Full-width Tabs

<!-- Equal-width tabs: each tab is flex-1 with min-w-0/truncate, so the strip fills the row and long labels shorten instead of overflowing. -->
<div class="max-w-2xl" data-tabs-fullwidth>
  <div class="flex border-b border-gray-200 dark:border-gray-800" role="tablist" aria-label="Account tabs">
    <button class="-mb-px min-w-0 flex-1 truncate border-b-2 border-transparent px-2 py-2.5 text-center text-sm font-medium text-gray-600 transition-colors hover:text-gray-900 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-inset focus-visible:ring-blue-600 motion-reduce:transition-none aria-selected:border-blue-600 aria-selected:text-blue-600 dark:text-gray-400 dark:hover:text-gray-100 dark:focus-visible:ring-blue-400 dark:aria-selected:border-blue-400 dark:aria-selected:text-blue-400" type="button" role="tab" id="fw-summary" aria-controls="fw-panel-summary" aria-selected="true" tabindex="0">Summary</button>
    <button class="-mb-px min-w-0 flex-1 truncate border-b-2 border-transparent px-2 py-2.5 text-center text-sm font-medium text-gray-600 transition-colors hover:text-gray-900 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-inset focus-visible:ring-blue-600 motion-reduce:transition-none aria-selected:border-blue-600 aria-selected:text-blue-600 dark:text-gray-400 dark:hover:text-gray-100 dark:focus-visible:ring-blue-400 dark:aria-selected:border-blue-400 dark:aria-selected:text-blue-400" type="button" role="tab" id="fw-activity" aria-controls="fw-panel-activity" aria-selected="false" tabindex="-1">Activity</button>
    <button class="-mb-px min-w-0 flex-1 truncate border-b-2 border-transparent px-2 py-2.5 text-center text-sm font-medium text-gray-600 transition-colors hover:text-gray-900 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-inset focus-visible:ring-blue-600 motion-reduce:transition-none aria-selected:border-blue-600 aria-selected:text-blue-600 dark:text-gray-400 dark:hover:text-gray-100 dark:focus-visible:ring-blue-400 dark:aria-selected:border-blue-400 dark:aria-selected:text-blue-400" type="button" role="tab" id="fw-notes" aria-controls="fw-panel-notes" aria-selected="false" tabindex="-1">Notes</button>
  </div>

  <div class="pt-4 text-sm leading-relaxed text-gray-600 focus-visible:rounded-md focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-blue-600 dark:text-gray-300 dark:focus-visible:ring-blue-400" role="tabpanel" id="fw-panel-summary" aria-labelledby="fw-summary" tabindex="0"><p>Key numbers for the account at a glance.</p></div>
  <div class="pt-4 text-sm leading-relaxed text-gray-600 focus-visible:rounded-md focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-blue-600 dark:text-gray-300 dark:focus-visible:ring-blue-400" role="tabpanel" id="fw-panel-activity" aria-labelledby="fw-activity" tabindex="0" hidden><p>The most recent events on this account.</p></div>
  <div class="pt-4 text-sm leading-relaxed text-gray-600 focus-visible:rounded-md focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-blue-600 dark:text-gray-300 dark:focus-visible:ring-blue-400" role="tabpanel" id="fw-panel-notes" aria-labelledby="fw-notes" tabindex="0" hidden><p>Internal notes shared with your team.</p></div>
</div>

<script>
  (function () {
    document.querySelectorAll('[data-tabs-fullwidth]').forEach(function (root) {
      var tabs = [].slice.call(root.querySelectorAll('[role="tab"]'));
      function panelFor(t) { return document.getElementById(t.getAttribute('aria-controls')); }
      function select(i, focus) {
        tabs.forEach(function (t, n) {
          var on = n === i;
          t.setAttribute('aria-selected', String(on));
          t.tabIndex = on ? 0 : -1;
          var p = panelFor(t);
          if (p) p.hidden = !on;
        });
        if (focus) tabs[i].focus();
      }
      tabs.forEach(function (t, i) {
        t.addEventListener('click', function () { select(i, false); });
        t.addEventListener('keydown', function (e) {
          var n = -1;
          if (e.key === 'ArrowRight') n = (i + 1) % tabs.length;
          else if (e.key === 'ArrowLeft') n = (i - 1 + tabs.length) % tabs.length;
          else if (e.key === 'Home') n = 0;
          else if (e.key === 'End') n = tabs.length - 1;
          else return;
          e.preventDefault();
          select(n, true);
        });
      });
    });
  })();
</script>