Bootstrap 5 Animated Horizontal Timeline

<section class="wdw-stage">
  <div class="container" style="max-width:960px">
    <div class="mb-4"><span class="wdw-eyebrow">Our story</span><h2 class="wdw-heading display-6 mt-1">Company timeline</h2></div>
    <div class="wdw-card p-4 p-md-5">
      <div class="tl-track-wrap">
        <ol class="tl-track list-unstyled" id="tlTrack" role="tablist" aria-label="Timeline years"><li class="tl-step" role="presentation"><button type="button" role="tab" class="tl-dot" id="tlt0" aria-controls="tlp0" aria-selected="true" tabindex="0"><span class="tl-year">2014</span><span class="tl-mark" aria-hidden="true"></span></button></li><li class="tl-step" role="presentation"><button type="button" role="tab" class="tl-dot" id="tlt1" aria-controls="tlp1" aria-selected="false" tabindex="-1"><span class="tl-year">2016</span><span class="tl-mark" aria-hidden="true"></span></button></li><li class="tl-step" role="presentation"><button type="button" role="tab" class="tl-dot" id="tlt2" aria-controls="tlp2" aria-selected="false" tabindex="-1"><span class="tl-year">2018</span><span class="tl-mark" aria-hidden="true"></span></button></li><li class="tl-step" role="presentation"><button type="button" role="tab" class="tl-dot" id="tlt3" aria-controls="tlp3" aria-selected="false" tabindex="-1"><span class="tl-year">2020</span><span class="tl-mark" aria-hidden="true"></span></button></li><li class="tl-step" role="presentation"><button type="button" role="tab" class="tl-dot" id="tlt4" aria-controls="tlp4" aria-selected="false" tabindex="-1"><span class="tl-year">2022</span><span class="tl-mark" aria-hidden="true"></span></button></li><li class="tl-step" role="presentation"><button type="button" role="tab" class="tl-dot" id="tlt5" aria-controls="tlp5" aria-selected="false" tabindex="-1"><span class="tl-year">2024</span><span class="tl-mark" aria-hidden="true"></span></button></li><li class="tl-step" role="presentation"><button type="button" role="tab" class="tl-dot" id="tlt6" aria-controls="tlp6" aria-selected="false" tabindex="-1"><span class="tl-year">2026</span><span class="tl-mark" aria-hidden="true"></span></button></li></ol>
      </div>
      <div class="tl-body" id="tlBody"><div class="tl-panel" id="tlp0" role="tabpanel" tabindex="0" aria-labelledby="tlt0"><div class="d-flex flex-column flex-sm-row gap-4 align-items-sm-start"><span class="wdw-icon tl-ico" aria-hidden="true"><svg width="30" height="30" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.75" stroke-linecap="round" stroke-linejoin="round"><path d="M12 2l3 7h7l-5.5 4.5L18 21l-6-4-6 4 1.5-7.5L2 9h7z"/></svg></span><div><span class="wdw-eyebrow">2014</span><h3 class="wdw-heading display-6 mt-1 mb-2">Founded</h3><p class="wdw-muted fs-5 mb-4">Two designers start the studio in a shared garage with a single client and a borrowed monitor.</p><div class="d-flex flex-wrap gap-3"><div class="tl-chip"><strong>2</strong><span>Founders</span></div><div class="tl-chip"><strong>1</strong><span>First client</span></div><div class="tl-chip"><strong>0</strong><span>Funding</span></div></div></div></div></div><div class="tl-panel" id="tlp1" role="tabpanel" tabindex="0" aria-labelledby="tlt1" hidden><div class="d-flex flex-column flex-sm-row gap-4 align-items-sm-start"><span class="wdw-icon tl-ico" aria-hidden="true"><svg width="30" height="30" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.75" stroke-linecap="round" stroke-linejoin="round"><path d="M21 16V8l-9-5-9 5v8l9 5 9-5zM3.3 7L12 12l8.7-5M12 22V12"/></svg></span><div><span class="wdw-eyebrow">2016</span><h3 class="wdw-heading display-6 mt-1 mb-2">First product</h3><p class="wdw-muted fs-5 mb-4">Launch of the original UI kit, downloaded 10,000 times in its first month.</p><div class="d-flex flex-wrap gap-3"><div class="tl-chip"><strong>10k</strong><span>Downloads</span></div><div class="tl-chip"><strong>1</strong><span>Product</span></div><div class="tl-chip"><strong>4</strong><span>Countries</span></div></div></div></div></div><div class="tl-panel" id="tlp2" role="tabpanel" tabindex="0" aria-labelledby="tlt2" hidden><div class="d-flex flex-column flex-sm-row gap-4 align-items-sm-start"><span class="wdw-icon tl-ico" aria-hidden="true"><svg width="30" height="30" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.75" stroke-linecap="round" stroke-linejoin="round"><path d="M17 21v-2a4 4 0 0 0-4-4H5a4 4 0 0 0-4 4v2M9 11a4 4 0 1 0 0-8 4 4 0 0 0 0 8zM23 21v-2a4 4 0 0 0-3-3.9M16 3.1a4 4 0 0 1 0 7.8"/></svg></span><div><span class="wdw-eyebrow">2018</span><h3 class="wdw-heading display-6 mt-1 mb-2">Team of 12</h3><p class="wdw-muted fs-5 mb-4">The studio moves into its first office and opens a second design practice.</p><div class="d-flex flex-wrap gap-3"><div class="tl-chip"><strong>12</strong><span>People</span></div><div class="tl-chip"><strong>2</strong><span>Practices</span></div><div class="tl-chip"><strong>1</strong><span>Office</span></div></div></div></div></div><div class="tl-panel" id="tlp3" role="tabpanel" tabindex="0" aria-labelledby="tlt3" hidden><div class="d-flex flex-column flex-sm-row gap-4 align-items-sm-start"><span class="wdw-icon tl-ico" aria-hidden="true"><svg width="30" height="30" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.75" stroke-linecap="round" stroke-linejoin="round"><path d="M3 12a9 9 0 1 0 18 0 9 9 0 0 0-18 0zM3 12h18M12 3a14 14 0 0 1 0 18M12 3a14 14 0 0 0 0 18"/></svg></span><div><span class="wdw-eyebrow">2020</span><h3 class="wdw-heading display-6 mt-1 mb-2">Going remote</h3><p class="wdw-muted fs-5 mb-4">The whole team goes remote and ships the redesigned component library.</p><div class="d-flex flex-wrap gap-3"><div class="tl-chip"><strong>100%</strong><span>Remote</span></div><div class="tl-chip"><strong>40</strong><span>Components</span></div><div class="tl-chip"><strong>9</strong><span>Time zones</span></div></div></div></div></div><div class="tl-panel" id="tlp4" role="tabpanel" tabindex="0" aria-labelledby="tlt4" hidden><div class="d-flex flex-column flex-sm-row gap-4 align-items-sm-start"><span class="wdw-icon tl-ico" aria-hidden="true"><svg width="30" height="30" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.75" stroke-linecap="round" stroke-linejoin="round"><path d="M16 18l6-6-6-6M8 6l-6 6 6 6"/></svg></span><div><span class="wdw-eyebrow">2022</span><h3 class="wdw-heading display-6 mt-1 mb-2">Open source</h3><p class="wdw-muted fs-5 mb-4">The core library is released under an open licence and gains a global community.</p><div class="d-flex flex-wrap gap-3"><div class="tl-chip"><strong>MIT</strong><span>Licence</span></div><div class="tl-chip"><strong>5k</strong><span>Stars</span></div><div class="tl-chip"><strong>300</strong><span>Contributors</span></div></div></div></div></div><div class="tl-panel" id="tlp5" role="tabpanel" tabindex="0" aria-labelledby="tlt5" hidden><div class="d-flex flex-column flex-sm-row gap-4 align-items-sm-start"><span class="wdw-icon tl-ico" aria-hidden="true"><svg width="30" height="30" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.75" stroke-linecap="round" stroke-linejoin="round"><path d="M12 3v12M7 10l5 5 5-5M5 21h14"/></svg></span><div><span class="wdw-eyebrow">2024</span><h3 class="wdw-heading display-6 mt-1 mb-2">1M downloads</h3><p class="wdw-muted fs-5 mb-4">Cumulative downloads pass one million across 90 countries.</p><div class="d-flex flex-wrap gap-3"><div class="tl-chip"><strong>1M</strong><span>Downloads</span></div><div class="tl-chip"><strong>90</strong><span>Countries</span></div><div class="tl-chip"><strong>4.9</strong><span>Rating</span></div></div></div></div></div><div class="tl-panel" id="tlp6" role="tabpanel" tabindex="0" aria-labelledby="tlt6" hidden><div class="d-flex flex-column flex-sm-row gap-4 align-items-sm-start"><span class="wdw-icon tl-ico" aria-hidden="true"><svg width="30" height="30" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.75" stroke-linecap="round" stroke-linejoin="round"><path d="M5 12h14M13 6l6 6-6 6"/></svg></span><div><span class="wdw-eyebrow">2026</span><h3 class="wdw-heading display-6 mt-1 mb-2">Next chapter</h3><p class="wdw-muted fs-5 mb-4">A new generation of tools built on Bootstrap 5.3 and vanilla JavaScript.</p><div class="d-flex flex-wrap gap-3"><div class="tl-chip"><strong>5.3</strong><span>Bootstrap</span></div><div class="tl-chip"><strong>0</strong><span>Dependencies</span></div><div class="tl-chip"><strong>1</strong><span>Mission</span></div></div></div></div></div></div>
      <div class="d-flex gap-2 mt-4 align-items-center">
        <button type="button" class="btn btn-outline-primary rounded-pill" id="tlPrev">← Previous</button>
        <button type="button" class="btn btn-primary rounded-pill" id="tlNext">Next →</button>
        <span class="ms-auto small wdw-muted" id="tlCount" aria-live="polite"></span>
      </div>
    </div>
  </div>
</section>

/* Web Designer Wall library style — shared base for every Bootstrap 5 snippet.
   Indigo accent, Plus Jakarta Sans, soft cards, pill buttons. Works in light and dark. */
@import url("https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap");

:root,
[data-bs-theme="light"] {
  --wdw-font: "Plus Jakarta Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --bs-body-font-family: var(--wdw-font);
  --bs-primary: #4f46e5;
  --bs-primary-rgb: 79, 70, 229;
  --bs-primary-text-emphasis: #3730a3;
  --bs-primary-bg-subtle: #eef2ff;
  --bs-primary-border-subtle: #c7d2fe;
  --bs-link-color: #4f46e5;
  --bs-link-color-rgb: 79, 70, 229;
  --bs-link-hover-color: #4338ca;
  --bs-link-hover-color-rgb: 67, 56, 202;
  --bs-focus-ring-color: rgba(79, 70, 229, 0.25);
  --bs-border-radius: 0.75rem;
  --bs-border-radius-lg: 1rem;
  --bs-border-radius-xl: 1.25rem;
  --wdw-radius-card: 1.25rem;
  --wdw-shadow: 0 1px 2px rgba(16, 24, 40, 0.05), 0 16px 40px -16px rgba(16, 24, 40, 0.22);
  --wdw-shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.06), 0 4px 12px -4px rgba(16, 24, 40, 0.12);
  --wdw-stage: #f5f6fb;
}

[data-bs-theme="dark"] {
  --bs-primary: #818cf8;
  --bs-primary-rgb: 129, 140, 248;
  --bs-primary-text-emphasis: #c7d2fe;
  --bs-primary-bg-subtle: rgba(129, 140, 248, 0.14);
  --bs-primary-border-subtle: rgba(129, 140, 248, 0.35);
  --bs-link-color: #a5b4fc;
  --bs-link-color-rgb: 165, 180, 252;
  --bs-link-hover-color: #c7d2fe;
  --bs-link-hover-color-rgb: 199, 210, 254;
  --bs-focus-ring-color: rgba(129, 140, 248, 0.35);
  --wdw-shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 16px 40px -16px rgba(0, 0, 0, 0.7);
  --wdw-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4), 0 4px 12px -4px rgba(0, 0, 0, 0.5);
  --wdw-stage: #0f1117;
}

body { font-family: var(--wdw-font); -webkit-font-smoothing: antialiased; }

/* Bootstrap compiles its blue into these components; point them at the accent. */
.btn-primary {
  --bs-btn-bg: var(--bs-primary); --bs-btn-border-color: var(--bs-primary);
  --bs-btn-hover-bg: #4338ca; --bs-btn-hover-border-color: #4338ca;
  --bs-btn-active-bg: #3730a3; --bs-btn-active-border-color: #3730a3;
  --bs-btn-disabled-bg: var(--bs-primary); --bs-btn-disabled-border-color: var(--bs-primary);
  --bs-btn-focus-shadow-rgb: var(--bs-primary-rgb);
}
[data-bs-theme="dark"] .btn-primary { --bs-btn-color: #0f1117; --bs-btn-hover-bg: #a5b4fc; --bs-btn-hover-border-color: #a5b4fc; --bs-btn-hover-color: #0f1117; --bs-btn-active-color: #0f1117; }
.btn-outline-primary {
  --bs-btn-color: var(--bs-primary); --bs-btn-border-color: var(--bs-primary);
  --bs-btn-hover-bg: var(--bs-primary); --bs-btn-hover-border-color: var(--bs-primary);
  --bs-btn-active-bg: var(--bs-primary); --bs-btn-active-border-color: var(--bs-primary);
  --bs-btn-focus-shadow-rgb: var(--bs-primary-rgb);
}
.btn { --bs-btn-font-weight: 600; min-height: 44px; display: inline-flex; align-items: center; justify-content: center; gap: .5rem; }
.btn-sm { min-height: 36px; }
.form-control, .form-select { min-height: 44px; border-radius: .75rem; }
.form-control:focus, .form-select:focus, .form-check-input:focus { border-color: rgba(var(--bs-primary-rgb), .6); box-shadow: 0 0 0 .25rem var(--bs-focus-ring-color); }
.form-check-input:checked { background-color: var(--bs-primary); border-color: var(--bs-primary); }
.nav-pills { --bs-nav-pills-link-active-bg: var(--bs-primary); }
.nav { --bs-nav-link-color: var(--bs-secondary-color); --bs-nav-link-hover-color: var(--bs-emphasis-color); }
.pagination { --bs-pagination-active-bg: var(--bs-primary); --bs-pagination-active-border-color: var(--bs-primary); --bs-pagination-color: var(--bs-body-color); --bs-pagination-focus-box-shadow: 0 0 0 .25rem var(--bs-focus-ring-color); }
.progress, .progress-stacked { --bs-progress-bar-bg: var(--bs-primary); }
.list-group { --bs-list-group-active-bg: var(--bs-primary); --bs-list-group-active-border-color: var(--bs-primary); }
.dropdown-menu { --bs-dropdown-link-active-bg: var(--bs-primary); border-radius: .875rem; box-shadow: var(--wdw-shadow-sm); }
.accordion { --bs-accordion-active-bg: var(--bs-primary-bg-subtle); --bs-accordion-active-color: var(--bs-primary-text-emphasis); --bs-accordion-btn-focus-box-shadow: 0 0 0 .25rem var(--bs-focus-ring-color); }
.badge { font-weight: 600; }

/* Library building blocks — use these instead of re-inventing them per snippet. */
.wdw-stage { min-height: 100vh; display: flex; align-items: center; background: var(--wdw-stage); padding-block: 3rem; }
.wdw-card { background: var(--bs-body-bg); border: 1px solid var(--bs-border-color-translucent); border-radius: var(--wdw-radius-card); box-shadow: var(--wdw-shadow); }
.wdw-card-sm { background: var(--bs-body-bg); border: 1px solid var(--bs-border-color-translucent); border-radius: 1rem; box-shadow: var(--wdw-shadow-sm); }
.wdw-aurora { position: relative; color: #fff; background: radial-gradient(60% 55% at 100% 0, #818cf8 0, transparent 70%), radial-gradient(65% 60% at 0 100%, #ec4899 0, transparent 65%), #1e1b4b; }
.wdw-eyebrow { display: inline-block; font-size: .75rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--bs-primary); }
.wdw-heading { font-weight: 800; letter-spacing: -.02em; color: var(--bs-emphasis-color); }
.wdw-muted { color: var(--bs-secondary-color); }
.wdw-icon { width: 2.75rem; height: 2.75rem; flex: none; display: inline-flex; align-items: center; justify-content: center; border-radius: .875rem; background: var(--bs-primary-bg-subtle); color: var(--bs-primary); }

/* Component */
.tl-track-wrap{overflow-x:auto;scrollbar-width:none;margin:0 -.5rem;padding:0 .5rem}
@media (max-width:575.98px){.tl-track-wrap{-webkit-mask-image:linear-gradient(90deg,#000 80%,transparent);mask-image:linear-gradient(90deg,#000 80%,transparent)}.tl-step{flex-basis:96px}}
.tl-track-wrap::-webkit-scrollbar{display:none}
.tl-track{display:flex;margin:0;padding:0;min-width:100%;width:max-content;position:relative}
.tl-step{flex:1 0 110px}
.tl-dot{all:unset;box-sizing:border-box;cursor:pointer;display:flex;flex-direction:column;align-items:center;gap:.6rem;width:100%;min-height:44px;padding-bottom:.25rem;position:relative}
.tl-dot:focus-visible{outline:3px solid var(--bs-primary);outline-offset:2px;border-radius:.5rem}
.tl-year{font-weight:700;font-size:.95rem;color:var(--bs-secondary-color);transition:color .2s,transform .2s}
.tl-mark{width:14px;height:14px;border-radius:50%;background:var(--bs-body-bg);border:3px solid var(--bs-border-color);position:relative;z-index:1;transition:all .25s}
.tl-dot::after{content:"";position:absolute;left:50%;right:-50%;bottom:calc(.25rem + 6px);height:2px;background:var(--bs-border-color)}
.tl-step.is-done .tl-dot::after{background:var(--bs-primary)}
.tl-step.is-done .tl-mark{border-color:var(--bs-primary)}
.tl-step:last-child .tl-dot::after{display:none}
.tl-dot[aria-selected=true] .tl-year{color:var(--bs-primary);transform:scale(1.15)}
.tl-dot[aria-selected=true] .tl-mark{border-color:var(--bs-primary);background:var(--bs-primary);box-shadow:0 0 0 5px var(--bs-primary-bg-subtle)}
.tl-body{margin-top:2rem;padding-top:1.75rem;border-top:1px solid var(--bs-border-color);min-height:260px}
.tl-panel:focus-visible{outline:3px solid var(--bs-primary);outline-offset:6px;border-radius:.5rem}
.tl-ico{width:4.5rem;height:4.5rem;border-radius:1.25rem}
.tl-chip{min-width:110px;padding:.75rem 1.1rem;border-radius:1rem;background:var(--bs-primary-bg-subtle);display:flex;flex-direction:column}
.tl-chip strong{font-size:1.5rem;font-weight:800;color:var(--bs-primary-text-emphasis);line-height:1.1}
.tl-chip span{font-size:.8rem;color:var(--bs-secondary-color)}
#tlPrev:disabled,#tlNext:disabled{opacity:.45;border-color:var(--bs-border-color);color:var(--bs-secondary-color)}
#tlNext:disabled{background:var(--bs-secondary-bg);border-color:var(--bs-secondary-bg)}
.tl-panel:not([hidden]){animation:tlIn .4s ease both}
@keyframes tlIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
@media (prefers-reduced-motion:reduce){.tl-panel:not([hidden]){animation:none}}

(function initTimeline() {
  var track = document.getElementById('tlTrack');
  if (!track) return;
  var dots = Array.prototype.slice.call(track.querySelectorAll('.tl-dot'));
  var panels = Array.prototype.slice.call(document.querySelectorAll('.tl-panel'));
  var count = document.getElementById('tlCount');
  var cur = 0;
  function show(i, focus) {
    cur = Math.max(0, Math.min(dots.length - 1, i));
    dots.forEach(function (d, k) {
      d.setAttribute('aria-selected', k === cur ? 'true' : 'false');
      d.tabIndex = k === cur ? 0 : -1;
      d.parentElement.classList.toggle('is-done', k < cur);
      panels[k].hidden = k !== cur;
    });
    if (focus) dots[cur].focus({ preventScroll: true });
    var wrap = track.parentElement, d = dots[cur];
    wrap.scrollTo({ left: d.parentElement.offsetLeft - wrap.clientWidth / 2 + d.offsetWidth / 2, behavior: 'smooth' });
    count.textContent = (cur + 1) + ' / ' + dots.length;
    document.getElementById('tlPrev').disabled = cur === 0;
    document.getElementById('tlNext').disabled = cur === dots.length - 1;
  }
  dots.forEach(function (d, k) { d.addEventListener('click', function () { show(k); }); });
  track.addEventListener('keydown', function (e) {
    if (e.key === 'ArrowRight') { e.preventDefault(); show(cur + 1, true); }
    if (e.key === 'ArrowLeft') { e.preventDefault(); show(cur - 1, true); }
  });
  document.getElementById('tlPrev').addEventListener('click', function () { show(cur - 1); });
  document.getElementById('tlNext').addEventListener('click', function () { show(cur + 1); });
  show(0);
})();