Popover

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<details class="popover">
  <summary class="button" data-variant="outline">Details</summary>
  <div class="popover__panel">
    <div class="hm-demo-title">Dimensions</div>
    <p class="hm-demo-muted">Filters, previews, quick forms.</p>
  </div>
</details>

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="popover-root" data-dz-region>…</div>

How to use it

Seams

• `details.popover` + summary + `.popover__panel`
• data-dismiss / data-dismiss-ms — spatial vs temporal (stem overlay-light-dismiss)
• shared controller with menu (details-light-dismiss.js)

Do / Don't

Pitfalls

• not a modal dialog — no focus trap; use dialog when you need modal
• not a tooltip — do not put a default timeout on form/filter popovers
• native details do not Esc/outside-dismiss without the controller
• do not light-dismiss accordion/tree (in-flow structure)

Keyboard / AT

• Keyboard: Enter/Space on summary; Escape dismisses (if esc enabled)
• Touch: pointer outside dismisses (if outside enabled)

Related parts

button

DOM contract

What the emitted HTML must satisfy — the table is the required surface; Python under contracts/ is the package-internal dual-lock CI runs (tests/test_contracts.py), not an app route. Standalone HTMX4: implement the API so responses match this markup. Dazzle: the agent emits SSR that already satisfies it. Do not invent attrs outside these tables. For request/response wiring see Server exchange.

contracts/popover.py

Required in the DOM: root details.popover, .popover (part popover). 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: popover — details free-content panel (light-dismiss enhanced).

Optional instance attrs (controller reads; not required by DomContract):
  data-dz-dismiss, data-dz-dismiss-ms — see stems/overlay-light-dismiss.md
"""

from contracts._kit import DomContract, Node

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

__all__ = ["DOM_CONTRACT"]

Notes

Source files

One logical Hyperpart, 4 code items (CSS layered, JS bundled). Bound by HYPERPART: popover — python tools/hyperpart.py popover lists them.

site/registry.py · contracts/popover.py · components/hm-core.css:238 · controllers/dz-details-light-dismiss.js