTINGS.ui.container.cContentIntroContainer.tweenParamsTo.show,
    "startIntroAnim"
  );

  // Make the whole container visible... but: we did that in the setting above. All contained elements are set to "opacity: 0" - see
  // prepareText(), where every letter is wrapped in a span with "opacity: 0" assigned.
  // tl.add(toggleVisibilityOfElem(SETTINGS.ui.container.cContentIntroContainer, "show"), "startIntroAnim");
  // animate the words (staggered fade-in)
  tl.add(introAnimTweenWordOpening().play(), "startIntroAnim+=0.5");
  // fade-in the ENTER button: when this tween is finished, this timeline's onComplete is fired - which is NOT good,
  // since the nested staggered tween might still be doing their work...
  tl.add(
    toggleVisibilityOfElem(SETTINGS.ui.btns.cBtnUiShow, "show", 1),
    "-=0.25"
  ); // <-- from the end of the timeline

  if (!reverse) {
    tl.play().timeScale(1);
  } else {
    tl.reverse(0).timeScale(2.5);
  }

  // Do I need a return statement here?
  // What, if I want to cancel the aniamtion from somewhere else?
  return tl;
}

// Staggered nested tweens. The problem here is, that the
// onComplete callback is fired AFTER the main timeline's one.
function introAnimTweenWordOpening() {
  let tl = new TimelineMax({
    paused: true,
    // Here is the TimelineMax's acllback
    onComplete: function() {
      console.log(
        ">>> Finished introAnimTweenWordOpening. Should fire BEFORE the parent's onComplete callback! But does not do so! Why?"
      );
    }
  });

  tl.staggerFromTo(
    SETTINGS.collectedObjs.intro_allLogoTxtElems.collection,
    SETTINGS.collectedObjs.intro_allLogoTxtElems.duration,
    SETTINGS.collectedObjs.intro_allLogoTxtElems.tweenParamsTo.hide,
    SETTINGS.collectedObjs.intro_allLogoTxtElems.tweenParamsTo.show,
    SETTINGS.collectedObjs.intro_allLogoTxtElems.staggerDelay,
    0,
    cb_finishedTweeningIntroText
  );

  // tl.play();
  return tl;
}

function toggleVisibilityOfElem(elem, visibility, delay = 0) {
  let toParams;

  if (visibility === "hide" || visibility === "hidden") {
    toParams = elem.tweenParamsTo.hide;
  } else {
    toParams = elem.tweenParamsTo.show;
  }
  toParams.delay = delay;

  // Set state of element to intro or visible/show or hidden
  elem.status = visibility;

  // TODO: use a global SETTINGS value instead of 0.25
  return new TweenMax.to(elem.el, SETTINGS.gsapGlobals.duration, toParams);
}

/* -----------------------------------------------------------------------------
 * Callback functions
 * ----------------------------------------------------------------------------*/

let cb_onComplete = function() {
  console.log("> CB onComplete; if intro, set 'states.introActive=true'");
};

let cb_onReverseComplete = function() {
  console.log("> CB onReverseComplete");
};

let cb_finishedTweeningIntroText = function() {
  console.log("> CB Finished tweening nested staggered intro text anim.");
};

/* -----------------------------------------------------------------------------
 * The function that start the animation
 * ----------------------------------------------------------------------------*/

function init() {
  // Prepare the text, if required:
  if (!SETTINGS.states.introAnimationTextsAlreadyBuilt) {
    prepareIntroTexts();
  }

  if (SETTINGS.states.introAnimationTextsAlreadyBuilt) {
    introAnim();
  } else {
    console.warn("\n> The text of the intro is not prepared to be animated.");
  }
}

// "removeIntro" called: The intro animation should be played in reverse now and fire an event, when complete.
// But it does not. Instead, the button fades out and then, along with the letters\' aniamtion, in again. Why?
function removeIntro() {
  introAnim(true); // "true means": reverse=true, does not work!
}

/* -----------------------------------------------------------------------------
 * Add eventListener to buttons
 * ----------------------------------------------------------------------------*/

SETTINGS.ui.btns.cBtnUiShow.el.addEventListener("click", removeIntro);

// Restart Button (only for Demo purposes, therefore not added to SETTINGS)
let restartBtn = document.querySelector(".c-btn__restart");
restartBtn.addEventListener("click", init);

/* -----------------------------------------------------------------------------
 * Call the initialize function to start the animation
 * ----------------------------------------------------------------------------*/

init();

/* -----------------------------------------------------------------------------
 * HINT:
 * Below this point are functions that are needed for functionality, but they
 * are irrelevant for the problem of this pen.
 * ----------------------------------------------------------------------------*/

/* -----------------------------------------------------------------------------
 * Prepare text:
 * Make each letter of a word animateable by wrapping it into a span.
 *
 * - Search for a block with a specific class
 * - get innterText
 * - wrap each letter in a span
 * - delete the "old" innerText and assign new content (the span-wrapped word)
 *   and assign each letter a style of opacity=0 
 *
 * Prepare all the intro-related texts. Don't leave any SETTINGS.ui.intro elements out -> will cause error!!!
 * Last param: do NOT add a dot / hash in front of the css selector!!!
 * Only build (that is: collect and save them to the settings object) the intro text, when necessary:
 * ----------------------------------------------------------------------------*/
function prepareIntroTexts() {
  // Get the texts of the intro container:

  // First name
  _getDOMContent(
    SETTINGS.ui.intro.cWordFn.el,
    SETTINGS.ui.intro.cWordFn,
    SETTINGS.collectedObjs.intro_allLogoTxtElems.parentContainerCssClass,
    "intro_allLogoTxtElems", // must be predefined in SETTINGS
    "cWordFn"
  );

  // Last name
  _getDOMContent(
    SETTINGS.ui.intro.cWordLn.el,
    SETTINGS.ui.intro.cWordLn,
    SETTINGS.collectedObjs.intro_allLogoTxtElems.parentContainerCssClass,
    "intro_allLogoTxtElems",
    "cWordLn"
  );

  // Now delete the original text content and re-assign it using the 'thisNode' string from
  // SETTINGS.ui[thisNode]. The parameter delivers the subNode of the SETTINGS
  // object, whose content shall be retrieved
  _swapTexts(SETTINGS.ui.intro);

  // Let the settings know that the intro texts are now built
  SETTINGS.states.introAnimationTextsAlreadyBuilt = true;
}

// Get Text from DOM element and wrap each letter in a span
function _getDOMContent(
  node,
  localSettings,
  parentContainerCssClass,
  collection,
  settingsUiElem
) {
  // console.log(' ')
  // console.log('_getDOMContent:')
  // console.log('node =', node);
  // console.log('localSettings =>', localSettings)
  // console.log('parentContainerCssClass =>', parentContainerCssClass)
  // console.log('node.textContent.trim() =', node.textContent.trim());
  // console.log('collection =', collection)

  let letterArr = [], // save wrapped letters to this array
    nodeTxt = "",
    nodeLen = 0;

  // Some node do not have textContent, so check here!
  if (typeof node.textContent === "string" || typeof node.textContent === "") {
    nodeTxt = node.textContent.trim();
    nodeLen = nodeTxt.length;
  }

  // To setup a new collection, reset the counter
  // Beware: there can be more than just one textNode from a collection!
  // However, this is a bad solution. Better to check, if the text is already
  // there or not, or if the whole object needs to be rebuild.
  if (collection !== SETTINGS.helpers.activeCollectionDuringSetup) {
    SETTINGS.helpers.totalElems = 0;
  }

  // Set the current collection (a DOM element / CSS class of which the texts are children)
  // Must be pre-defined in the Settings object!
  SETTINGS.helpers.activeCollectionDuringSetup = collection;

  // If the node has letters...
  if (nodeLen > 0) {
    // ... loop over all letters and wrap them in a span element
    for (let i = 0; i < nodeLen; i++) {
      // Since we want to count ALL DOM elements that shall be animated in one stagger animation,
      // we need a variable, that counts over ALL of the elements, not just within a group / word.
      // Otherwise the CSS class numbering will be false.
      let newElem = document.createElement("span");
      let newTxtNode = document.createTextNode(nodeTxt[i]);

      newElem.appendChild(newTxtNode);
      newElem.classList.add(
        "c-letter",
        "c-letter-" + ++SETTINGS.helpers.totalElems,
        "c-child-letter-of--" + parentContainerCssClass,
        "c-child-letter-" + (i + 1)
      );

      // Special coloring for special character(s)
      if (nodeTxt[i] === "&") {
        newElem.classList.add("u-color-primary-light");
      }

      letterArr.push(newElem);

      // Save elements to collectedObjs, except empty spaces, which don't need to be animated
      // (would make the animation uneven)
      if (nodeTxt[i] !== " ") {
        SETTINGS.collectedObjs[collection].collection.push(newElem);
      }
    }
  }

  // Assign the wrapped letters to the SETTINGS object of the element
  localSettings.letters = letterArr;
  localSettings.lettersTotal = nodeLen;
  localSettings.parentElem = node;
  localSettings.txt = nodeTxt;
}

// Replace original text with 'spanned' version; depends on _getDOMContent
function _swapTexts(settingsSubNode) {
  for (let i in settingsSubNode) {
    let el = settingsSubNode[i];

    // Only proceed, if a special property is given in the SETTINGS object tree (e.g. 'el';
    // 'divider' for example does not have such an 'el' property, but all text nodes do)
    if (el.hasOwnProperty("el")) {
      // Clear out the original text in the DOM element
      el.parentElem.innerText = "";

      // Now append the text again, but with its new wrappings
      for (i in el.letters) {
        el.parentElem.appendChild(el.letters[i]);
        el.letters[i].style.opacity = 0;
      }
    }
  }
}

// ---------------------------------------------------------------------------------------------------------
//
// Here ist stuff that shold be done with "reverse", which is currently not working...
//
// Dissolve Intro Animation
// TODO: GSAP has a reverse function. Use that on the introAnim instead of creating anew function
//       -> Does not work at the moment
function introAnimReverse() {
  console.log(" ");
  console.log("---> introAnimReverse called");

  this.$store.commit("toggleUIState", true, "visible");
  //  this.toggleUIState(true, 'visible')

  let tl = new TimelineMax({
    paused: true
  });

  tl.add("startIntroAnimReverse", 0);

  //tl.addCallback(this.toggleUIState, 0, [true, 'visible'])

  tl.add(
    this.toggleVisibilityOfElem(
      SETTINGS.ui.container.cContentIntroContainer,
      "hide"
    ),
    "startIntroAnimReverse"
  );
  tl.add(this.introAnimTweenWordClosing(true), "startIntroAnimReverse+=0.15");
  tl.add(this.introAnimTweenLineIn(true), "startIntroAnimReverse+=0.5");
  tl.add(
    this.toggleVisibilityOfElem(SETTINGS.ui.btns.cBtnUiShow, "hidden"),
    "startIntroAnim=+0.75"
  );

  tl.play();
  return tl;
}

// ...used in the introAnimReverse function...
function introAnimTweenWordClosing() {
  // console.log(' ')
  // console.log('---> tween word reverse called');

  let tl = new TimelineMax({
    paused: true
  });

  // Use negative stagger Delay value to make GSAP read the array from behind
  tl.staggerFromTo(
    SETTINGS.collectedObjs.intro_allLogoTxtElems.collection,
    SETTINGS.collectedObjs.intro_allLogoTxtElems.duration,
    SETTINGS.collectedObjs.intro_allLogoTxtElems.tweenParamsTo.show,
    SETTINGS.collectedObjs.intro_allLogoTxtElems.tweenParamsTo.hide,
    -SETTINGS.collectedObjs.intro_allLogoTxtElems.staggerDelay,
    0,
    this.finishedTweeningIntroTextReverse
  );
  tl.timeScale(2.5);
  tl.play();
  return tl;
}

              
            
!
999px

Console