# Field

Connect labels, descriptions, errors, and native controls. (CSS only.)

Reference: https://timeless.build/docs/components/field/

> **Markup you author.** One field is one label, one control, and whatever description or error belongs to it. `ui-input` and `ui-textarea` are the same field with a different control — both take `data-ui-size`, and the `<textarea>` keeps its own native resize handle.

## Markup

```html
<div class="ui-field">
  <label class="ui-label" for="email">Email</label>
  <div data-ui-part="control">
    <input class="ui-input" id="email" name="email" type="email" placeholder="you@example.com" aria-describedby="email-description">
    <p class="ui-description" id="email-description">Used for release notifications.</p>
  </div>
</div>
<div class="ui-field">
  <label class="ui-label" for="release-notes">Release notes</label>
  <div data-ui-part="control">
    <textarea class="ui-textarea" id="release-notes" name="notes" placeholder="What changed in this release?" aria-describedby="release-notes-description"></textarea>
    <p class="ui-description" id="release-notes-description">Shown on the release page.</p>
  </div>
</div>
```

## Install

```js
import '@timelessui/components/css/tokens.css'
import '@timelessui/components/css/core/forms.css'
import '@timelessui/components/css/themes/atmosphere/tokens.css'
import '@timelessui/components/css/themes/atmosphere/forms.css'
```

## Anatomy

Parts are authored in your own markup and identified by the selector below. Required parts
must be present for the component to work. Private `data-ui-internal-*` hooks are written by
the runtime and must never be authored.

**ui-field**

| Part | Required | Selector | Purpose |
| --- | --- | --- | --- |
| `control` | No | `[data-ui-part~='control']` | Wrapper around the native control when one is needed. |

## Attributes

Every value below is implemented by the stylesheets this component ships. Boolean attributes
are presence-based: author the attribute with no value, or omit it.

**ui-field**

| Attribute | Values | Default | Description |
| --- | --- | --- | --- |
| `data-ui-layout` | `stacked` · `inline` | `stacked` | Whether the label sits above the control or beside it. |
| `data-ui-density` | `compact` · `normal` · `spacious` | `normal` | Gap between label, control, description, and error. |

**ui-input**

| Attribute | Values | Default | Description |
| --- | --- | --- | --- |
| `data-ui-size` | `sm` · `md` · `lg` | `md` | Control height, padding, and font size. |

**ui-textarea**

| Attribute | Values | Default | Description |
| --- | --- | --- | --- |
| `data-ui-size` | `sm` · `md` · `lg` | `md` | Control height, padding, and font size. |

## State

Native attributes, ARIA, and platform pseudo-classes are authoritative. Style state through
the selectors below rather than adding your own state classes.

| State | Source | How to express it |
| --- | --- | --- |
| `invalid` | aria | Set `aria-invalid="true"` on the control and point `aria-describedby` at the error part. |
| `invalid` | native | Native `:invalid`, or `aria-invalid="true"`. |
| `disabled` | native | Native `disabled`. |

## Styling

Root identity: `ui-field`, `ui-label`, `ui-input`, `ui-textarea`, `ui-description`, `ui-error`.
Required stylesheets: `tokens.css`, `core/forms.css`, `themes/atmosphere/tokens.css`, `themes/atmosphere/forms.css`.

This component adds no custom properties of its own. Restyle it through the design tokens at https://timeless.build/docs/styling/theming/ or your own CSS.

Design tokens this component reads (26), global and set at the theme level: `--ui-accent`, `--ui-bg-control`, `--ui-bg-control-muted`, `--ui-bg-surface`, `--ui-bg-surface-subtle`, `--ui-danger`, `--ui-danger-soft`, `--ui-disabled-opacity`, `--ui-duration-fast`, `--ui-ease-standard`, `--ui-fg`, `--ui-fg-muted`, `--ui-fg-subtle`, `--ui-focus`, `--ui-line`, `--ui-line-strong`, `--ui-radius-md`, `--ui-radius-pill`, `--ui-radius-sm`, `--ui-shadow-control`, `--ui-shadow-inset`, `--ui-space-1`, `--ui-space-2`, `--ui-space-3`, `--ui-space-4`, `--ui-space-5`.

## Accessibility

Keep the native elements, roles, and relationships shown in the markup. Timeless adds only the
state and keyboard coordination the platform does not already provide, and it never supplies
your accessible names — those depend on your content.

This component declares no keyboard contract, because it has none of its own: the markup above
is native elements and native ARIA, and everything a keyboard or a screen reader does with it
comes from the platform. Nothing here manages focus, and nothing here adds a role you did not
author. So the accessibility of this component is the accessibility of the markup — which is why
the markup is the part worth copying exactly.

## Before JavaScript runs

This primitive is CSS only. There is nothing to register and nothing to wait for.