# Tag input

Subtle web animation sketch from [https://mighil.com/animations](https://mighil.com/animations).

- **Live demo:** https://mighil.com/animations/tag-input
- **Standalone HTML:** https://mighil.com/animations/tag-input?download=1
- **This file:** https://mighil.com/animations/tag-input/tag-input.md
- **Technique:** `chips`

## What it does

Hit Enter and it becomes a chip right there.

## Instructions for AI / coding agents

Implement this micro-interaction in the user's stack (vanilla HTML, React, Vue, Svelte, etc.).

1. Use the **HTML** as the DOM structure (adapt JSX/templates as needed; keep class names and ids).
2. Include the **Theme** CSS (or map the same variables into the host design system). It switches light/dark with `prefers-color-scheme`.
3. Apply the **CSS** as-is when possible. It uses `var(--text-color)`, `var(--heading-color)`, `var(--background-color)`, etc. from the theme so both modes work.
4. Run the **JavaScript** after the markup mounts. Prefer `DOMContentLoaded` or a framework `useEffect` / `onMount`.
5. Keep motion respectful of `prefers-reduced-motion` if the snippet already checks it.
6. Do not depend on mighil.com runtime or fonts. Theme variables are enough for color.
7. If porting to a component, expose the interactive root via a ref and preserve accessibility attributes (`aria-*`, `role`, `button` types).

## Theme (auto light / dark)

```css
/* Auto light / dark — follows prefers-color-scheme */
:root{
  color-scheme: light dark;
  --text-color: hsl(0, 0%, 18%);
  --heading-color: hsl(0, 0%, 18%);
  --background-color: hsl(0, 0%, 99%);
  --bg-color: hsl(0, 0%, 99%);
  --link-color: hsl(0, 0%, 18%);
  --visited-color: hsl(0, 0%, 18%);
  --blockquote-color: hsl(0, 0%, 18%);
  --code-bg-color: hsl(0, 0%, 95%);
  --code-color: hsl(0, 0%, 18%);
  --sub-color: hsl(0, 0%, 29%);
}
@media (prefers-color-scheme: dark){
:root{
  --text-color: hsl(35, 25%, 85%);
  --heading-color: hsl(35.2, 32.6%, 82.5%);
  --background-color: hsl(60, 2.2%, 8.8%);
  --bg-color: hsl(60, 2.2%, 8.8%);
  --link-color: hsl(34.7, 55.3%, 79.8%);
  --visited-color: hsla(34.7, 55.3%, 79.8%, 0.85);
  --blockquote-color: hsl(35, 30%, 75%);
  --code-bg-color: hsl(30, 5%, 7.8%);
  --code-color: limegreen;
  --sub-color: hsla(34.7, 24.7%, 84.9%, 0.78);
}
}
```

## HTML

```html
<div class="tag-field">
        <div class="tag-box" id="tag-box">
          <input type="text" class="tag-input" id="tag-input" placeholder="Add tag…" aria-label="Add tag" autocomplete="off">
        </div>
      </div>
```

## CSS

```css
@keyframes tag-in{from{opacity:0;transform:translateY(3px)}to{opacity:1;transform:none}}

.tag-field{width:min(100%,320px);display:flex;flex-direction:column;gap:8px}

.tag-box{
  min-height:40px;padding:6px 8px;border-radius:8px;box-sizing:border-box;
  display:flex;flex-wrap:wrap;align-items:center;gap:6px;
  border:1px solid color-mix(in srgb,var(--text-color) 14%,transparent);
  transition:border-color .2s ease, box-shadow .2s ease;
}

.tag-box:focus-within{border-color:color-mix(in srgb,var(--text-color) 40%,transparent);box-shadow:0 0 0 3px color-mix(in srgb,var(--text-color) 8%,transparent)}

.tag-chip{
  display:inline-flex;align-items:center;gap:4px;height:26px;padding:0 6px 0 10px;border-radius:999px;
  font-size:.78rem;font-weight:500;line-height:1;
  background:color-mix(in srgb,var(--text-color) 8%,transparent);
  animation:tag-in .22s ease-out;
}

.tag-chip button{
  appearance:none;-webkit-appearance:none;width:18px;height:18px;border:0;border-radius:50%;cursor:pointer;
  background:transparent;color:inherit;font:inherit;line-height:1;opacity:.55;
}

.tag-box input{
  flex:1;min-width:72px;height:26px;margin:0;padding:0 4px;border:0;background:transparent;
  font:inherit;font-size:.88rem;color:inherit;outline:none;
}

@media (prefers-reduced-motion: reduce){
  .breath-dot,.breath-ring,.wave.is-live span,.ink-drop,
  .marquee-track,
  .skel-line,.save-btn.is-loading .spin,.badge.is-bump,.like-btn.is-pop,.save-status.is-saving .dot,.stars button.is-pop svg,
  .field.is-invalid input,.save-btn.is-done .check path,.ux-check[aria-checked="true"] .ux-box path,.char-meta.is-warn,.success-banner.is-on path,
  .typing span,.conn-dot,.indet > i,.toast.is-on .toast-timer > i,.stagger-list.is-in .stagger-item,.submit-wrap.is-loading .submit-ring rect,.submit-wrap.is-settle,.hold-btn.is-settle,.confirm-btn.is-settle,.sync-btn.is-settle,.invite-btn.is-settle,.retry-btn.is-shake-err,.retry-btn.is-shake-ok,.cart-badge.is-pop,.mute-btn .x-line,.presence.is-ping .presence-dot::after,.tag-chip,.nudge-field.is-nudge,.tilt-scene:hover .tilt-tile::before,.demo-replay.is-tap,.hit.is-tap,.stack-toggle.is-tap,.nudge-btn.is-tap,.wipe.is-tap,.save-btn.is-tap,.copy-btn.is-tap,.like-btn.is-tap,.pin-btn.is-tap,.retry-btn.is-tap,.wizard-nav button.is-tap,.mute-btn.is-tap,
  .scan:hover::after,.scan.is-on::after,.cascade.is-in b,.stepper-val.is-bump,.otp input.is-pop,.rel-time.is-live .rel-dot,.sync-btn.is-spin .sync-arrows,.ok-field.is-ok .ok-check path,.unread-row.is-read .unread-check path,.mic-btn.is-on::before,.mic-btn.is-on::after,.ghost-wrap.is-flash,.cmd-palette li.is-run,.flag-row.is-warn,.mention.is-flash b{animation:none!important}

  .grow-link::after,.wipe,.wipe .b,.shuffle .card,.odo-digit > b,.flap-reel,.step-node,.step-line > i,
  .switch,.switch::after,.copy-btn .c-idle,.copy-btn .c-done,.field label,.tip-bubble,.chip,.like-btn svg,
  .disc-btn svg,.disc-panel,.snack,.save-btn,.ux-box,.seg-pill,.soft-tabs-ink,.list-actions,.success-banner,.search-clear,.pin-btn svg,.submit-ring rect,
  .hold-btn .hold-fill,.toast,.menu-btn .menu-line,.stars button,.conn,.retry-btn,.sort-item,.mute-btn .wave,.mute-btn .x-line,.wizard-dots span,.cart-badge,.range-bubble,
  .filter-list li,.upload-bar > i,.quota-track > i,.quota-tip,.splitbtn-toggle svg,.splitbtn-menu,.presence-dot,
  .draft-banner,.tag-chip,.empty-state,.empty-item,.deadline,.deadline-clock,.deadline-track > i,.edge-fade-mask,.dirty-bar,.seen-ticks path,.nudge-field,.stack-card,
  .blur-line,.xface span,.magnet-chip,.confirm-btn,.confirm-btn span,.offline-banner,.sort-flip-btn svg,.sort-flip-list li,.react-fan,.react-fan button,.sticky-cta,
  .pw-toggle .pw-eye,.pw-toggle .pw-slash,.otp input,.exp-search,.exp-search input,.ok-field input,.ok-field .ok-check,.unread-dot,.unread-check,.unread-row,.sync-label,.sync-btn .sync-arrows,.sync-btn .sync-check,
  .inline-edit .ie-title,.inline-edit .ie-rename,.inline-edit .ie-panel,.inline-edit .ie-input,.inline-edit .ie-bar,
  .ghost-wrap .ghost-hint,.ghost-wrap .ghost-key,.cmd-palette,.cmd-palette li,.cmd-stage::before,.crumb-mid,.crumb-more,.diff-add,.diff-add > .diff-add-inner,.slot > i,.zoom-thumb,.zoom-full,.zoom-caption,
  .bulk-bar,.bulk-check svg,.bulk-row,.env-switch .env-ink,.env-switch button,.invite-btn .invite-idle,.invite-btn .invite-done,.flag-row,.flag-sw,.flag-sw::after,.deploy-node,.deploy-node i,.deploy-wire > b,.ws-ink,.ws-item .ws-check,.thread,.thread-body,.thread-resolve svg,
  .unfurl-card,.unfurl-thumb,.seat,.form-prog-bar > i,.form-prog-field,.form-prog-field svg,.mention b,.glyph-tile path,.glyph-tile line,.glyph-tile circle{transition:none!important}
}
```

## JavaScript

```js
// Tag input
  const tagBox = document.getElementById('tag-box');
  const tagInput = document.querySelector('input.tag-input');
  function addTag(label) {
    if (!tagBox || !tagInput || !label) return;
    const chip = document.createElement('span');
    chip.className = 'tag-chip';
    chip.appendChild(document.createTextNode(label));
    const x = document.createElement('button');
    x.type = 'button';
    x.setAttribute('aria-label', 'Remove ' + label);
    x.textContent = '×';
    x.addEventListener('click', () => chip.remove());
    chip.appendChild(x);
    tagBox.insertBefore(chip, tagInput);
    tagInput.value = '';
  }
  function resetTags() {
    if (!tagBox) return;
    tagBox.querySelectorAll('.tag-chip').forEach((c) => c.remove());
    if (tagInput) tagInput.value = '';
  }
  if (tagInput) {
    tagInput.addEventListener('keydown', (e) => {
      if (e.key === 'Enter') {
        e.preventDefault();
        addTag(tagInput.value.trim());
      }
      if (e.key === 'Backspace' && !tagInput.value) {
        const chips = tagBox.querySelectorAll('.tag-chip');
        const last = chips[chips.length - 1];
        if (last) last.remove();
      }
    });
  }

document.querySelectorAll('[data-act]').forEach((btn) => {
    btn.addEventListener('click', (e) => {
      e.stopPropagation();
      const act = btn.getAttribute('data-act');
      if (act === 'tags') resetTags();
    });
  });
```

---

_Source: https://mighil.com/animations/tag-input_