# コマ送りで読める漫画のEPUB

> 短い漫画を、PDF、コマ送りで読めるリージョンナビゲーション付きの固定レイアウトEPUB、Kindle Panel View付きEPUB、リフロー型EPUBに書き出します。

- HTML版: https://postext.dev/ja/cookbook/comic-epub-guided-view
- レシピ No. 148 · コミックと漫画 · 難易度 2 (中級) · 出力: Canvas, PDF, EPUB
- ジャンル: 漫画・コミック
- 必要なもの postext ≥ 1.21.0, postext-pdf ≥ 1.21.0 · テスト環境 1.21.0, postext-pdf 1.21.0 ／テスト日 2026-10-07
- ページ: [1](https://postext.dev/cookbook/comic-epub-guided-view/ja/p01.webp?v=f02b4641), [2](https://postext.dev/cookbook/comic-epub-guided-view/ja/p02.webp?v=f02b4641), [3](https://postext.dev/cookbook/comic-epub-guided-view/ja/p03.webp?v=f02b4641)
- PDF: https://postext.dev/cookbook/comic-epub-guided-view/ja/comic-epub-guided-view.pdf?v=f02b4641
- Sandboxで開く: https://postext.dev/ja/sandbox#recipe=comic-epub-guided-view&lang=ja (.postext: https://postext.dev/cookbook/comic-epub-guided-view/ja/comic-epub-guided-view.postext)
- 最終更新: 2026-10-07
- 他の言語: [en](https://postext.dev/en/cookbook/comic-epub-guided-view.md), [es](https://postext.dev/es/cookbook/comic-epub-guided-view.md), [ca](https://postext.dev/ca/cookbook/comic-epub-guided-view.md), [pt](https://postext.dev/pt/cookbook/comic-epub-guided-view.md), [zh](https://postext.dev/zh/cookbook/comic-epub-guided-view.md), [ar](https://postext.dev/ar/cookbook/comic-epub-guided-view.md)

## かんたんな説明

2ページの漫画を、印刷用のPDFと電子書籍にします。ページをそのまま保ってコマごとに拡大できるもの、Kindle向けのもの、せりふを文字にしたものです。

## できあがり

『ポースコーヴの灯』の第一話です。扉と漫画2ページを一度だけ組み、4通りに書き出します。PDFは印刷用。固定レイアウトのEPUBは印刷ページをそのまま保ち、リージョンナビゲーションを持つので、読書アプリは灯台に着くコマからラジオ、そしてマヤへと、一コマずつ拡大して見せられます。二つ目の固定EPUBにはKindle Panel Viewを加え、リフロー版は各コマを切り抜いた絵とそのせりふで組みます。ページには、読書アプリで開いたときの各ファイルの中身とダウンロードのリンクを並べます。六言語で出ます。

**このレシピが答える問い:**

- 読者がコマ送りで読める漫画のEPUBを書き出すには？

## 手短な答え

```js
// script.js, 行 244–259
// The fixed layout keeps every printed page and writes regions.xhtml (EPUB Region-Based
// Navigation): one panel region per panel in reading order, its balloons nested in it.
// kindlePanelView adds Kindle's tap-to-magnify targets; the reflowable book sets each panel
// as its cropped picture followed by its lines as text.
const book = {
  metadata: { title: doc.metadata.title, creators: [doc.metadata.author], language: config().locale,
    modified: new Date('2026-10-07T00:00:00Z') }, // a fixed date: the same bytes on every run
  fonts: await epubFonts([LETTERING, SFX], markdown), // every face the pages set, as bytes
  resourceBytes: (fileId) => ({ bytes: imageBytes(fileId), mediaType: 'image/jpeg' }),
  onWarning: (w) => console.warn(`[epub] ${w.kind}`, w.family ?? w.fileId ?? w.detail),
};
const epubs = {
  fixed: await renderToEpub(doc, { ...book, layout: 'fixed' }),
  kindle: await renderToEpub(doc, { ...book, layout: 'fixed', kindlePanelView: true }),
  reflowable: await renderToEpub(doc, { ...book, layout: 'reflowable' }),
};
```

## 材料

**学べること**

- [PDFとEPUBの漫画](https://postext.dev/ja/docs/comics.md#漫画の出力): 漫画のページは他のページと同じように書き出せます。PDFでは吹き出しと写植がベクターになり、固定レイアウトのEPUBでは領域ナビゲーションでコマを1つずつ追えます。
- [EPUBの書き出し](https://postext.dev/ja/docs/configuration.md#epubの本postext-epub): postext-epubのrenderToEpubは、レイアウト済みの章をブラウザー内でEPUB 3ファイルとして書き出します。印刷したすべてのページを保つ固定レイアウトか、同じ設定からスタイルを付けたリフロー型のテキストを選べます。

**ほかに使うもの**

- [コマ割り](https://postext.dev/ja/docs/comics.md#ページの分割)
- [コマの絵とトリミング](https://postext.dev/ja/docs/comics.md#コマと絵)
- [漫画のページ](https://postext.dev/ja/docs/comics.md#漫画のページ)
- [漫画の写植](https://postext.dev/ja/docs/comics.md#写植)
- [他言語への写植し直し](https://postext.dev/ja/docs/comics.md#写植)
- [話者とアンカー](https://postext.dev/ja/docs/comics.md#話者とアンカー)
- [吹き出しのスタイル](https://postext.dev/ja/docs/comics.md#吹き出しのスタイル)
- [画像のセーフエリア](https://postext.dev/ja/docs/document-format.md#セーフエリア)
- [セマンティックカラーパレット](https://postext.dev/ja/docs/configuration.md#カラーパレット)
- [キャンバス上のページ](https://postext.dev/ja/docs/configuration.md#ページをビットマップに描画する)
- [PDFの書き出し](https://postext.dev/ja/docs/configuration.md#pdfの生成)
- [中国語の改行](https://postext.dev/ja/docs/configuration.md#東アジアの組版)
- [コマの枠線と間白](https://postext.dev/ja/docs/comics.md#コマと絵)
- [用紙の色](https://postext.dev/ja/docs/configuration.md#ページ)
- [ページの役割ごとの柱](https://postext.dev/ja/docs/configuration.md#テキスト要素)
- [段落スタイル](https://postext.dev/ja/docs/configuration.md#段落スタイル)
- [PDFに埋め込むフォント](https://postext.dev/ja/docs/configuration.md#なぜフォントプロバイダーが必要か)
- [リソースとしての図と表](https://postext.dev/ja/docs/document-format.md#リソース)
- [右綴じの本](https://postext.dev/ja/docs/configuration.md#綴じ)
- [描き文字の擬音](https://postext.dev/ja/docs/comics.md#吹き出しのスタイル)

**設定の一覧**

- [`bodyText`](https://postext.dev/ja/docs/configuration.md#本文), [`colorPalette`](https://postext.dev/ja/docs/configuration.md#カラーパレット), [`comics`](https://postext.dev/ja/docs/comics.md#漫画のページ), [`footer`](https://postext.dev/ja/docs/configuration.md#柱とノンブル), [`header`](https://postext.dev/ja/docs/configuration.md#柱とノンブル), [`headings`](https://postext.dev/ja/docs/configuration.md#見出し), [`layout`](https://postext.dev/ja/docs/configuration.md#レイアウト), [`locale`](https://postext.dev/ja/docs/configuration.md#ハイフネーション), [`page`](https://postext.dev/ja/docs/configuration.md#ページ), [`paragraphStyles`](https://postext.dev/ja/docs/configuration.md#段落スタイル)

**API**

- [`buildDocument`](https://postext.dev/ja/docs/configuration.md#文書のビルド), [`clearMeasurementCache`](https://postext.dev/ja/docs/configuration.md#計測キャッシュ), [`decompressWoff2`](https://postext.dev/ja/docs/configuration.md#ブラウザー向けフォントプロバイダーfontsource--woff2), `loadVerticalAlternates`, [`readEpub`](https://postext.dev/ja/docs/configuration.md#本を書き出す), [`registerResourceImage`](https://postext.dev/ja/docs/architecture.md#apiの概要), [`renderPageToCanvas`](https://postext.dev/ja/docs/configuration.md#ページをビットマップに描画する), [`renderToEpub`](https://postext.dev/ja/docs/configuration.md#本を書き出す), [`renderToPdf`](https://postext.dev/ja/docs/configuration.md#pdfの生成)

**書体**

- Comic Neue (OFL-1.1), Bangers (OFL-1.1), Zen Antique (OFL-1.1), Dela Gothic One (OFL-1.1), ZCOOL KuaiLe (OFL-1.1), ZCOOL QingKe HuangYou (OFL-1.1), Playpen Sans Arabic (OFL-1.1), Lalezar (OFL-1.1)

## 作り方

### 1 · 同じ文書をEPUBに書き出す

コードは前の[手短な答え](https://postext.dev/ja/cookbook/comic-epub-guided-view.md#手短な答え)にあります。`renderToEpub`は`renderToPdf`が印刷する文書を受け取るので、EPUBのページはPDFのページと同じです（[漫画の出力](https://postext.dev/ja/docs/comics.md#漫画の出力)）。`layout: 'fixed'`で本に漫画のページがあると、`regions.xhtml`も書きます。読む順にコマごとの`panel`領域があり、それぞれページに対する百分率の矩形で、中に吹き出し、ナレーション、描き文字の領域が入れ子になります。ページ送りの向きは漫画の読む方向に従うので、日本語版とアラビア語版は右から左へめくります。`kindlePanelView: true`は、コマごとのタップ領域と拡大したコピー、Kindleが求めるメタデータを加えます。リフロー版には保つべきページがないので、各コマはページと同じに切り抜いた絵と、その後のせりふ「**マヤ**：ビスケット！　おじいちゃんは？」になります。名前は`comics.cast`から取ります。

![2ページ。. 2ページ。長いナレーションとともに灯台に着くマヤ、ラジオの前の灯台守、床を指さすマヤ。](https://postext.dev/cookbook/comic-epub-guided-view/ja/p02.webp?v=f02b4641)

*2ページの1コマ目。ガイドビューの最初の領域で、ナレーションとマヤの吹き出しが入れ子になっています。*

### 2 · ページが使う書体を埋め込む

```js
// script.js, 行 193–222
// For each weight and style the lettering asks for, the file loadComicFonts chose (the
// nearest one Fontsource ships), only the slices whose characters the book sets. A file that
// serves several weights is embedded once, with a weight range ('400 700').
const inRange = (range, cp) => range.split(',').some((part) => {
  const [lo, hi = lo] = part.trim().slice(2).split('-');
  return cp >= parseInt(lo, 16) && cp <= parseInt(hi, 16);
});
async function epubFonts(families, text) {
  const cps = [...new Set(text)].map((ch) => ch.codePointAt(0));
  const byFile = new Map(); // url → the face it serves
  for (const family of families) {
    const meta = await fontsourceMeta(family);
    const asks = [[400, 'normal'], [700, 'normal'], [400, 'italic'], [700, 'italic']];
    for (const [weight, style] of asks) {
      const w = meta.weights.reduce((a, b) => (Math.abs(b - weight) < Math.abs(a - weight) ? b : a),
        400);
      const s = style === 'italic' && meta.styles.includes('italic') ? 'italic' : 'normal';
      for (const { url, range } of await comicFaceFiles(family, w, s, meta, text)) {
        if (range && !cps.some((cp) => inRange(range, cp))) continue;
        const face = byFile.get(url) ?? { family, style: s, weights: new Set(), range };
        face.weights.add(weight);
        byFile.set(url, face);
      }
    }
  }
  return Promise.all([...byFile].map(async ([url, { family, style, weights, range }]) => ({
    family, style, format: 'woff2', unicodeRange: range,
    weight: weights.size > 1 ? `${Math.min(...weights)} ${Math.max(...weights)}` : [...weights][0],
    bytes: new Uint8Array(await (await fetch(url)).arrayBuffer()) })));
}
```

固定レイアウトのEPUBは、自分が持っている書体で文字を描きます。足りない書体は読書アプリの書体に置き換わります。写植はレギュラー、ボールド、イタリックを求めますが、漫画用の書体はそれより少ない数しかないので、それぞれ`loadComicFonts`が選んだファイルを使い、二つのウエイトに使うファイルは`'400 700'`という範囲で一度だけ入れます。日本語と中国語の書体は、その版が使う文字を含む分割ファイルだけを入れるので、日本語版は1.4 MBに収まります。

### 3 · 各ファイルを読み戻す

```js
// script.js, 行 263–284
const el = (tag, css, text) => Object.assign(document.createElement(tag),
  { textContent: text ?? '' }, { style: css });
const shelf = el('section', 'display: flex; flex-wrap: wrap; gap: 16px; justify-content: center;'
  + 'padding: 24px 16px 0; color: #d9d5cc; font: 13px/1.5 system-ui, sans-serif');
for (const [name, bytes] of Object.entries(epubs)) {
  const epub = readEpub(bytes);
  const regions = new TextDecoder().decode(epub.files.get(`${epub.root}regions.xhtml`)
    ?? new Uint8Array());
  const panels = regions.split('<li epub:type="panel">').slice(1); // one per panel
  const card = el('article', 'width: min(300px, 92vw); padding: 16px; border: 1px solid #2c3038');
  const steps = el('ol', 'margin: 8px 0; padding-left: 22px');
  steps.append(...panels.map((p, i) => el('li', '', `panel ${i + 1}: ${(p.match(
    /epub:type="(balloon|caption|sound-area|text-area)"/g) ?? []).length} text regions`)));
  const link = Object.assign(el('a', 'color: #d8a21a', `Download ${RECIPE}-${name}.epub`), {
    href: URL.createObjectURL(new Blob([bytes])), download: `${RECIPE}-${name}.epub` });
  card.append(el('h2', 'margin: 0; font-size: 15px; color: #f4f1ea', `EPUB 3 · ${name}`),
    el('p', 'margin: 4px 0 0', `${epub.layout} · ${epub.pageProgression} · `
      + `${epub.spine.length} documents · ${Math.round(bytes.length / 1024)} KB`),
    panels.length ? steps : el('p', '', 'No region navigation: the panels are text.'), link);
  shelf.append(card);
}
document.getElementById('pages').before(shelf);
```

`readEpub`は読書アプリと同じようにバイト列を開きます。レイアウト、ページ送りの向き、スパインです。各カードのリストは`regions.xhtml`から読んだガイドビューそのもので、五つのコマとその文字の領域が、読者がたどる順に並びます。三つのファイルは英語、日本語、アラビア語でEPUBCheck 5.4をエラーも警告もなく通ります。

### 4 · 一つのレイアウトで六つの版

```js
// script.js, 行 37–41
const [LETTERING, SFX] = t({
  en: ['Comic Neue', 'Bangers'], es: ['Comic Neue', 'Bangers'], ca: ['Comic Neue', 'Bangers'],
  ja: ['Zen Antique', 'Dela Gothic One'], zh: ['ZCOOL KuaiLe', 'ZCOOL QingKe HuangYou'],
  ar: ['Playpen Sans Arabic', 'Lalezar'], pt: ['Comic Neue', 'Bangers'],
});
```

`content.<lang>.md`には、同じ話者IDで一つの版の言葉を書きます。コマの領域はどの言語でも同じで、吹き出しの領域は、各言語の文字に合わせて写植し直された吹き出しとともに動きます。

## レシピの全体

レシピのフォルダーから合成した1つのファイルで、サンプルのテキストとレシピ集の共通キットを埋め込んであり、自分でページを組み立てます。動かすには、空のページの`<script type="module">`に入れるか、新しいCodePenのpenのJSパネルに貼り付けます（モジュールとして）。esm.shからpostextを読み込むので、インストールもビルドも要りません。

- レシピのフォルダー: https://github.com/drnachio/postext/tree/main/cookbook/comic-epub-guided-view

### script.js

```js
// ═══ Postext Cookbook · Nº 148 · A comic EPUB read panel by panel ═══════════════════
// https://postext.dev/en/cookbook/comic-epub-guided-view
// Code: MIT · Text: original (CC BY 4.0) · Pictures: generated with diffusion models
// Fonts: Comic Neue, Bangers and the faces of five editions (OFL) · Needs postext ≥ 1.21.0
//
// A short comic laid out once and exported four ways: a PDF for print, a fixed-layout EPUB
// whose region-based navigation lets a reading system step through it panel by panel, the
// same EPUB with Kindle Panel View, and a reflowable EPUB with each panel's lines as text.
// Each file is read back to list what a reader will find in it.
import {
  buildDocument, renderPageToCanvas, clearMeasurementCache, registerResourceImage,
  loadVerticalAlternates,
} from 'https://esm.sh/postext';
import { renderToPdf, decompressWoff2 } from 'https://esm.sh/postext-pdf';
import { renderToEpub, readEpub } from 'https://esm.sh/postext-epub';

const LANG = 'ja'; // @lang: the sample's language ('en' | 'es' | 'ca' | 'zh' | 'ar' | 'ja' | 'pt')
const RECIPE = 'comic-epub-guided-view';

// ─── 1 · Design ─────────────────────────────────────────────────────────────
// #region palette: the night sea, the lighthouse red and the yellow of the captions
const palette = {
  ink: '#1b2430', // panel borders, lettering and the title page
  accent: '#b8322a', // the lighthouse red: title and sound effects
  caption: '#f4e7bf', // caption boxes
  muted: '#5f6873', // folios and the imprint
  paper: '#fdfbf6',
};
const col = (id) => ({ hex: palette[id], model: 'hex', paletteId: id });
const colorPalette = [
  ...Object.entries(palette).map(([id, hex]) => ({ id, name: id, value: { hex, model: 'hex' } })),
  { id: 'main-color', name: 'accent (defaults)', value: { hex: palette.accent, model: 'hex' } },
];
// #endregion

// #region editions: six editions, each lettered in faces for its script
const [LETTERING, SFX] = t({
  en: ['Comic Neue', 'Bangers'], es: ['Comic Neue', 'Bangers'], ca: ['Comic Neue', 'Bangers'],
  ja: ['Zen Antique', 'Dela Gothic One'], zh: ['ZCOOL KuaiLe', 'ZCOOL QingKe HuangYou'],
  ar: ['Playpen Sans Arabic', 'Lalezar'], pt: ['Comic Neue', 'Bangers'],
});
// #endregion

const comics = {
  gutter: { horizontal: mm(4), vertical: mm(3) },
  panel: { borderWidth: pt(1), borderColor: col('ink'), background: col('paper') },
  lettering: { fontFamily: LETTERING, fontSize: pt(8), color: col('ink'), inset: mm(1.5) },
  balloonStyles: [{ id: 'speech', stroke: col('ink') }, { id: 'caption', fill: col('caption'),
    stroke: col('ink') }, { id: 'sfx', fontFamily: SFX, color: col('accent') }],
  // The names the reflowable EPUB prints before each line ("Maya: …").
  cast: [{ id: 'maya', name: 'Maya' }, { id: 'tomas', name: t({ en: 'Tomás', es: 'Tomás',
    ca: 'Tomàs', zh: '托马斯', ar: 'توماس', ja: 'トマス', pt: 'Tomás' }) }],
  runningHeads: true, // the folio on every comic page
};
const footer = { elements: [{ kind: 'text', id: 'folio', content: '{pageNumber}', pages: 'comic',
  fontFamily: LETTERING, fontSize: pt(7.5), color: col('muted'), align: 'center',
  placement: { anchor: { to: 'page', edge: 'bottom' }, offset: { x: mm(0), y: mm(-8) } } }] };

const config = () => ({ // a factory: the engine caches resolved configs per object
  locale: t({ en: 'en-gb', es: 'es', ca: 'ca', ja: 'ja', zh: 'zh-Hans', ar: 'ar', pt: 'pt-BR' }),
  colorPalette, comics,
  // The trim of an American comic book, 6⅝ × 10³⁄₁₆ in.
  page: { sizePreset: 'custom', width: mm(168), height: mm(259), dpi: 150,
    backgroundColor: col('paper'),
    margins: { top: mm(14), bottom: mm(18), left: mm(13), right: mm(11), mirror: true } },
  layout: { layoutType: 'single' },
  bodyText: { fontFamily: LETTERING, fontSize: pt(10.5), lineHeight: pt(15), color: col('ink'),
    boldColor: col('ink'), italicColor: col('ink'), referenceColor: col('ink'), textAlign: 'left',
    firstLineIndent: pt(0), paragraphSpacing: true, hyphenation: { enabled: false } },
  headings: { fontFamily: SFX, color: col('accent'), fontWeight: 400,
    levels: [
      // Restated: any headings object drops the H1 break (gotcha: headings-drop-h1-break).
      { level: 1, fontSize: pt(44), lineHeight: pt(48), breakBefore: { enabled: true,
        parity: 'any' }, marginTop: mm(60), marginBottom: pt(15) },
      { level: 2, fontFamily: LETTERING, fontSize: pt(14), fontWeight: 700, color: col('ink'),
        marginTop: pt(0), marginBottom: pt(15) },
    ] },
  paragraphStyles: [{ id: 'imprint', fontSize: pt(7.5), lineHeight: pt(10), color: col('muted'),
    marginTop: mm(90) }], header: { elements: [] }, footer,
});

// ─── 2 · Content ────────────────────────────────────────────────────────────
const markdown = String.raw`---
title: "ポースコーヴの灯"
author: "Postextクックブック"
---

# ポースコーヴの灯

## 第一話　コード

:::paragraphs{style="imprint"}
Postextクックブックのための原作と写植。絵は拡散モデルで生成。写植書体はZen AntiqueとDela Gothic One（SIL OFL）。
:::

:::page{split="45 / * [50 | *]"}
::panel{art=lh-arrive}
caption: 八月の最後の週。フェリーは遅れ、坂道は急で、猫が迎えに下りてきていた。
maya: ビスケット！　おじいちゃんは？
::panel{art=lh-radio}
tomas: ほら、ぽんこつ。何か言え。
::panel{art=lh-maya}
maya: おじいちゃん？　ラジオのコード、机の下を通ってるよね？
:::

:::page{split="55 / *"}
::panel{art=lh-biscuit}
sfx{rotate=-6}: ゴロゴロ
maya{whisper}: 見つけた。
::panel{art=lh-beam}
caption: 九時、ラジオはまたしゃべりだした。西から強風、小舟は出るな。
tomas: 灯はともった。今夜は誰も海に出ない。
maya: 猫は別。階段ですねてる。
:::
`; // content.<lang>.md, inlined by the Cookbook

// #region art: the five pictures of Nº 144, with the same safe areas and anchors
const face = (x, y, width, height) => ({ x, y, width, height });
const ART = {
  'lh-arrive': { width: 1100, height: 733, safeArea: face(0.22, 0.08, 0.4, 0.64),
    anchors: [{ id: 'maya', x: 0.29, y: 0.52, face: face(0.22, 0.42, 0.12, 0.16) },
      { id: 'biscuit', x: 0.4, y: 0.68, face: face(0.37, 0.64, 0.07, 0.08) }],
    avoid: [face(0.51, 0.09, 0.1, 0.43)] },
  'lh-radio': { width: 1000, height: 1000, safeArea: face(0.11, 0.36, 0.36, 0.31),
    anchors: [{ id: 'tomas', x: 0.345, y: 0.52, face: face(0.29, 0.4, 0.16, 0.18) }],
    avoid: [face(0, 0.44, 0.22, 0.26)] },
  'lh-maya': { width: 1100, height: 1100, safeArea: face(0.25, 0.27, 0.41, 0.68),
    anchors: [{ id: 'maya', x: 0.54, y: 0.565, face: face(0.4, 0.33, 0.24, 0.29) }],
    avoid: [face(0.27, 0.73, 0.25, 0.22)] },
  'lh-biscuit': { width: 1000, height: 1000, safeArea: face(0.58, 0.25, 0.42, 0.33),
    anchors: [{ id: 'biscuit', x: 0.72, y: 0.355, face: face(0.64, 0.27, 0.2, 0.18) }],
    avoid: [face(0.93, 0.28, 0.07, 0.24), face(0, 0.72, 0.4, 0.1)] },
  'lh-beam': { width: 1200, height: 800, safeArea: face(0.15, 0.01, 0.25, 0.3),
    anchors: [{ id: 'maya', x: 0.235, y: 0.15, face: face(0.21, 0.11, 0.05, 0.07) },
      { id: 'tomas', x: 0.3, y: 0.145, face: face(0.28, 0.11, 0.04, 0.06) }],
    avoid: [face(0.79, 0.55, 0.08, 0.09)] },
};
const ALT = {
  'lh-arrive': t({ en: 'Maya walks up the coastal path to the lighthouse, the cat ahead of her.',
    es: 'Maya sube por el camino de la costa hacia el faro, con el gato delante.',
    ca: 'La Maya puja pel camí de la costa cap al far, amb el gat al davant.',
    zh: '玛雅沿着海边小路走向灯塔，猫走在她前面。',
    ar: 'مايا تصعد الدرب الساحلي إلى المنارة والقط أمامها.',
    ja: 'マヤが海辺の小道を灯台へのぼっていく。前を猫が歩く。',
    pt: 'Maya sobe a trilha da costa até o farol, com o gato na frente.' }),
  'lh-radio': t({ en: 'The old keeper taps his valve radio, microphone in hand.',
    es: 'El viejo farero golpea su radio de válvulas con el micrófono en la mano.',
    ca: 'El vell faroner pica la ràdio de vàlvules amb el micròfon a la mà.',
    zh: '老守塔人手握话筒，敲着他的电子管收音机。',
    ar: 'الحارس العجوز ينقر على مذياعه القديم والميكروفون في يده.',
    ja: '老灯台守がマイクを握り、真空管ラジオをたたく。',
    pt: 'O velho faroleiro dá umas batidinhas no rádio valvulado, com o microfone na mão.' }),
  'lh-maya': t({ en: 'Maya frowns at the floor and points down.',
    es: 'Maya frunce el ceño mirando al suelo y señala hacia abajo.',
    ca: 'La Maya arrufa les celles mirant a terra i assenyala avall.',
    zh: '玛雅皱着眉看着地板，手指向下。',
    ar: 'مايا تعقد حاجبيها ناظرةً إلى الأرض وتشير إلى أسفل.',
    ja: 'マヤが眉をひそめて床を見つめ、下を指さす。',
    pt: 'Maya franze a testa olhando para o chão e aponta para baixo.' }),
  'lh-biscuit': t({ en: 'The fat orange cat sleeps on his back on the radio cable.',
    es: 'El gato naranja gordo duerme panza arriba sobre el cable de la radio.',
    ca: 'El gat taronja gras dorm panxa enlaire sobre el cable de la ràdio.',
    zh: '胖橘猫四脚朝天睡在收音机的电线上。',
    ar: 'القط البرتقالي السمين نائم على ظهره فوق سلك المذياع.',
    ja: '太ったオレンジ色の猫が、ラジオのコードの上であおむけに眠っている。',
    pt: 'O gato laranja gordo dorme de barriga para cima sobre o cabo do rádio.' }),
  'lh-beam': t({ en: 'Night: the beam sweeps the sea; Maya and her grandfather stand on the '
      + 'gallery.',
    es: 'De noche, el haz barre el mar; Maya y su abuelo están en la galería.',
    ca: 'De nit, el feix escombra el mar; la Maya i el seu avi són a la galeria.',
    zh: '夜里，光束扫过海面；玛雅和外公站在回廊上。',
    ar: 'ليلًا يمسح الشعاع البحر، ومايا وجدّها على الشرفة.',
    ja: '夜。光の帯が海をなでる。マヤと祖父が回廊に立つ。',
    pt: 'À noite, o facho varre o mar; Maya e o avô estão na galeria.' }),
};
// #endregion

// ─── 3 · Fonts ──────────────────────────────────────────────────────────────
// Every face of the six editions; each edition loads the latin files of all of them and the
// Japanese, Chinese or Arabic files of its own two (gotcha: fonts-first).
const FONTS = {
  'Comic Neue': ['400', '400i', '700', '700i'],
  Bangers: ['400'],
  'Zen Antique': ['400'],
  'Dela Gothic One': ['400'],
  'ZCOOL KuaiLe': ['400'],
  'ZCOOL QingKe HuangYou': ['400'],
  'Playpen Sans Arabic': ['400', '700'],
  Lalezar: ['400'],
};

// #region embed: the files the pages use, as the EPUB's font files
// For each weight and style the lettering asks for, the file loadComicFonts chose (the
// nearest one Fontsource ships), only the slices whose characters the book sets. A file that
// serves several weights is embedded once, with a weight range ('400 700').
const inRange = (range, cp) => range.split(',').some((part) => {
  const [lo, hi = lo] = part.trim().slice(2).split('-');
  return cp >= parseInt(lo, 16) && cp <= parseInt(hi, 16);
});
async function epubFonts(families, text) {
  const cps = [...new Set(text)].map((ch) => ch.codePointAt(0));
  const byFile = new Map(); // url → the face it serves
  for (const family of families) {
    const meta = await fontsourceMeta(family);
    const asks = [[400, 'normal'], [700, 'normal'], [400, 'italic'], [700, 'italic']];
    for (const [weight, style] of asks) {
      const w = meta.weights.reduce((a, b) => (Math.abs(b - weight) < Math.abs(a - weight) ? b : a),
        400);
      const s = style === 'italic' && meta.styles.includes('italic') ? 'italic' : 'normal';
      for (const { url, range } of await comicFaceFiles(family, w, s, meta, text)) {
        if (range && !cps.some((cp) => inRange(range, cp))) continue;
        const face = byFile.get(url) ?? { family, style: s, weights: new Set(), range };
        face.weights.add(weight);
        byFile.set(url, face);
      }
    }
  }
  return Promise.all([...byFile].map(async ([url, { family, style, weights, range }]) => ({
    family, style, format: 'woff2', unicodeRange: range,
    weight: weights.size > 1 ? `${Math.min(...weights)} ${Math.max(...weights)}` : [...weights][0],
    bytes: new Uint8Array(await (await fetch(url)).arrayBuffer()) })));
}
// #endregion

// ─── 4 · Build & show ───────────────────────────────────────────────────────
const faces = { [LETTERING]: FONTS[LETTERING], [SFX]: FONTS[SFX] };
await loadFonts(FONTS, markdown);
await loadCjkFonts(faces, markdown, { vertical: LANG === 'ja' }); // ja balloons are vertical
await loadArabicFonts(faces, markdown);
await loadComicFonts(faces, markdown); // the bold and italic the faces do not ship
const panel = (id, url) => comicPanel(id, url, { ...ART[id], alt: ALT[id] });
const resources = await Promise.all([
  panel('lh-arrive', asset('lh-arrive.jpg')), panel('lh-radio', asset('lh-radio.jpg')),
  panel('lh-maya', asset('lh-maya.jpg')), panel('lh-biscuit', asset('lh-biscuit.jpg')),
  panel('lh-beam', asset('lh-beam.jpg')),
]);
const doc = await buildWithFonts(() => buildDocument({ markdown, resources }, config()), markdown);
showBook(doc, { title: t({ en: 'A comic EPUB read panel by panel',
  es: 'Un EPUB de cómic que se lee viñeta a viñeta', pt: 'Um EPUB de HQ lido quadro a quadro' }) });
offerPdf(() => renderToPdf(doc, { fontProvider: comicPdfProvider, resourceBytes: imageBytes }),
  `${RECIPE}.pdf`);

// #region answer: the same document as a fixed EPUB with regions, for Kindle, and reflowable
// The fixed layout keeps every printed page and writes regions.xhtml (EPUB Region-Based
// Navigation): one panel region per panel in reading order, its balloons nested in it.
// kindlePanelView adds Kindle's tap-to-magnify targets; the reflowable book sets each panel
// as its cropped picture followed by its lines as text.
const book = {
  metadata: { title: doc.metadata.title, creators: [doc.metadata.author], language: config().locale,
    modified: new Date('2026-10-07T00:00:00Z') }, // a fixed date: the same bytes on every run
  fonts: await epubFonts([LETTERING, SFX], markdown), // every face the pages set, as bytes
  resourceBytes: (fileId) => ({ bytes: imageBytes(fileId), mediaType: 'image/jpeg' }),
  onWarning: (w) => console.warn(`[epub] ${w.kind}`, w.family ?? w.fileId ?? w.detail),
};
const epubs = {
  fixed: await renderToEpub(doc, { ...book, layout: 'fixed' }),
  kindle: await renderToEpub(doc, { ...book, layout: 'fixed', kindlePanelView: true }),
  reflowable: await renderToEpub(doc, { ...book, layout: 'reflowable' }),
};
// #endregion

// #region shelf: each file read back, with the guided view a reading system will follow
const el = (tag, css, text) => Object.assign(document.createElement(tag),
  { textContent: text ?? '' }, { style: css });
const shelf = el('section', 'display: flex; flex-wrap: wrap; gap: 16px; justify-content: center;'
  + 'padding: 24px 16px 0; color: #d9d5cc; font: 13px/1.5 system-ui, sans-serif');
for (const [name, bytes] of Object.entries(epubs)) {
  const epub = readEpub(bytes);
  const regions = new TextDecoder().decode(epub.files.get(`${epub.root}regions.xhtml`)
    ?? new Uint8Array());
  const panels = regions.split('<li epub:type="panel">').slice(1); // one per panel
  const card = el('article', 'width: min(300px, 92vw); padding: 16px; border: 1px solid #2c3038');
  const steps = el('ol', 'margin: 8px 0; padding-left: 22px');
  steps.append(...panels.map((p, i) => el('li', '', `panel ${i + 1}: ${(p.match(
    /epub:type="(balloon|caption|sound-area|text-area)"/g) ?? []).length} text regions`)));
  const link = Object.assign(el('a', 'color: #d8a21a', `Download ${RECIPE}-${name}.epub`), {
    href: URL.createObjectURL(new Blob([bytes])), download: `${RECIPE}-${name}.epub` });
  card.append(el('h2', 'margin: 0; font-size: 15px; color: #f4f1ea', `EPUB 3 · ${name}`),
    el('p', 'margin: 4px 0 0', `${epub.layout} · ${epub.pageProgression} · `
      + `${epub.spine.length} documents · ${Math.round(bytes.length / 1024)} KB`),
    panels.length ? steps : el('p', '', 'No region navigation: the panels are text.'), link);
  shelf.append(card);
}
document.getElementById('pages').before(shelf);
// #endregion

// ─── Kit ── helpers shared by every Cookbook recipe · postext.dev/cookbook ─────

// ─── Kit · core v1 ── the same in every recipe · postext.dev/cookbook
function mm(value) { return { value, unit: 'mm' }; }
function pt(value) { return { value, unit: 'pt' }; }
function em(value) { return { value, unit: 'em' }; }
/** The sample language's string: t({ en: 'Figure', es: 'Figura' }). */
function t(strings) { return strings[LANG] ?? Object.values(strings)[0]; }
/** A file in this recipe's assets folder, served from the Postext repo by jsDelivr. */
function asset(file) { return `https://cdn.jsdelivr.net/gh/drnachio/postext@main/cookbook/${RECIPE}/assets/${file}`; }

// ─── Kit · fonts v2 ── the same in every recipe · postext.dev/cookbook
// Postext measures with the loaded faces and caches the widths: load every face
// before the first build, from Fontsource, the files the PDF embeds too.

/** faces = { 'Family Name': ['400', '400i', '700'] }. `text` is the sample:
 *  č ł † α χ also load latin-ext and greek files (kitSubsetsFor). With
 *  `optional`, a face Fontsource does not ship is skipped instead of failing.
 *  Resolves to the number of faces added. */
async function loadFonts(faces, text = '', { optional = false } = {}) {
  kitStatus('Loading fonts…');
  const ranges = {
    latin: 'U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,'
      + 'U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD',
    'latin-ext': 'U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,'
      + 'U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF',
    greek: 'U+0370-03FF',
  };
  const jobs = [];
  let added = 0;
  for (const [family, specs] of Object.entries(faces)) {
    const id = fontsourceId(family);
    const todo = [...new Set(specs)].map((spec) => [parseInt(spec, 10), spec.endsWith('i') ? 'italic' : 'normal'])
      .filter(([weight, style]) => !hasFace(family, weight, style)); // before any await
    const meta = optional || /[^\0-ÿ]/u.test(text) ? await fontsourceMeta(family) : null;
    const subsets = ['latin', ...kitSubsetsFor(text, meta)];
    for (const [weight, style] of todo) {
      if (optional && !(meta?.weights.includes(weight) && meta.styles.includes(style))) continue;
      for (const subset of subsets) {
        const url = `https://cdn.jsdelivr.net/npm/@fontsource/${id}@5/files/${id}-${subset}-${weight}-${style}.woff2`;
        const face = new FontFace(family, `url(${url}) format('woff2')`,
          { weight: String(weight), style, unicodeRange: ranges[subset] });
        jobs.push(face.load().then((ready) => { document.fonts.add(ready); added++; }, () => {
          if (subset === 'latin' && !optional) throw new Error(`Fontsource has no ${family} ${weight} ${style}`);
        }));
      }
    }
  }
  await Promise.all(jobs).catch((error) => { kitFail(error); throw error; });
  return added;
}

/** Runs `build` and loads any face the pages use that FONTS missed (a regular
 *  one with a warning), then clears the measurement cache and builds again. */
async function buildWithFonts(build, text = '') {
  const tried = new Set();
  for (let round = 0; round < 3; round++) {
    kitStatus('Laying out…');
    await new Promise(requestAnimationFrame);          // let the status paint first
    const result = await Promise.resolve().then(build).catch((error) => { kitFail(error); throw error; });
    const wanted = { base: {}, variants: {} };
    for (const { font, base } of [result].flat().flatMap(fontStringsOf)) {
      const { family, weight, style } = parseFont(font);
      const key = `${family}|${weight}|${style}`;
      if (tried.has(key) || hasFace(family, weight, style)) continue;
      tried.add(key);
      (wanted[base ? 'base' : 'variants'][family] ??= []).push(`${weight}${style === 'italic' ? 'i' : ''}`);
    }
    if (Object.keys(wanted.base).length) {
      console.warn(`[cookbook] FONTS does not list ${JSON.stringify(wanted.base)}: loading them.`);
    }
    const added = await loadFonts(wanted.base, text) + await loadFonts(wanted.variants, text, { optional: true });
    if (added === 0) return result;
    clearMeasurementCache();
  }
  throw new Error('The fonts did not settle after three builds.');
}

/** Every font string of the layout; `base` marks a block's own face. */
function fontStringsOf(doc) {
  const found = new Map();
  const walk = (node) => {
    if (!node || typeof node !== 'object') return;
    if (Array.isArray(node)) { node.forEach(walk); return; }
    for (const [key, value] of Object.entries(node)) {
      if (typeof value === 'string' && /fontString$/i.test(key)) {
        found.set(value, found.get(value) || key === 'fontString');
      } else if (value && typeof value === 'object') walk(value);
    }
  };
  walk(doc.pages);
  walk(doc.blocks);
  return [...found].map(([font, base]) => ({ font, base }));
}

/** '700 37.5px Open Sans' / 'italic 400 13px "Source Serif 4"' → { family, weight, style }.
 *  A string with no weight ('95.8px Young Serif', from a design text) is 400. */
function parseFont(font) {
  const m = /^(?:(italic|oblique)\s+)?(?:small-caps\s+)?(?:(\d+|bold|normal)\s+)?[\d.]+px\s+(.+)$/.exec(font.trim());
  if (!m) throw new Error(`Unexpected font string: ${font}`);
  const weight = m[2] === 'bold' ? 700 : !m[2] || m[2] === 'normal' ? 400 : Number(m[2]);
  return { family: m[3].replace(/^["']|["']$/g, ''), weight, style: m[1] ? 'italic' : 'normal' };
}

/** A loaded FontFace covers this family, weight and style (fonts.check() would
 *  also say yes for families nobody declared). */
function hasFace(family, weight, style) {
  for (const face of document.fonts) {
    if (face.status !== 'loaded' || face.style !== style) continue;
    if (face.family.replace(/^["']|["']$/g, '') !== family) continue;
    const [low, high = low] = face.weight.split(' ').map(Number);
    if (weight >= low && weight <= high) return true;
  }
  return false;
}

/** The files beyond latin `text` needs that `meta`'s family ships. */
function kitSubsetsFor(text, meta) {
  return [[/[Ā-˿ᴀ-ᶿḀ-ỿ†ℓⱠ-Ɀ꜠-ꟿ]/u, 'latin-ext'], [/[Ͱ-Ͽ]/u, 'greek']]
    .filter(([re, x]) => re.test(text) && meta?.subsets?.includes(x)).map(([, x]) => x);
}

/** Fontsource's id for a family: 'Source Serif 4' → 'source-serif-4'. */
function fontsourceId(family) { return family.toLowerCase().replace(/\s+/g, '-'); }

/** The family's Fontsource metadata (weights, styles, subsets), or null. */
function fontsourceMeta(family) {
  fontsourceMeta.cache ??= new Map();
  const id = fontsourceId(family);
  if (!fontsourceMeta.cache.has(id)) {
    fontsourceMeta.cache.set(id, fetch(`https://api.fontsource.org/v1/fonts/${id}`)
      .then((res) => (res.ok ? res.json() : null), () => null));
  }
  return fontsourceMeta.cache.get(id);
}

// ─── Kit · viewer v1 ── the same in every recipe · postext.dev/cookbook
/** The pages as spreads on a dark desk, page 1 alone, then verso | recto,
 *  each painted when it scrolls near. */
function showPages(docs, { title, width = 460 } = {}) {
  const root = viewer(title);
  const pages = [docs].flat().flatMap((doc) =>
    doc.pages.map((page) => ({ doc, page, n: (doc.pageIndexOffset ?? 0) + page.index })));
  const spreads = [];
  let verso = null;
  for (const p of pages) {
    if (p.n % 2 === 1) { if (verso) spreads.push([verso, null]); verso = p; }
    else { spreads.push([verso, p]); verso = null; }
  }
  if (verso) spreads.push([verso, null]);
  const density = Math.min(window.devicePixelRatio || 1, 2);
  showPages.painter?.disconnect();
  const painter = new IntersectionObserver((entries) => {
    for (const { isIntersecting, target } of entries) {
      if (!isIntersecting) continue;
      painter.unobserve(target);
      const { doc, page } = target.postext;
      renderPageToCanvas(page, doc, target, { scale: (width * density) / page.width });
    }
  }, { rootMargin: '800px' });
  showPages.painter = painter;
  root.replaceChildren(...spreads.map((pair) => {
    const spread = document.createElement('div');
    spread.className = 'pt-spread';
    for (const p of pair) {
      const figure = document.createElement('figure');
      if (p) {
        const label = p.page.pageLabel || String(p.n + 1);
        const canvas = document.createElement('canvas');
        canvas.postext = p;
        canvas.style.aspectRatio = `${p.page.width} / ${p.page.height}`;
        canvas.setAttribute('role', 'img');
        canvas.setAttribute('aria-label', `Page ${label}`);
        const folio = document.createElement('figcaption');
        folio.textContent = label;
        figure.append(canvas, folio);
        painter.observe(canvas);
      } else figure.className = 'pt-blank';
      spread.append(figure);
    }
    return spread;
  }));
  kitStatus(`${pages.length} ${pages.length === 1 ? 'page' : 'pages'}`);
  document.documentElement.dataset.postext = 'ready';
  return pages.length;
}

/** The desk, the bar and the error reporting, created once. */
function viewer(title) {
  if (!document.getElementById('pt-kit')) {
    document.head.insertAdjacentHTML('beforeend', `<style id="pt-kit">
      :root { color-scheme: dark; }
      body { margin: 0; background: #0e1014; color: #b9bcc4; font: 13px/1.45 system-ui, sans-serif; }
      #pt-bar { position: sticky; top: 0; z-index: 1; display: flex; flex-wrap: wrap; align-items: center;
        gap: 6px 16px; padding: 10px 16px; background: rgb(14 16 20 / .92); backdrop-filter: blur(6px);
        border-bottom: 1px solid #23262d; }
      #pt-bar strong { color: #f4f1ea; font-weight: 600; }
      #pt-actions { display: flex; gap: 12px; margin-left: auto; }
      #pt-actions a, #pt-actions button { color: #d8a21a; font: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
      #pages { display: grid; justify-items: center; gap: 48px; padding: 32px 16px 72px; }
      .pt-spread { display: flex; }
      .pt-spread figure { margin: 0; width: min(460px, 44vw); }
      .pt-spread canvas { display: block; width: 100%; background: #fff;
        box-shadow: 0 1px 2px rgb(0 0 0 / .5), 0 22px 44px -16px rgb(0 0 0 / .8); }
      .pt-spread figure:first-child canvas { box-shadow: inset -14px 0 14px -14px rgb(0 0 0 / .18), 0 1px 2px rgb(0 0 0 / .5), 0 22px 44px -16px rgb(0 0 0 / .8); }
      .pt-spread figcaption { margin-top: 10px; text-align: center; font: 600 10px/1 system-ui, sans-serif;
        letter-spacing: .18em; text-transform: uppercase; color: #6c7079; }
      .pt-blank { visibility: hidden; }
      @media (max-width: 760px) {
        .pt-spread { flex-direction: column; gap: 32px; }
        .pt-spread figure { width: min(460px, 92vw); }
        .pt-blank { display: none; }
      }
    </style>`);
    document.body.insertAdjacentHTML('afterbegin',
      '<header id="pt-bar"><strong id="pt-title"></strong><span id="pt-status" role="status"></span><span id="pt-actions"></span></header>');
    document.getElementById('pt-title').textContent = document.title || 'Postext';
    addEventListener('error', (event) => kitFail(event.error ?? event.message));
    addEventListener('unhandledrejection', (event) => kitFail(event.reason));
  }
  if (title) document.getElementById('pt-title').textContent = title;
  return document.getElementById('pages')
    ?? document.body.appendChild(Object.assign(document.createElement('main'), { id: 'pages' }));
}

function kitStatus(text) {
  viewer();
  document.getElementById('pt-status').textContent = text;
}

function kitFail(error) {
  document.documentElement.dataset.postext = 'error';
  kitStatus(`Error: ${error?.message ?? error}`);
}

// ─── Kit · pdf v2 ── the same in every recipe that exports a PDF
/** The Fontsource files the screen used, as TrueType: the nearest weight the
 *  family ships, upright if it has no italic; latin, then what the face's
 *  letters need (kitSubsetsFor). */
async function fontsourceProvider(family, weight, style, request) {
  const id = fontsourceId(family);
  const meta = await fontsourceMeta(family);
  const weights = meta?.weights?.length ? meta.weights : [400, 700];
  const w = weights.reduce((a, b) => (Math.abs(b - weight) < Math.abs(a - weight) ? b : a));
  const s = style === 'italic' && meta && !meta.styles.includes('italic') ? 'normal' : style;
  const text = String.fromCodePoint(...(request?.codePoints ?? []));
  const more = kitSubsetsFor(text, meta);
  const files = await Promise.all(['latin', ...more].map(async (subset) => {
    const res = await fetch(`https://cdn.jsdelivr.net/npm/@fontsource/${id}@5/files/${id}-${subset}-${w}-${s}.woff2`);
    if (!res.ok) throw new Error(`Fontsource has no ${family} ${w} ${s} ${subset}`);
    return decompressWoff2(new Uint8Array(await res.arrayBuffer()));
  }));
  return files.length === 1 ? files[0] : files;
}

/** A "Build the PDF" button; then "Open the PDF" (a new tab: CodePen's frame
 *  shows no PDFs) and a download link. */
function offerPdf(makePdf, filename) {
  viewer();
  const button = Object.assign(document.createElement('button'), { type: 'button', textContent: 'Build the PDF' });
  button.dataset.postextPdf = filename;
  button.addEventListener('click', async () => {
    button.disabled = true;
    button.textContent = 'Building the PDF…';
    try {
      const bytes = await makePdf();
      const url = URL.createObjectURL(new Blob([bytes], { type: 'application/pdf' }));
      const size = `${Math.max(1, Math.round(bytes.length / 1024))} KB`;
      button.replaceWith(
        Object.assign(document.createElement('a'), { href: url, target: '_blank', rel: 'noopener', textContent: 'Open the PDF ↗' }),
        Object.assign(document.createElement('a'), { href: url, download: filename, textContent: `Download ${filename} · ${size}` }));
    } catch (error) {
      button.disabled = false;
      button.textContent = 'Build the PDF';
      kitFail(error);
    }
  });
  document.getElementById('pt-actions').append(button);
}

// ─── Kit · images v1 ── recipes with pictures · postext.dev/cookbook
/** Registers a photo or PNG for the canvas and keeps its bytes for the PDF.
 *  fetch → ImageBitmap never taints the canvas (a plain cross-origin <img> would). */
async function loadImage(fileId, url) {
  const res = await fetch(url);
  if (!res.ok) throw new Error(`Image not found (${res.status}): ${url}`);
  const bytes = new Uint8Array(await res.arrayBuffer());
  registerResourceImage(fileId, await createImageBitmap(new Blob([bytes])));
  (loadImage.bytes ??= new Map()).set(fileId, bytes);
}

/** Registers SVG markup (drawn in code, or fetched) as a vector image. */
async function loadSvg(fileId, svg) {
  const img = new Image();
  img.src = `data:image/svg+xml;charset=utf-8,${encodeURIComponent(svg)}`;
  await img.decode();
  registerResourceImage(fileId, img);
  (loadImage.bytes ??= new Map()).set(fileId, new TextEncoder().encode(svg));
}

/** renderToPdf({ resourceBytes: imageBytes }) */
function imageBytes(fileId) { return loadImage.bytes?.get(fileId); }

/** renderToHtml({ resourceImageUrl: imageUrl }) */
function imageUrl(fileId) {
  const bytes = imageBytes(fileId);
  if (!bytes) return undefined;
  imageUrl.urls ??= new Map();
  if (!imageUrl.urls.has(fileId)) {
    const type = /\.svg$/i.test(fileId) ? 'image/svg+xml' : /\.png$/i.test(fileId) ? 'image/png' : 'image/jpeg';
    imageUrl.urls.set(fileId, URL.createObjectURL(new Blob([bytes], { type })));
  }
  return imageUrl.urls.get(fileId);
}

// ─── Kit · cjk v1 ── Chinese, Japanese and Korean books · postext.dev/cookbook
// Fontsource ships a CJK family as about a hundred files per weight, each
// declared in its stylesheet with the unicode-range it covers. The screen
// loads the files the sample touches; the PDF gets the same files for the
// characters its pages set in each face, and embeds each as a subset.
// A book bound on the right (vertical text) is shown with its spreads
// mirrored: page 1 alone on the left of the spine, then [3 | 2].

/** The files of a Fontsource face, read from its stylesheet: { url, range,
 *  ranges }, the last declared first (the order the browser tries them in). */
function cjkSlices(family, weight, style) {
  cjkSlices.cache ??= new Map();
  const id = fontsourceId(family);
  const css = `https://cdn.jsdelivr.net/npm/@fontsource/${id}@5/${weight}${style === 'italic' ? '-italic' : ''}.css`;
  if (!cjkSlices.cache.has(css)) {
    cjkSlices.cache.set(css, fetch(css)
      .then((res) => {
        if (!res.ok) throw new Error(`Fontsource has no ${family} ${weight} ${style} (${res.status})`);
        return res.text();
      })
      .then((text) => [...text.matchAll(/@font-face\s*{([^}]*)}/g)].map(([, rule]) => {
        const range = /unicode-range:\s*([^;]+);/.exec(rule)?.[1].trim() ?? 'U+0-10FFFF';
        const ranges = range.split(',').map((part) => {
          const [lo, hi = lo] = part.trim().slice(2).split('-');
          return [parseInt(lo, 16), parseInt(hi, 16)];
        });
        return { url: new URL(/url\(([^)]+?\.woff2)\)/.exec(rule)[1], css).href, range, ranges };
      }).reverse()));
  }
  return cjkSlices.cache.get(css);
}

/** The file of `slices` that holds code point `cp`, if any. */
function cjkSliceFor(slices, cp) {
  return slices.find((slice) => slice.ranges.some(([lo, hi]) => cp >= lo && cp <= hi));
}

/** Whether Fontsource serves `family` as a Chinese, Japanese or Korean
 *  family (its subsets name the script). Fails when the API does not
 *  answer: a CJK face taken for a Latin one would paint in a system face. */
async function isCjkFamily(family) {
  const meta = await fontsourceMeta(family);
  if (!meta) throw new Error(`api.fontsource.org did not describe ${family}: reload to try again`);
  return !!meta.subsets?.some((subset) => /^(chinese|japanese|korean)/.test(subset));
}

/** faces = { 'Noto Serif TC': ['400', '700'] }, as for loadFonts: the
 *  whole FONTS object may be passed, its other families are left to
 *  loadFonts. Adds one FontFace per file of each CJK face with its
 *  unicodeRange, then loads the files `text` touches. `text` is what the
 *  faces set: the sample for the text face; a book in several voices calls
 *  it once per voice (loadCjkFonts({ 'LXGW WenKai TC': ['400'] }, quotes)),
 *  so the heading and quotation faces fetch and check only their own
 *  characters. Fails when a character of `text` is in no file of a face.
 *  List every weight the pages use: a weight left to buildWithFonts gets
 *  the latin file only. With { vertical: true } it also loads each
 *  family's vertical forms (brackets, quotes, pause marks) for the canvas,
 *  which needs loadVerticalAlternates imported from postext. Resolves to
 *  the number of files loaded. */
async function loadCjkFonts(faces, text, { vertical = false } = {}) {
  kitStatus('Loading fonts…');
  let loaded = 0;
  try {
    if (vertical && typeof loadVerticalAlternates !== 'function') {
      throw new Error('loadCjkFonts(…, { vertical: true }) needs loadVerticalAlternates imported from postext');
    }
    for (const [family, specs] of Object.entries(faces)) {
      if (!(await isCjkFamily(family))) continue;
      const twin = [];
      for (const spec of new Set(specs)) {
        const weight = parseInt(spec, 10);
        const style = spec.endsWith('i') ? 'italic' : 'normal';
        const slices = await cjkSlices(family, weight, style);
        const missing = [...new Set(text)].filter((ch) => /\S/.test(ch) && !cjkSliceFor(slices, ch.codePointAt(0)));
        if (missing.length) {
          throw new Error(`${family} ${spec} has no file for ${missing.slice(0, 12).join(' ')}: `
            + `give each face the text it sets (loadCjkFonts({ '${family}': ['${spec}'] }, text))`);
        }
        for (const slice of slices) {
          document.fonts.add(new FontFace(family, `url(${slice.url}) format('woff2')`,
            { weight: String(weight), style, unicodeRange: slice.range }));
          twin.push({ source: slice.url, weight: String(weight), style, unicodeRange: slice.range });
        }
        const font = `${style === 'italic' ? 'italic ' : ''}${weight} 16px "${family}"`;
        loaded += (await document.fonts.load(font, text)).length;
        if (!document.fonts.check(font, text)) throw new Error(`${family} ${spec} did not load for the sample`);
      }
      // The same files under a twin name with the `vert` feature on: the
      // canvas paints the punctuation of vertical lines with it.
      if (vertical && twin.length) await loadVerticalAlternates(family, twin);
    }
  } catch (error) {
    kitFail(error);
    throw error;
  }
  return loaded;
}

/** The PDF font provider for recipes with CJK faces: a family whose
 *  Fontsource subsets are Chinese, Japanese or Korean gets the files that
 *  hold the characters its pages set (`request.codePoints`); any other
 *  family gets the latin file fontsourceProvider fetches (the "pdf" block)
 *  and, when the face sets letters only latin-ext has, that file too. */
async function cjkPdfProvider(family, weight, style, request) {
  if (!(await isCjkFamily(family))) return cjkLatinPdfFiles(family, weight, style, request);
  const meta = await fontsourceMeta(family);
  const weights = meta.weights?.length ? meta.weights : [400, 700];
  const w = weights.reduce((a, b) => (Math.abs(b - weight) < Math.abs(a - weight) ? b : a));
  const s = style === 'italic' && !meta.styles.includes('italic') ? 'normal' : style;
  const slices = await cjkSlices(family, w, s);
  const picked = new Set();
  for (const cp of request?.codePoints ?? []) {
    const slice = cjkSliceFor(slices, cp);
    if (slice) picked.add(slice);
  }
  if (!picked.size) picked.add(slices[0]);
  return Promise.all(slices.filter((slice) => picked.has(slice)).map(async (slice) => {
    const res = await fetch(slice.url);
    if (!res.ok) throw new Error(`Fontsource file ${slice.url} (${res.status})`);
    return decompressWoff2(new Uint8Array(await res.arrayBuffer()));
  }));
}

/** A Latin family set next to the CJK faces: its latin file, then its
 *  latin-ext file when the face sets letters only latin-ext has (ō ū in
 *  Hepburn rōmaji, ǎ in pinyin), the file loadFonts adds on screen for
 *  them. Latin comes first: postext-pdf draws a character from the first
 *  file that has it, as the browser takes a character both files hold from
 *  latin. A face Fontsource ships without latin-ext, or whose file does
 *  not come, gets latin alone, and the PDF names the letters it lacks. */
async function cjkLatinPdfFiles(family, weight, style, request) {
  const meta = await fontsourceMeta(family);
  const beyond = [...(request?.codePoints ?? [])].some(cjkLatinExtOnly);
  if (!beyond || !meta?.subsets?.includes('latin-ext')) return fontsourceProvider(family, weight, style);
  const weights = meta.weights?.length ? meta.weights : [400, 700];
  const w = weights.reduce((a, b) => (Math.abs(b - weight) < Math.abs(a - weight) ? b : a));
  const s = style === 'italic' && !meta.styles.includes('italic') ? 'normal' : style;
  const id = fontsourceId(family);
  const url = `https://cdn.jsdelivr.net/npm/@fontsource/${id}@5/files/${id}-latin-ext-${w}-${s}.woff2`;
  const [latin, ext] = await Promise.all([fontsourceProvider(family, weight, style), fetch(url)
    .then(async (res) => (res.ok ? decompressWoff2(new Uint8Array(await res.arrayBuffer())) : null), () => null)]);
  return ext ? [latin, ext] : latin;
}

/** Whether code point `cp` is in Fontsource's latin-ext file and not in
 *  its latin file: Latin Extended-A and -B, IPA, the spacing modifiers and
 *  Latin Extended Additional (loadFonts's test for latin-ext), less the
 *  few latin holds too (ı Œ œ ʻ ʼ ˆ ˚ ˜). */
function cjkLatinExtOnly(cp) {
  if (!((cp >= 0x100 && cp <= 0x2ff) || (cp >= 0x1e00 && cp <= 0x1eff))) return false;
  return ![0x131, 0x152, 0x153, 0x2bb, 0x2bc, 0x2c6, 0x2da, 0x2dc].includes(cp);
}

/** showPages for a book bound on either edge. A right-bound book (the
 *  document says so: doc.binding is 'right' for page.binding 'right' and
 *  for vertical text) lies on the desk as it opens: page 1 alone on the
 *  left of the spine, then [3 | 2], the spine shade on each page's inner
 *  edge. `binding` ('left' | 'right') overrides the document's. */
function showBook(docs, { binding, ...options } = {}) {
  const count = showPages(docs, options);
  const right = (binding ?? [docs].flat()[0]?.binding) === 'right';
  if (!document.getElementById('pt-kit-cjk')) {
    // The pages keep direction ltr: a canvas draws text in the direction its
    // element inherits, and under rtl each run would end where the engine
    // starts it, its brackets mirrored.
    document.head.insertAdjacentHTML('beforeend', `<style id="pt-kit-cjk">
      .pt-spread[dir="rtl"] canvas { direction: ltr; }
      .pt-spread[dir="rtl"] figure:first-child canvas { box-shadow: inset 14px 0 14px -14px rgb(0 0 0 / .18),
        0 1px 2px rgb(0 0 0 / .5), 0 22px 44px -16px rgb(0 0 0 / .8); }
    </style>`);
  }
  // Each pair stays [verso, recto] in the page; right to left, the verso
  // sits on the right. Phones stack the pages in reading order either way.
  for (const spread of document.querySelectorAll('#pages > .pt-spread')) spread.dir = right ? 'rtl' : 'ltr';
  document.getElementById('pages').dataset.binding = right ? 'right' : 'left';
  return count;
}

// ─── Kit · arabic v1 ── Arabic-script faces · postext.dev/cookbook
// Fontsource ships an Arabic family as one file per subset and weight: the
// `arabic` file holds the letters, the harakat, the Arabic-Indic digits, the
// Arabic punctuation and the presentation forms; `latin` and `latin-ext`
// hold the rest. loadFonts loads the latin files; this block adds the arabic
// file of every Arabic family, for the canvas and for the PDF, which shapes
// the letters with HarfBuzz from the same bytes.

/** The code points of Fontsource's `arabic` subset, as its stylesheets
 *  declare them (the same unicode-range the browser picks the file by). A
 *  function, not a const: the kit is inlined after the recipe's top-level
 *  awaits, and a const read before its line throws, where a function
 *  declaration is hoisted. */
function arabicRange() {
  return 'U+0600-06FF,U+0750-077F,U+0870-088E,U+0890-0891,U+0897-08E1,U+08E3-08FF,'
    + 'U+200C-200E,U+2010-2011,U+204F,U+2E41,U+FB50-FDFF,U+FE70-FE74,U+FE76-FEFC,U+102E0-102FB,'
    + 'U+10E60-10E7E,U+10EC2-10EC4,U+10EFC-10EFF,U+1EE00-1EEFF';
}

/** Whether code point `cp` is in the arabic file. */
function inArabicRange(cp) {
  inArabicRange.ranges ??= arabicRange().split(',').map((part) => {
    const [lo, hi = lo] = part.slice(2).split('-');
    return [parseInt(lo, 16), parseInt(hi, 16)];
  });
  return inArabicRange.ranges.some(([lo, hi]) => cp >= lo && cp <= hi);
}

/** Whether Fontsource serves `family` with an `arabic` subset. Fails when
 *  the API does not answer: an Arabic face taken for a Latin one would set
 *  its letters in a system face. */
async function isArabicFamily(family) {
  const meta = await fontsourceMeta(family);
  if (!meta) throw new Error(`api.fontsource.org did not describe ${family}: reload to try again`);
  return !!meta.subsets?.includes('arabic');
}

/** The arabic file of a face. */
function arabicFileUrl(family, weight, style) {
  const id = fontsourceId(family);
  return `https://cdn.jsdelivr.net/npm/@fontsource/${id}@5/files/${id}-arabic-${weight}-${style}.woff2`;
}

/** faces = { Amiri: ['400', '700'] }, as for loadFonts, after it: the whole
 *  FONTS object may be passed, its families without an arabic subset are
 *  left alone. Adds the arabic file of every listed weight of each Arabic
 *  family (the latin files come from loadFonts) and loads it. `text` is
 *  the sample: fails when it holds an Arabic-script character the arabic
 *  file does not cover. List every weight the pages set in Arabic: a weight
 *  left to buildWithFonts gets the latin file only, and its Arabic letters
 *  fall back to a system face. Resolves to the number of files loaded. */
async function loadArabicFonts(faces, text = '') {
  kitStatus('Loading fonts…');
  let loaded = 0;
  try {
    const outside = [...new Set(text)].filter((ch) => /\p{Script=Arabic}/u.test(ch) && !inArabicRange(ch.codePointAt(0)));
    if (outside.length) throw new Error(`Fontsource's arabic files have no ${outside.slice(0, 12).join(' ')}`);
    for (const [family, specs] of Object.entries(faces)) {
      if (!(await isArabicFamily(family))) continue;
      for (const spec of new Set(specs)) {
        const weight = parseInt(spec, 10);
        const style = spec.endsWith('i') ? 'italic' : 'normal';
        const face = new FontFace(family, `url(${arabicFileUrl(family, weight, style)}) format('woff2')`,
          { weight: String(weight), style, unicodeRange: arabicRange() });
        document.fonts.add(await face.load().catch(() => {
          throw new Error(`Fontsource has no arabic file for ${family} ${weight} ${style}`);
        }));
        loaded++;
      }
    }
  } catch (error) {
    kitFail(error);
    throw error;
  }
  return loaded;
}

/** The PDF font provider for recipes with Arabic faces: a family with an
 *  arabic subset gets its arabic file when its pages set Arabic letters
 *  (`request.codePoints`), then its latin file, and its latin-ext file for
 *  the letters beyond latin (transliteration: ā ḥ ʿ). The arabic file comes
 *  first: it also holds the space and the brackets, so a line of Arabic is
 *  shaped as one run and not cut at every space. Any other family goes to
 *  fontsourceProvider (the "pdf" block). */
async function arabicPdfProvider(family, weight, style, request) {
  if (!(await isArabicFamily(family))) return fontsourceProvider(family, weight, style, request);
  const meta = await fontsourceMeta(family);
  const weights = meta.weights?.length ? meta.weights : [400, 700];
  const w = weights.reduce((a, b) => (Math.abs(b - weight) < Math.abs(a - weight) ? b : a));
  const s = style === 'italic' && !meta.styles.includes('italic') ? 'normal' : style;
  const wanted = [...(request?.codePoints ?? [])];
  const id = fontsourceId(family);
  const urls = [];
  if (!wanted.length || wanted.some(inArabicRange)) urls.push(arabicFileUrl(family, w, s));
  urls.push(`https://cdn.jsdelivr.net/npm/@fontsource/${id}@5/files/${id}-latin-${w}-${s}.woff2`);
  if (meta.subsets.includes('latin-ext') && wanted.some((cp) => /[Ā-˿Ḁ-ỿ]/u.test(String.fromCodePoint(cp)))) {
    urls.push(`https://cdn.jsdelivr.net/npm/@fontsource/${id}@5/files/${id}-latin-ext-${w}-${s}.woff2`);
  }
  return Promise.all(urls.map(async (url) => {
    const res = await fetch(url);
    if (!res.ok) throw new Error(`Fontsource file ${url} (${res.status})`);
    return decompressWoff2(new Uint8Array(await res.arrayBuffer()));
  }));
}

// ─── Kit · comics v1 ── comic pages · postext.dev/cookbook
// The engine letters a comic in a face per language (defaultComicFont:
// Comic Neue, Zen Antique for Japanese, Noto Sans SC, LXGW WenKai TC,
// Playpen Sans Arabic; defaultComicSfxFont: Bangers, Dela Gothic One,
// ZCOOL KuaiLe, Lalezar) and asks for the bold of a shout or a sound effect
// and the italic of an inner voice. Most of these faces ship one weight and
// no italic: this block declares the file Fontsource does ship for those
// variants, so the canvas measures and paints the letters the PDF embeds
// (the providers snap to the shipped file) and not a bold or a slant the
// browser makes up. It also turns the art manifest into panel resources.

/** faces = { 'Comic Neue': ['400', '700'], Bangers: ['400'] }, as for
 *  loadFonts, after it (and after loadCjkFonts or loadArabicFonts for the
 *  faces of those scripts); the whole FONTS object may be passed. List in
 *  FONTS only what Fontsource ships (Bangers: ['400']): loadFonts fails on
 *  the rest. For each family, the regular, bold, italic and bold italic it
 *  lacks are declared with its nearest file (the regular for the bold, the
 *  upright for the italic) and loaded for `text`. A CJK face needs the cjk
 *  block; an Arabic face setting Arabic, the arabic block. Resolves to the
 *  number of variants added. */
async function loadComicFonts(faces, text = '') {
  kitStatus('Loading fonts…');
  let added = 0;
  try {
    for (const family of Object.keys(faces)) {
      const meta = await fontsourceMeta(family);
      if (!meta) throw new Error(`api.fontsource.org did not describe ${family}: reload to try again`);
      const weights = meta.weights?.length ? meta.weights : [400, 700];
      const styles = meta.styles?.length ? meta.styles : ['normal'];
      for (const [weight, style] of [[400, 'normal'], [700, 'normal'], [400, 'italic'], [700, 'italic']]) {
        if ((weights.includes(weight) && styles.includes(style)) || hasFace(family, weight, style)) continue;
        const w = weights.reduce((a, b) => (Math.abs(b - weight) < Math.abs(a - weight) ? b : a));
        const s = style === 'italic' && styles.includes('italic') ? 'italic' : 'normal';
        for (const { url, range } of await comicFaceFiles(family, w, s, meta, text)) {
          document.fonts.add(new FontFace(family, `url(${url}) format('woff2')`,
            { weight: String(weight), style, unicodeRange: range }));
        }
        await document.fonts.load(`${style === 'italic' ? 'italic ' : ''}${weight} 16px "${family}"`, text || 'A');
        added++;
      }
    }
  } catch (error) {
    kitFail(error);
    throw error;
  }
  return added;
}

/** The files of a shipped face ({ url, range }): a CJK face's slices (the
 *  cjk block reads them from its stylesheet), else latin, the latin-ext
 *  and greek files `text` needs, and the arabic file when `text` holds
 *  Arabic. */
async function comicFaceFiles(family, weight, style, meta, text) {
  if (meta.subsets?.some((subset) => /^(chinese|japanese|korean)/.test(subset))) {
    if (typeof cjkSlices !== 'function') throw new Error(`${family} is a CJK face: list the cjk kit block`);
    return (await cjkSlices(family, weight, style)).map(({ url, range }) => ({ url, range }));
  }
  const id = fontsourceId(family);
  const file = (subset) => `https://cdn.jsdelivr.net/npm/@fontsource/${id}@5/files/${id}-${subset}-${weight}-${style}.woff2`;
  const files = ['latin', ...kitSubsetsFor(text, meta)].map((subset) => ({ url: file(subset), range: comicRange(subset) }));
  if (meta.subsets?.includes('arabic') && /\p{Script=Arabic}/u.test(text)) {
    if (typeof arabicRange !== 'function') throw new Error(`${family} sets Arabic: list the arabic kit block`);
    files.unshift({ url: file('arabic'), range: arabicRange() });
  }
  return files;
}

/** The unicode-range loadFonts gives a Fontsource file. A function, not a
 *  const: the kit is inlined after the recipe's top-level awaits. */
function comicRange(subset) {
  return {
    latin: 'U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,'
      + 'U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD',
    'latin-ext': 'U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,'
      + 'U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF',
    greek: 'U+0370-03FF',
  }[subset];
}

/** The PDF font provider of a comic in any script: a CJK face goes to
 *  cjkPdfProvider, an Arabic face to arabicPdfProvider, any other to
 *  fontsourceProvider (the "pdf" block). Each embeds the shipped weight
 *  and style nearest to the one asked for, the file loadComicFonts
 *  declared for the canvas. */
async function comicPdfProvider(family, weight, style, request) {
  const subsets = (await fontsourceMeta(family))?.subsets ?? [];
  if (subsets.some((subset) => /^(chinese|japanese|korean)/.test(subset))) {
    if (typeof cjkPdfProvider !== 'function') throw new Error(`${family} is a CJK face: list the cjk kit block`);
    return cjkPdfProvider(family, weight, style, request);
  }
  if (subsets.includes('arabic') && typeof arabicPdfProvider === 'function') {
    return arabicPdfProvider(family, weight, style, request);
  }
  return fontsourceProvider(family, weight, style, request);
}

/** A panel picture as a resource for art= (and pop=): loads `url`
 *  (write asset('lh-arrive.jpg') in the call, so the lint checks the file)
 *  and declares it with `meta`, its entry in the art manifest:
 *  { width, height, alt, safeArea, anchors, avoid }. The safe area is what
 *  every crop keeps, the anchors the speakers' mouths, heads and faces,
 *  the avoid zones what no balloon covers; all in fractions of the picture,
 *  the same in every language. Without width and height, the picture's own
 *  size. Needs the images block. Resolves to the resource. */
async function comicPanel(id, url, meta = {}) {
  const fileId = decodeURIComponent(url.split('/').pop());
  await loadImage(fileId, url);
  let { width, height } = meta;
  if (!width || !height) {
    const bitmap = await createImageBitmap(new Blob([imageBytes(fileId)]));
    ({ width, height } = bitmap);
    bitmap.close();
  }
  return {
    id, typeId: meta.typeId ?? 'figure', kind: 'bitmap', createdAt: 0, updatedAt: 0,
    bitmap: { fileId, format: /\.png$/i.test(fileId) ? 'png' : 'jpeg', width, height },
    ...(meta.alt && { altText: meta.alt }),
    ...(meta.safeArea && { safeArea: meta.safeArea }),
    ...(meta.anchors?.length && { anchors: meta.anchors }),
    ...(meta.avoid?.length && { avoid: meta.avoid }),
  };
}

// ─── /Kit ───────────────────────────────────────────────────────────────────────
```

## アレンジ

### Kindle版を省く

リージョンナビゲーションはどの固定EPUBにも書かれます。Kindle Panel Viewはそれに加わるだけです。

```diff
-  kindle: await renderToEpub(doc, { ...book, layout: 'fixed', kindlePanelView: true }),
```

### リフロー版に表紙を付ける

```diff
-  reflowable: await renderToEpub(doc, { ...book, layout: 'reflowable' }),
+  reflowable: await renderToEpub(doc, { ...book, layout: 'reflowable',
+    cover: { bytes: imageBytes('lh-beam.jpg'), mediaType: 'image/jpeg' } }),
```

## よくあるつまずき

- **headingsオブジェクトを渡すとH1の改ページが消える.** 既定ではH1は奇数ページへ改ページします（always-odd）。ところがheadingsオブジェクトを渡すと中身にかかわらずこの既定がリセットされ、章は改ページせずに続けて組まれ、span: 'page'も効かなくなります。どの設定でもheadings.levels[0].breakBefore: { enabled: true, parity }を書き直してください。
- **レイアウトの前にすべてのフォントを読み込む.** レイアウトはブラウザーが読み込んだフォントで文字を計測し、その幅をキャッシュします。最初のビルドのあとに届いたフォントがあると改行位置が狂い、PDFも画面と一致しなくなります。すべてのウェイトとスタイルを先に読み込み、遅れて届いたときは再ビルドの前にclearMeasurementCache()を呼んでください。

- 同じファイルをウエイトごとに埋め込むと4回コピーされます。ウエイトの範囲を使う前は、中国語版が5.3 MBありました。

## クレジット

- レシピ: Ignacio Ferro ([@drnachio](https://github.com/drnachio))
- 画像: Panel picture: Maya arrives at the lighthouse: Generated With Diffusion Models, オリジナル
- 画像: Panel picture: Tomás at the radio: Generated With Diffusion Models, オリジナル
- 画像: Panel picture: Maya finds the problem: Generated With Diffusion Models, オリジナル
- 画像: Panel picture: Biscuit asleep on the cable: Generated With Diffusion Models, オリジナル
- 画像: Panel picture: the lamp lit at night: Generated With Diffusion Models, オリジナル
- 書体: Comic Neue (OFL-1.1), Bangers (OFL-1.1), Zen Antique (OFL-1.1), Dela Gothic One (OFL-1.1), ZCOOL KuaiLe (OFL-1.1), ZCOOL QingKe HuangYou (OFL-1.1), Playpen Sans Arabic (OFL-1.1), Lalezar (OFL-1.1)
- コード: MIT · サンプルの内容: CC-BY-4.0

## 関連レシピ

- [No. 144 · 同じコマを三通りのページ割りで](https://postext.dev/ja/cookbook/comic-page-splitters.md): 五つのコマを三つの分割ツリーで組む。:::pageのsplit属性がページを割り、各絵のセーフエリアがどんな形のコマでも主役を画面に残します。 · 難易度 2 (中級) · 漫画・コミック
- [No. 155 · 台本から写植し直した『ペッパー&キャロット』](https://postext.dev/ja/cookbook/pepper-and-carrot-page.md): 『ペッパー&キャロット』（CC BY 4.0）の2ページを、デイヴィッド・ルヴォワの文字なしの絵と公式翻訳から組み直し、エンジンが六言語で吹き出しを写植します。 · 難易度 3 (上級) · 漫画・コミック
- [No. 145 · 灯台の一ページに、すべての吹き出しを](https://postext.dev/ja/cookbook/balloon-kinds.md): せりふ、思考、ささやき、叫び、無線、ナレーション、心の声、編集部注、描き文字を一ページに。種類は台本の行の波かっこで指定します。 · 難易度 2 (中級) · 漫画・コミック