Field

Copy this

<div class="hm-stack hm-measure">
  <div class="form-field">
    <label class="form-label" for="hm-field-email">Billing email<span class="form-required">*</span></label>
    <input class="form-input" id="hm-field-email" type="email" required placeholder="you@company.com" aria-describedby="hm-field-email-hint">
    <p class="form-hint" id="hm-field-email-hint">Receipts and renewal notices go here.</p>
  </div>
  <div class="form-field">
    <label class="form-label" for="hm-field-slug">Workspace slug</label>
    <input class="form-input" id="hm-field-slug" value="Acme Corp" aria-invalid="true" aria-describedby="hm-field-slug-error">
    <p class="form-error" id="hm-field-slug-error">Use lowercase letters, numbers and hyphens only.</p>
  </div>
  <div class="form-field">
    <label class="form-label" for="hm-field-color">Brand colour</label>
    <div class="form-color-group" data-color-group><input class="form-color-input" id="hm-field-color" type="color" value="#3b82f6"><span class="form-color-hex">#3b82f6</span></div>
  </div>
</div>

Server exchange

This Hyperpart has no server exchange — it is presentation or client chrome only. htmx does not issue a request on this part's behalf. If you put an affordance (hx-*) on a control that uses this markup, that action's exchange belongs to the action, not this part. See Swap contract for host-owned envelopes.

Swap contract

Agent-visible HTMX topology (ADR-0054 / decision 0012). exchange envelope = what the response may re-emit relative to the persistent slot (body_only | outer | none | host_owned | document). dual-lock validates part markup only — not this envelope. Stem: stems/morph-safe-hypermedia.md; decision: docs/decisions/0012-swap-identity-contract.md.

No host HTMX exchange on this part — presentation or client chrome only. exchange envelope: n/a.

If a host wraps this markup in hx-*, that host owns the swap contract (sole identity + envelope). Prefer innerMorph / outerMorph for stable slots; replacement for flash; body-only responses under inner swaps.

Envelope response examples

This part has no owned exchange (envelope n/a). If a host adds hx-*, that host’s envelope applies — typically body_only:

<!-- Host wraps this presentation part with hx-* (host owns envelope) -->
<!-- Prefer: hx-swap="innerMorph" hx-target="#panel-body" -->
<!-- Server returns body_only interior for #panel-body -->
<div class="dz-stack">content…</div>

Do not re-own the slot:

<!-- WRONG: server returns the presentation root with a new id every poll -->
<div id="field-root" data-dz-region>…</div>

How to use it

No extended guidance authored yet — start from Copy this and the dependency chips (Primitive = markup only; controller = load listed JS; Endpoint = implement Server exchange).

Seams

• copy the partial under Copy this; keep root class and data-* modifiers so the CSS/JS bundle matches
• no Server exchange on this part — pure presentation or client chrome
• satisfy the DOM contract tables (CI stop-ship)

DOM contract

2 dual-lock modules for this part (contracts/form_field.py, contracts/color.py). Read top-to-bottom: core root first, then extensions. Each Exemplar render() live box is CI fixture output for that module — not a second demo of the whole Hyperpart. What the tables require is the emitted HTML; Python under contracts/ is package-internal dual-lock (not an app route). Request/response wiring: Server exchange.

contracts/form_field.py

Required in the DOM: root .form-field (part form-field). Emit only these attributes — inventing extras is fine only if controllers ignore them; omitting required ones fails CI (tests/test_contracts.py).

Module source

Import path is monorepo/package-local (from contracts._kit import …). Source-token form often uses data-*; gallery demos above are unprefixed. Do not copy this into app routes.

"""HYPERPART: form-field — plain form field wrapper.

Dual-lock unit is the field root. Label, input, help, and a11y attrs are
host-owned. Class ``.dz-form-field`` is the stable substrate root
(``_emit_field``). Distinct from specialized widgets (combobox/tags/…).
"""

from contracts._kit import DomContract, Node

DOM_CONTRACT = DomContract(
    part="form-field",
    root=".dz-form-field",
    nodes=(Node(".dz-form-field", attrs={}),),
)

__all__ = ["DOM_CONTRACT"]

contracts/color.py

Required in the DOM: root [data-color-group] (part color). Emit only these attributes — inventing extras is fine only if controllers ignore them; omitting required ones fails CI (tests/test_contracts.py).

Module source

Import path is monorepo/package-local (from contracts._kit import …). Source-token form often uses data-*; gallery demos above are unprefixed. Do not copy this into app routes.

"""HYPERPART: field (extension: dz-color) — colour input group."""

from contracts._kit import DomContract, Node

DOM_CONTRACT = DomContract(
    part="color",
    root="[data-dz-color-group]",
    nodes=(Node("[data-dz-color-group]", attrs={}),),
)

__all__ = ["DOM_CONTRACT"]

Notes

Source files

Canonical registration in the registry. No dedicated controller — CSS for this part lives in the layered bundle.

site/registry.py · contracts/form_field.py · contracts/color.py