# Writing UI documentation without screenshots

Bookhoard's UI documentation uses no screenshots. This page is the standard
for writing them. The flagship example of the style is the
[filter system documentation](../user/filters/index.md): one system taught
once, the places it appears listed as a *pattern*, samples for every field in
a [generated reference](../user/filters/fields.md) that cannot drift from the
UI.

## Why no screenshots

Screenshots fail in every way the rest of this repo's rot is already gated
against:

- **They rot silently.** No gate can diff pixels against the running UI. A
  renamed button makes the screenshot wrong and nothing fails.
- **They cannot be verified.** Shown text can: this app's UI is
  server-rendered from `templates/*.templ`, so every stable label and heading
  is a literal in the source — checkable, like routes and API examples are.
- **They die with a redesign.** Text keyed to *function* survives a
  re-layout. Text keyed to a layout dies with its redesign.
- **They exclude** (screen readers, text search) and bloat diffs.

The one thing screenshots do better — "which button is it?" — text does via
**exact quoted labels** plus a semantic path, and the label gate then holds
that text against the source.

## The layering — what is load-bearing

Write every UI page in this order. The top layers are why users don't get
lost when the UI changes:

| # | Layer | Content | Lifespan |
| --- | --- | --- | --- |
| 1 | **The pattern** | What the thing *is*, what is invariant, every place the same pattern appears | Redesign-proof |
| 2 | **Function inventory** | What the user *can do*, phrased without control names | Redesign-proof |
| 3 | **How-to with examples** | Numbered flows: current label → the outcome it produces | Survives most changes |
| 4 | **Current labels** | Exactly quoted, bold | Gate-checked today |
| 5 | **Generated references** | Enumerables regenerated from source with a currency test | Cannot drift |

Labels are **tips, not the map**. Layer 3 may quote a label; layer 1 must
make the page followable even if that label is renamed next week.

## The page template

1. **The pattern first.** The concept, its invariants, and everywhere it
   appears — "one system, three places". Never page cartography.
2. **Function inventory.** Capabilities without control names: "you can pin
   any narrowing to a named filter you can reopen later".
3. **How-to with examples.** Each step: the label of what you interact with,
   then the outcome ("the count at the bottom shows how many books will
   match"). An example beats an adjective.
4. **Findability note.** One line telling the reader how to re-locate the
   feature *by function again* after any UI change — deliberately
   label-independent ("it's the drawer opened from any books or podcasts
   list — the only place whose header can read Match ALL").
5. **Current labels.** Quoted exactly as rendered, one canonical spelling
   per control ([arbitrated by the glossary](ui-controls.md)).

## Writing rules

- **Semantic placement, never spatial.** No "top-right" or "at the bottom of
  the screen" talk. "Devices page → the **Register Device** button" survives
  any re-layout.
- **One canonical label per control.** Two spellings of the same control is
  a defect, not a synonym.
- **Status updates get a what-it-means table**, not a color description.
- **Screenshots are never load-bearing.** Default is none.

## Tone by audience

- **User Guide (`docs/user/`) — plain language, deliberately.** Short
  sentences. Everyday words. No developer jargon; any term the reader
  genuinely needs (say, *rule*) is explained once, in place, then used
  consistently. The reader is assumed to know books, while the app's own
  words are the only technical vocabulary allowed.
- **Developer and Administration sections — tone is a separate discussion,
  not yet decided.** Write them plainly and hand-off-rich as well; do not
  import opinions about their voice until that pass happens.

## Generate what has a registry

Anything enumerable gets generated from source with a currency test, not
hand-typed. The precedent: every filter field is
[generated](../user/filters/fields.md) by `TestFieldReferenceDocIsCurrent`
from the same registry the menus render — the doc cannot disagree with the
UI. Hand-typed lists drift fastest; when no registry exists yet, say so in
the page and lean on the pattern layers.

## The gates

- `TestUIControlLabels` (`internal/docs/ui_labels_test.go`): every control in
  the [glossary](ui-controls.md) must exist as a literal in
  `templates/*.templ` (or `web/src` for TS-rendered surfaces, marked
  `source: ts`). Renames fail `make test` in the same commit as the rename.
- `TestDocsRelativeLinks`: every relative link in the docs tree resolves to
  a real file.

Naming a new control in prose? Add its glossary entry in the same commit.
Form labels inside one modal (Name, Description…) are cited inline and not
glossary-tracked; the glossary carries the controls people navigate by —
buttons, tabs, badges, page titles.

## The process rule

**A UI change is not finished until the docs audit runs.** Moved card,
renamed button, restructured page — all of it triggers: labels still
resolve, links still resolve, affected pages re-read against the new
surface. The pattern layers keep users oriented between audits; the audit
keeps layers 3–5 honest.

## What this does not replace

The filter documentation (and the older filtering overview) is hands-off
exemplar territory — read it as the model, never restyle it here. New UI
surfaces (scanning, devices, settings, podcasts, the reader, collections)
are written this way from the start.