3D Extrude Reveal

<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/bundles/anime.umd.min.js"></script>
<script>
  (function () {
    // 3D Extrude Reveal: letters rise up out of the page one by one, growing a
    // solid extruded side and a soft shadow as they come up.
    // Usage: <h1 data-extrude-reveal>Extrude</h1>
    // Optional: data-color (the extruded side, default the text colour mixed
    // with black), data-depth (in em, default 0.12), data-duration (ms per
    // letter, default 1000), data-stagger (ms between letters, default 60),
    // data-loop (sink back into the page and rise again), data-hold (ms to stay
    // up, when looping), data-delay (ms before starting).
    var DEFAULTS = { depth: 0.12, duration: 1000, stagger: 60, hold: 1800, delay: 0 };

    var css =
      '.exr-word{display:inline-block;white-space:nowrap}' +
      '.exr-ch{display:inline-block;will-change:transform}';
    var style = document.createElement('style');
    style.textContent = css;
    document.head.appendChild(style);

    function reduced() {
      return window.matchMedia('(prefers-reduced-motion: reduce)').matches;
    }

    function split(el) {
      var text = el.textContent.replace(/\s+/g, ' ').trim();
      el.setAttribute('aria-label', text);
      el.textContent = '';
      var chars = [];
      text.split(' ').forEach(function (word, i) {
        if (i) el.appendChild(document.createTextNode(' '));
        var w = document.createElement('span');
        w.className = 'exr-word';
        w.setAttribute('aria-hidden', 'true');
        Array.from(word).forEach(function (c) {
          var s = document.createElement('span');
          s.className = 'exr-ch';
          s.textContent = c;
          w.appendChild(s);
          chars.push({ el: s, k: 0 });
        });
        el.appendChild(w);
      });
      return chars;
    }

    // Draws a letter raised by `k` (0 = flat on the page, 1 = full depth): the
    // face lifts up-left and a stack of 1px shadows fills in the side.
    function draw(c, depth, side) {
      var k = c.k, dz = depth * k;
      var layers = Math.round(dz);
      var parts = [];
      for (var i = 1; i <= layers; i++) parts.push((i * 0.6).toFixed(1) + 'px ' + i + 'px 0 ' + side);
      var soft = Math.max(0, dz);
      parts.push((soft * 0.8).toFixed(1) + 'px ' + (soft * 1.4 + 1).toFixed(1) + 'px ' + (soft * 1.2).toFixed(1) + 'px rgba(0,0,0,' + (0.22 * Math.min(1, k)).toFixed(3) + ')');
      c.el.style.textShadow = parts.join(',');
      c.el.style.transform = 'translate(' + (-dz * 0.6).toFixed(1) + 'px,' + (-dz).toFixed(1) + 'px)';
      c.el.style.opacity = Math.min(1, 0.1 + k * 2.5).toFixed(3);
    }

    function rise(el, up, done) {
      var s = el._exr, d = el.dataset;
      var cs = getComputedStyle(el);
      var depth = Math.max(3, parseFloat(cs.fontSize) * (+d.depth || DEFAULTS.depth));
      var side = d.color || 'color-mix(in srgb, ' + cs.color + ' 55%, #000)';
      var duration = +d.duration || DEFAULTS.duration;
      var stagger = d.stagger !== undefined ? +d.stagger : DEFAULTS.stagger;
      var left = s.chars.length;
      s.chars.forEach(function (c, i) {
        anime.animate(c, {
          k: up ? [0, 1] : [1, 0],
          duration: up ? duration : duration * 0.5,
          delay: i * (up ? stagger : stagger * 0.5),
          ease: up ? 'outBack(1.6)' : 'inQuad',
          onUpdate: function () { draw(c, depth, side); },
          onComplete: function () {
            if (!up) c.el.style.opacity = 0;
            if (--left === 0 && done) done();
          }
        });
      });
    }

    function play(el) {
      var d = el.dataset;
      var loop = d.loop !== undefined && d.loop !== 'false';
      rise(el, true, function () {
        if (!loop) return;
        setTimeout(function () {
          rise(el, false, function () { setTimeout(function () { play(el); }, 400); });
        }, +d.hold || DEFAULTS.hold);
      });
    }

    function init() {
      var io = new IntersectionObserver(function (entries) {
        entries.forEach(function (e) {
          if (!e.isIntersecting) return;
          io.unobserve(e.target);
          var el = e.target;
          setTimeout(function () { play(el); }, +el.dataset.delay || DEFAULTS.delay);
        });
      }, { threshold: 0.2 });
      document.querySelectorAll('[data-extrude-reveal]').forEach(function (el) {
        if (el._exr) return;
        el._exr = { chars: split(el) };
        var cs = getComputedStyle(el);
        var depth = Math.max(3, parseFloat(cs.fontSize) * (+el.dataset.depth || DEFAULTS.depth));
        var side = el.dataset.color || 'color-mix(in srgb, ' + cs.color + ' 55%, #000)';
        el._exr.chars.forEach(function (c) {
          c.k = reduced() ? 1 : 0;
          draw(c, depth, side);
          if (!reduced()) c.el.style.opacity = 0;
        });
        if (!reduced()) io.observe(el);
      });
    }

    if (document.readyState === 'loading') document.addEventListener('DOMContentLoaded', init);
    else init();
  })();
</script>

<h1 data-extrude-reveal>Extrude</h1>

<!-- or, deeper, with a navy side: -->
<h1 data-extrude-reveal data-depth="0.2" data-color="#1e1b4b">Extrude</h1>