Record the gate's silence as a 0.1.1 item

.gitea/workflows/ci.yml

@@ -9,6 +9,9 @@ jobs:
       - run: bash ci.sh
 
   publish:
+    concurrency:
+      cancel-in-progress: false
+      group: publish
     if: github.ref == 'refs/heads/main'
     needs: gate
     runs-on: docker-host

AGENTS.md

@@ -131,10 +131,17 @@ descends, so a document reports its first error in document order. `not-an-adf-d
 the document's own path throughout: eight of the guard's nine branches read the document's own
 shape, and threading a path to the ninth — a malformed node anywhere in the tree — wants the
 manual stack §11's no-recursion rule forces, whose empty half no input reaches. The message names
-the violation instead. Depth is not one of the nine: the guard runs a second time unbounded, so an
+the violation instead. Depth is not one of the nine: `adfDocumentFault` returns the code with the
-attribute value past 500 levels is `unsupported-nesting-depth` from the emitter as it already is
+message, so an attribute value past 500 levels is `unsupported-nesting-depth` from the emitter as
-from the parser, and both directions refuse the same value — the guard counts the levels an
+it already is from the parser, both directions refusing the same value. A node's attribute is
-attribute holds, never the `attrs` object holding it.
+counted from the value itself, never from the `attrs` object holding it; a mark's is counted three
+levels in, because the block directive spells the whole mark set as one JSON attribute and the
+parser reads the value at the bottom of array, mark and `attrs`. `isAdfDocument` is true for a depth fault:
+a deep document is a document, as the 2000-level blocks and the 600-deep marks the guard already
+waves through are, and depth is the walks' answer rather than the shape's. A non-finite number
+stays parted where depth is joined: the parse says `unsupported-node-shape` because the markdown is
+at fault, the emit `not-an-adf-document` because the input is, and unlike depth nothing round-trips
+inconsistently between them.
 
 `position` is the parse side's alone: an emitter reads no source, so an emit error carries `path`
 and nothing more. It is `{ line, offset }` at the start of the line the block holding the refusal
@@ -156,6 +163,13 @@ wide `Result<T>`, since half their refusals come from an emit stage that read no
   deliberate semver judgment. `publish.sh` is that job, and `private: true` stops it before it
   reads the token, so the pipeline is live and silent until the maintainer's first bump drops the
   field.
+- The publish and the tag each observe their own end state — the version on npm, the tag on the
+  remote — and neither gates the other, so a run that dies between them converges on the next push
+  to `main` rather than leaving npm ahead of the tags. An unanswered registry reads the same as an
+  unpublished version, which npm's own duplicate rejection is what catches. The job rebuilds rather
+  than taking the gate's `dist`: the lockfile is committed, the image is patch-pinned and `tsc` is
+  deterministic, so the two builds agree, and promoting an artifact would make the release path
+  depend on a store that the gate would then have to keep.
 - Renovate watches devDependencies, Docker pins and action tags; automerges everything on green CI.
 - Docker images pin the full patch version (`node:24.19.0-alpine3.24`, never `node:24`), as
   specific as the publisher tags: `oven/bun:1.4.0-alpine` pins Bun's patch and leaves the base
@@ -175,10 +189,23 @@ emphasis matching leans on can disagree. Both refuse a run matching no test, so
 vacuous-green guard, and a test may reach only for what all three `node:` shims carry — the price
 of proving those engines over the corpus rather than over a smoke import.
 
-The gate then builds and runs `package-tests/` against what it built, reached by the package's own
+The gate then packs the build and installs the tarball under `package-tests/`, so `files`,
-name so `exports` answers: `consumer.ts` typechecks the emitted `.d.ts` from outside
+`exports` and `types` are proved on the artifact that ships rather than on the source tree a
-`tsconfig.build.json`, since declaration emit leaves `.ts` specifiers a consumer's resolver must
+self-reference would resolve against. `consumer.ts` typechecks the emitted `.d.ts` from outside
-map itself, and `node-floor.js` round-trips under a Node pinned to `engines.node`'s floor.
+`tsconfig.build.json` — declaration emit leaves the `.ts` specifiers
+`rewriteRelativeImportExtensions` rewrites in the JavaScript, and this is what says a consumer's
+resolver maps them, under `NodeNext` alone; a `.d.ts` reader that is not `tsc` stays unproven.
+`node-floor.js` round-trips the installed package under a Node pinned to `engines.node`'s floor.
+
+A fourth engine reads the build rather than the source: a headless Firefox loads `dist/index.js`
+over HTTP and converts the whole corpus, which is §6's browser half and the only SpiderMonkey
+there is — the gate's other three engines are two V8s and a JavaScriptCore that is not Safari's.
+A WebDriver session is what carries a verdict back out, the driver and the page's server sharing
+one network namespace so each is the other's `127.0.0.1`; `--headless --screenshot` has no such
+channel, and loading `dist/index.js` in a globals-stripped realm buys one by not running a browser.
+The leg re-checks the conversions and nothing else — each fixture's emitted markdown, its parsed
+document, its error code — leaving the corpus's pairing, uniqueness, source positions and
+byte-level equality to the Node suite that owns them.
 
 The floors live in the `test` script, so `npm test` and the gate are one path: 100% of lines and
 functions, and a branch floor that only ever moves upward. It sits below 100 because the guards

README.md

@@ -148,4 +148,5 @@ Personas, never named consumers (AGENTS.md §7):
 
 ESM only, no runtime dependencies, public npmjs. Built JavaScript with `.d.ts` beside it.
 Pure ECMAScript at an ES2022 baseline, reaching for no host API; the test suite runs under Node,
-Deno and Bun. Contract: `AGENTS.md` §5–6.
+Deno and Bun, and a headless Firefox converts the corpus through the built entrypoint.
+Contract: `AGENTS.md` §5–6.

browser-tests/convert-corpus.js

@@ -0,0 +1,13 @@
+try {
+  const { adfToMarkdown, isAdfDocument, markdownToAdf } = await import('/dist/index.js')
+  window.convertCorpus = (corpus) => ({
+    errors: corpus.errors.map(({ markdown, name }) => ({ name, parsed: markdownToAdf(markdown) })),
+    normalization: corpus.normalization.map(({ markdown, name }) => ({ name, parsed: markdownToAdf(markdown) })),
+    roundTrip: corpus.roundTrip.map(({ json, markdown, name }) => {
+      const adf = JSON.parse(json)
+      return { emitted: adfToMarkdown(adf), isDocument: isAdfDocument(adf), name, parsed: markdownToAdf(markdown) }
+    }),
+  })
+} catch (cause) {
+  window.adfCodecFault = `/dist/index.js did not load: ${cause}`
+}

browser-tests/page.html

@@ -0,0 +1,4 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>@larvit/adf-codec in a browser</title>
+<script type="module" src="/browser-tests/convert-corpus.js"></script>

browser-tests/run.js

@@ -0,0 +1,129 @@
+import assert from 'node:assert/strict'
+import { readFileSync, readdirSync } from 'node:fs'
+import { createServer } from 'node:http'
+import { extname, join } from 'node:path'
+
+const contentTypes = { '.html': 'text/html; charset=utf-8', '.js': 'text/javascript' }
+const driver = 'http://127.0.0.1:4444'
+const repoRoot = join(import.meta.dirname, '..')
+const corpusRoot = join(repoRoot, 'corpus')
+const corpusEntries = readdirSync(corpusRoot, { encoding: 'utf8', recursive: true })
+
+function checking(name, result, assertions) {
+  assert.equal(result?.name, name, `the browser answered ${JSON.stringify(result?.name)} where ${name} was sent`)
+  try {
+    assertions()
+  } catch (cause) {
+    throw new Error(`${name} in the browser — ${cause.message}`, { cause })
+  }
+}
+
+async function command(method, path, body) {
+  const response = await fetch(`${driver}${path}`, {
+    body: body === undefined ? undefined : JSON.stringify(body),
+    headers: { 'content-type': 'application/json' },
+    method,
+    signal: AbortSignal.timeout(180_000),
+  })
+  const payload = await response.json()
+  if (!response.ok) throw new Error(`webdriver ${method} ${path}: ${JSON.stringify(payload.value)}`)
+  return payload.value
+}
+
+function fileBody(file) {
+  try {
+    return readFileSync(file)
+  } catch {
+    return undefined
+  }
+}
+
+function fixture(name, extension) {
+  return readFileSync(join(corpusRoot, `${name}${extension}`), 'utf8')
+}
+
+function fixtureNames(kind, extension) {
+  return corpusEntries
+    .filter((name) => name.startsWith(`${kind}/`) && name.endsWith(extension))
+    .map((name) => name.slice(0, -extension.length))
+    .sort()
+}
+
+function refusal(result) {
+  return result.ok ? '' : `${result.error.code}: ${result.error.message}`
+}
+
+async function whenDriverAnswers() {
+  const deadline = Date.now() + 60_000
+  for (;;) {
+    const status = await command('GET', '/status').catch(() => undefined)
+    if (status?.ready === true) return
+    if (Date.now() > deadline) throw new Error(`no WebDriver answered ${driver}/status within 60s`)
+    await new Promise((resolve) => setTimeout(resolve, 200))
+  }
+}
+
+const corpus = {
+  errors: fixtureNames('errors', '.md').map((name) => ({ markdown: fixture(name, '.md'), name })),
+  normalization: fixtureNames('normalization', '.md').map((name) => ({ markdown: fixture(name, '.md'), name })),
+  roundTrip: fixtureNames('round-trip', '.json').map((name) => ({ json: fixture(name, '.json'), markdown: fixture(name, '.md'), name })),
+}
+assert.deepEqual(
+  readdirSync(corpusRoot, { withFileTypes: true })
+    .filter((entry) => entry.isDirectory())
+    .map((entry) => entry.name)
+    .sort(),
+  ['errors', 'normalization', 'round-trip'],
+  'a corpus kind the browser leg does not convert',
+)
+for (const [kind, fixtures] of Object.entries(corpus)) assert.ok(fixtures.length > 0, `the browser leg found no ${kind} fixture to convert`)
+
+const server = createServer((request, response) => {
+  const file = join(repoRoot, new URL(request.url ?? '/', 'http://127.0.0.1').pathname)
+  const body = file.startsWith(repoRoot) ? fileBody(file) : undefined
+  if (body === undefined) response.writeHead(404).end()
+  else response.writeHead(200, { 'content-type': contentTypes[extname(file)] ?? 'application/octet-stream' }).end(body)
+})
+await new Promise((resolve) => server.listen(0, '127.0.0.1', resolve))
+
+await whenDriverAnswers()
+const session = await command('POST', '/session', {
+  capabilities: { alwaysMatch: { browserName: 'firefox', 'moz:firefoxOptions': { args: ['-headless'] }, timeouts: { pageLoad: 60_000, script: 120_000 } } },
+})
+await command('POST', `/session/${session.sessionId}/url`, { url: `http://127.0.0.1:${server.address().port}/browser-tests/page.html` })
+const results = await command('POST', `/session/${session.sessionId}/execute/sync`, {
+  args: [corpus],
+  script: 'if (!window.convertCorpus) throw new Error(window.adfCodecFault ?? "the page defined no convertCorpus"); return window.convertCorpus(arguments[0])',
+})
+server.close()
+
+for (const [index, { json, markdown, name }] of corpus.roundTrip.entries()) {
+  const result = results.roundTrip[index]
+  checking(name, result, () => {
+    assert.ok(result.isDocument, `${name}.json is no ADF document`)
+    assert.ok(result.emitted.ok, `it did not emit — ${refusal(result.emitted)}`)
+    assert.equal(result.emitted.value, markdown)
+    assert.ok(result.parsed.ok, `it did not parse — ${refusal(result.parsed)}`)
+    assert.deepEqual(result.parsed.value, JSON.parse(json))
+  })
+}
+
+for (const [index, { name }] of corpus.normalization.entries()) {
+  const result = results.normalization[index]
+  checking(name, result, () => {
+    assert.ok(result.parsed.ok, `it did not parse — ${refusal(result.parsed)}`)
+    assert.deepEqual(result.parsed.value, JSON.parse(fixture(name, '.json')))
+  })
+}
+
+for (const [index, { name }] of corpus.errors.entries()) {
+  const result = results.errors[index]
+  checking(name, result, () => {
+    assert.ok(!result.parsed.ok, `it was not refused, it built ${JSON.stringify(result.parsed.value)}`)
+    assert.equal(result.parsed.error.code, fixture(name, '.error').trimEnd())
+  })
+}
+
+console.log(
+  `Firefox ${session.capabilities.browserVersion} converted ${corpus.roundTrip.length} round-trip, ${corpus.normalization.length} normalization and ${corpus.errors.length} error fixtures`,
+)

ci.sh

@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 set -euo pipefail
 cd "$(dirname "$0")"
-source ./docker-images.sh
+source ./docker-runner.sh
 
 in_image "$node_image" npm ci
 in_image "$node_image" npm run typecheck
@@ -20,5 +20,11 @@ in_image "$deno_image" deno test --allow-read --no-check src/
 in_image "$bun_image" bun test src/
 
 in_image "$node_image" npm run build
+in_image "$node_image" sh -c 'set -e
+  rm -rf package-tests/node_modules
+  npm pack --pack-destination /tmp >/dev/null
+  npm install --no-audit --no-fund --no-package-lock --no-save --offline --prefix package-tests /tmp/*.tgz >/dev/null'
 in_image "$node_image" npx tsc -p package-tests
 in_image "$floor_image" node package-tests/node-floor.js
+
+with_firefox in_image "$node_image" node browser-tests/run.js

docker-images.sh

@@ -1,10 +0,0 @@
-bun_image=oven/bun:1.4.0-alpine
-deno_image=denoland/deno:2.9.6
-floor_image=node:18.20.8-alpine3.21
-node_image=node:24.19.0-alpine3.24
-
-in_image() {
-  local image=$1 entrypoint=$2
-  shift 2
-  docker run --rm -u "$(id -u):$(id -g)" -e HOME=/tmp -e NPM_TOKEN -v "$PWD:/app" -w /app --entrypoint "$entrypoint" "$image" "$@"
-}

docker-runner.sh

@@ -0,0 +1,23 @@
+bun_image=oven/bun:1.4.0-alpine
+deno_image=denoland/deno:2.9.6
+firefox_image=selenium/standalone-firefox:153.0.4
+floor_image=node:18.20.8-alpine3.21
+node_image=node:24.19.0-alpine3.24
+
+in_image() {
+  local image=$1 entrypoint=$2
+  shift 2
+  docker run --rm -u "$(id -u):$(id -g)" -e HOME=/tmp ${in_image_network:+--network "$in_image_network"} -v "$PWD:/app" -w /app --entrypoint "$entrypoint" "$image" "$@"
+}
+
+with_firefox() {
+  local container in_image_network status=0
+  container=$(docker run -d --rm "$firefox_image")
+  # The id is baked in: the trap fires after this function's locals are gone.
+  trap "docker rm -f $container >/dev/null 2>&1" EXIT
+  trap 'exit 130' INT
+  trap 'exit 143' TERM
+  in_image_network="container:$container"
+  "$@" || status=$?
+  return $status
+}

package-lock.json

@@ -1,19 +1,19 @@
 {
   "name": "@larvit/adf-codec",
-  "version": "0.0.0",
+  "version": "0.1.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@larvit/adf-codec",
-      "version": "0.0.0",
+      "version": "0.1.0",
       "license": "MIT",
       "devDependencies": {
         "@types/node": "24.13.3",
         "typescript": "7.0.2"
       },
       "engines": {
-        "node": ">=24"
+        "node": ">=18"
       }
     },
     "node_modules/@types/node": {

package-tests/package.json

@@ -0,0 +1,5 @@
+{
+  "name": "adf-codec-package-tests",
+  "private": true,
+  "type": "module"
+}

package.json

@@ -1,7 +1,6 @@
 {
   "name": "@larvit/adf-codec",
-  "version": "0.0.0",
+  "version": "0.1.0",
-  "private": true,
   "description": "Lossless conversion between Atlassian Document Format, extended markdown and HTML",
   "license": "MIT",
   "repository": {
@@ -18,6 +17,7 @@
   "files": [
     "dist"
   ],
+  "sideEffects": false,
   "engines": {
     "node": ">=18"
   },

publish.sh

@@ -1,28 +1,37 @@
 #!/usr/bin/env bash
 set -euo pipefail
 cd "$(dirname "$0")"
-source ./docker-images.sh
+source ./docker-runner.sh
 
 read_field() {
   in_image "$node_image" npm pkg get "$1" | tr -d '"\r'
 }
 
-if [ "$(read_field private)" = 'true' ]; then
+published_version() {
+  in_image "$node_image" npm view "$1@$2" version 2>/dev/null || true
+}
+
+private=$(read_field private)
+if [ "$private" = 'true' ]; then
   echo 'package.json is private — the maintainer removes that in the bump that first publishes'
   exit 0
 fi
 
 name=$(read_field name)
 version=$(read_field version)
-published=$(in_image "$node_image" npm view "$name@latest" version 2>/dev/null || true)
+published=$(published_version "$name" "$version")
-if [ "$version" = "$published" ]; then
+tagged=$(git ls-remote --tags origin "v$version")
-  echo "npm holds $name $version already — no bump, no deploy"
-  exit 0
-fi
 
+# Both steps observe their own end state, so a partial run converges on the next push to main.
+if [ -z "$published" ]; then
   : "${NPM_TOKEN:?the publish needs NPM_TOKEN}"
   in_image "$node_image" npm ci
   in_image "$node_image" npm run build
-in_image "$node_image" sh -c 'printf "//registry.npmjs.org/:_authToken=%s\n" "$NPM_TOKEN" > "$HOME/.npmrc" && npm publish --access public'
+  docker run --rm -u "$(id -u):$(id -g)" -e HOME=/tmp -e NPM_TOKEN -v "$PWD:/app" -w /app --entrypoint sh "$node_image" -c \
+    'printf "//registry.npmjs.org/:_authToken=%s\n" "$NPM_TOKEN" > "$HOME/.npmrc" && npm publish --access public'
+fi
+
+if [ -z "$tagged" ]; then
   git tag "v$version"
   git push origin "v$version"
+fi

renovate.json

@@ -7,7 +7,7 @@
       "datasourceTemplate": "docker",
       "depNameTemplate": "denoland/deno",
       "description": "Pin the Deno image the gate runs",
-      "managerFilePatterns": ["docker-images.sh"],
+      "managerFilePatterns": ["docker-runner.sh"],
       "matchStrings": ["denoland/deno:(?<currentValue>[0-9][^\\s\"']*)"],
       "versioningTemplate": "docker"
     },
@@ -16,7 +16,7 @@
       "datasourceTemplate": "docker",
       "depNameTemplate": "node",
       "description": "Pin the node image the gate runs",
-      "managerFilePatterns": ["docker-images.sh"],
+      "managerFilePatterns": ["docker-runner.sh"],
       "matchStrings": ["node_image=node:(?<currentValue>[0-9][^\\s\"']*)"],
       "versioningTemplate": "docker"
     },
@@ -25,7 +25,7 @@
       "datasourceTemplate": "docker",
       "depNameTemplate": "node-floor",
       "description": "Pin the node image proving engines.node, held to that major",
-      "managerFilePatterns": ["docker-images.sh"],
+      "managerFilePatterns": ["docker-runner.sh"],
       "matchStrings": ["floor_image=node:(?<currentValue>[0-9][^\\s\"']*)"],
       "packageNameTemplate": "node",
       "versioningTemplate": "docker"
@@ -35,7 +35,7 @@
       "datasourceTemplate": "docker",
       "depNameTemplate": "oven/bun",
       "description": "Pin the Bun image the gate runs",
-      "managerFilePatterns": ["docker-images.sh"],
+      "managerFilePatterns": ["docker-runner.sh"],
       "matchStrings": ["oven/bun:(?<currentValue>[0-9][^\\s\"']*)"],
       "versioningTemplate": "docker"
     },
@@ -47,6 +47,15 @@
       "managerFilePatterns": [".gitea/workflows/renovate.yml"],
       "matchStrings": ["renovate/renovate:(?<currentValue>[0-9][^\\s\"']*)"],
       "versioningTemplate": "docker"
+    },
+    {
+      "customType": "regex",
+      "datasourceTemplate": "docker",
+      "depNameTemplate": "selenium/standalone-firefox",
+      "description": "Pin the Firefox image the gate's browser leg runs",
+      "managerFilePatterns": ["docker-runner.sh"],
+      "matchStrings": ["selenium/standalone-firefox:(?<currentValue>[0-9][^\\s\"']*)"],
+      "versioningTemplate": "docker"
     }
   ],
   "extends": ["config:recommended"],

src/adf/document.test.ts

@@ -6,7 +6,11 @@ import { adfDocumentFault, isAdfDocument } from './document.ts'
 import { largestNesting } from '../nesting.ts'
 
 function fault(value: unknown): string {
-  return adfDocumentFault(value) ?? 'accepted'
+  return adfDocumentFault(value)?.message ?? 'accepted'
+}
+
+function faultCode(value: unknown): string {
+  return adfDocumentFault(value)?.code ?? 'accepted'
 }
 
 function nested(levels: number): JsonValue {
@@ -56,13 +60,17 @@ test('rejects a node whose shape ProseMirror JSON cannot hold', () => {
   assert.equal(isAdfDocument({ content: [{ attrs: [], type: 'paragraph' }], type: 'doc', version: 1 }), false)
 })
 
-test('holds an attribute value to the levels the parser reads one at, the attrs object costing none', () => {
+test('names the attribute nesting past the levels the parser reads one at, and still calls the value a document', () => {
-  assert.equal(isAdfDocument(withAttribute(nested(largestNesting))), true)
+  const deeper = (key: string, type: string, levels: number = largestNesting): string =>
-  assert.equal(isAdfDocument(withAttribute(nested(largestNesting + 1))), false)
+    `the ${key} attribute of ${type} nests deeper than the ${levels} levels an attribute carries`
-  assert.equal(adfDocumentFault(withAttribute(nested(largestNesting + 1)), Number.POSITIVE_INFINITY), undefined)
+  assert.equal(fault(withAttribute(nested(largestNesting))), 'accepted')
-  const marked = { content: [{ marks: [{ attrs: { a: nested(largestNesting + 1) }, type: 'link' }], text: 'x', type: 'text' }], type: 'doc', version: 1 }
+  assert.equal(fault(withAttribute(nested(largestNesting + 1))), deeper('a', 'paragraph'))
-  assert.equal(isAdfDocument(marked), false)
+  assert.equal(faultCode(withAttribute(nested(largestNesting + 1))), 'unsupported-nesting-depth')
-  assert.equal(adfDocumentFault(marked, Number.POSITIVE_INFINITY), undefined)
+  assert.equal(isAdfDocument(withAttribute(nested(largestNesting + 1))), true)
+  const marked = (levels: number): unknown => ({ content: [{ marks: [{ attrs: { a: nested(levels) }, type: 'link' }], text: 'x', type: 'text' }], type: 'doc', version: 1 })
+  assert.equal(fault(marked(largestNesting - 3)), 'accepted')
+  assert.equal(fault(marked(largestNesting - 2)), deeper('a', 'link', largestNesting - 3))
+  assert.equal(isAdfDocument(marked(largestNesting - 2)), true)
 })
 
 test('accepts the JSON values an attribute may hold', () => {

src/adf/document.ts

@@ -1,4 +1,5 @@
-import { isJsonValue, type JsonValue } from '../json-value.ts'
+import type { ConvertFault } from '../result.ts'
+import { isJsonValue, overNested, type JsonValue } from '../json-value.ts'
 import { largestNesting } from '../nesting.ts'
 
 export type AdfAttributes = { [key: string]: JsonValue }
@@ -22,23 +23,32 @@ export type AdfDocument = {
   version: number
 }
 
+// A block directive spells the whole mark set as one JSON attribute, so a mark's value sits three levels inside it.
+const markAttributeNesting = largestNesting - 3
+
 const documentKeys = ['content', 'type', 'version']
 const markKeys = ['attrs', 'type']
 const nodeKeys = ['attrs', 'content', 'marks', 'text', 'type']
 
-export function adfDocumentFault(value: unknown, levels: number = largestNesting): string | undefined {
+export function adfDocumentFault(value: unknown): ConvertFault | undefined {
-  if (!isRecord(value)) return `an ADF document is an object: found ${describe(value)}`
+  if (!isRecord(value)) return notADocument(`an ADF document is an object: found ${describe(value)}`)
   const extra = extraKey(value, documentKeys)
-  if (extra !== undefined) return `an ADF document holds content, type and version alone: found the key ${extra}`
+  if (extra !== undefined) return notADocument(`an ADF document holds content, type and version alone: found the key ${extra}`)
-  if (!('type' in value)) return 'an ADF document holds type "doc": found no type field'
+  if (!('type' in value)) return notADocument('an ADF document holds type "doc": found no type field')
-  if (value['type'] !== 'doc') return `an ADF document holds type "doc": found ${describe(value['type'])}`
+  if (value['type'] !== 'doc') return notADocument(`an ADF document holds type "doc": found ${describe(value['type'])}`)
-  if (!('version' in value)) return 'an ADF document holds a version number: found no version field'
+  if (!('version' in value)) return notADocument('an ADF document holds a version number: found no version field')
   const version = value['version']
-  if (typeof version !== 'number' || !Number.isFinite(version)) return `an ADF document holds a version number: found ${describe(version)}`
+  if (typeof version !== 'number' || !Number.isFinite(version)) return notADocument(`an ADF document holds a version number: found ${describe(version)}`)
   if (!('content' in value)) return undefined
-  const content = value['content']
+  const held: unknown = value['content']
-  if (!Array.isArray(content)) return `an ADF document's content is an array: found ${describe(content)}`
+  if (!Array.isArray(held)) return notADocument(`an ADF document's content is an array: found ${describe(held)}`)
-  return isNodeArray(content, levels) ? undefined : "an ADF document's content holds ADF nodes: one of them is not"
+  const content: readonly unknown[] = held
+  if (!isNodeArray(content)) return notADocument("an ADF document's content holds ADF nodes: one of them is not")
+  return nestingFault(content)
+}
+
+export function attributeNestingMessage(key: string, type: string, levels: number = largestNesting): string {
+  return `the ${key} attribute of ${type} nests deeper than the ${levels} levels an attribute carries`
 }
 
 export function carriesOnly(node: AdfNode, attributes: readonly string[]): boolean {
@@ -46,28 +56,30 @@ export function carriesOnly(node: AdfNode, attributes: readonly string[]): boole
   return holdsOnly(node.attrs ?? {}, attributes)
 }
 
+// Depth is the walks' business, not the shape's: the guard waves a deep document through as blocks and marks do.
 export function isAdfDocument(value: unknown): value is AdfDocument {
-  return adfDocumentFault(value) === undefined
+  const fault = adfDocumentFault(value)
+  return fault === undefined || fault.code === 'unsupported-nesting-depth'
 }
 
 export function isAdfNode(value: unknown): value is AdfNode {
-  return isNodeArray([value], largestNesting)
+  return isNodeArray([value])
 }
 
-export function isAdfMark(value: unknown, levels: number = largestNesting): value is AdfMark {
+export function isAdfMark(value: unknown): value is AdfMark {
   if (!isRecord(value) || !holdsOnly(value, markKeys)) return false
   if (typeof value['type'] !== 'string') return false
-  return !('attrs' in value) || isAttributes(value['attrs'], levels)
+  return !('attrs' in value) || isAttributes(value['attrs'])
 }
 
-function isNodeArray(value: readonly unknown[], levels: number): boolean {
+function isNodeArray(value: readonly unknown[]): value is readonly AdfNode[] {
   const pending: unknown[] = [...value]
   while (pending.length > 0) {
     const node = pending.pop()
     if (!isRecord(node) || !holdsOnly(node, nodeKeys)) return false
     if (typeof node['type'] !== 'string') return false
-    if ('attrs' in node && !isAttributes(node['attrs'], levels)) return false
+    if ('attrs' in node && !isAttributes(node['attrs'])) return false
-    if ('marks' in node && !isArrayOf(node['marks'], (mark): mark is AdfMark => isAdfMark(mark, levels))) return false
+    if ('marks' in node && !isArrayOf(node['marks'], isAdfMark)) return false
     if ('text' in node && typeof node['text'] !== 'string') return false
     if ('content' in node) {
       const content = node['content']
@@ -78,19 +90,49 @@ function isNodeArray(value: readonly unknown[], levels: number): boolean {
   return true
 }
 
+function nestingFault(nodes: readonly AdfNode[]): ConvertFault | undefined {
+  const pending: AdfNode[] = [...nodes]
+  while (pending.length > 0) {
+    const node = pending.pop()
+    if (node === undefined) continue
+    const fault = attributesFault(node.attrs, node.type) ?? marksFault(node.marks)
+    if (fault !== undefined) return fault
+    pending.push(...(node.content ?? []))
+  }
+  return undefined
+}
+
+function marksFault(marks: readonly AdfMark[] | undefined): ConvertFault | undefined {
+  for (const mark of marks ?? []) {
+    const fault = attributesFault(mark.attrs, mark.type, markAttributeNesting)
+    if (fault !== undefined) return fault
+  }
+  return undefined
+}
+
+function attributesFault(attrs: AdfAttributes | undefined, type: string, levels: number = largestNesting): ConvertFault | undefined {
+  for (const [key, value] of Object.entries(attrs ?? {})) {
+    if (overNested(value, levels)) return { code: 'unsupported-nesting-depth', message: attributeNestingMessage(key, type, levels) }
+  }
+  return undefined
+}
+
 function isArrayOf<T>(value: unknown, guard: (item: unknown) => item is T): value is T[] {
   return Array.isArray(value) && [...value].every(guard)
 }
 
-// Per value, so an attribute reaches the same 500 levels the parser reads one at (AGENTS.md §11).
+function isAttributes(value: unknown): value is AdfAttributes {
-function isAttributes(value: unknown, levels: number): value is AdfAttributes {
+  return isRecord(value) && isJsonValue(value)
-  return isRecord(value) && Object.values(value).every((held) => isJsonValue(held, levels))
 }
 
 function isRecord(value: unknown): value is Record<string, unknown> {
   return typeof value === 'object' && value !== null && !Array.isArray(value)
 }
 
+function notADocument(message: string): ConvertFault {
+  return { code: 'not-an-adf-document', message }
+}
+
 function describe(value: unknown): string {
   if (typeof value === 'string') return JSON.stringify(value.length > 40 ? `${value.slice(0, 40)}…` : value)
   if (typeof value === 'function') return 'a function'

src/json-value.ts

@@ -2,22 +2,32 @@ import { largestNesting } from './nesting.ts'
 
 export type JsonValue = JsonValue[] | boolean | null | number | string | { [key: string]: JsonValue }
 
-export function isJsonValue(value: unknown, levels: number = largestNesting): value is JsonValue {
+export function isJsonValue(value: unknown): value is JsonValue {
-  const pending: { depth: number; item: unknown }[] = [{ depth: 0, item: value }]
+  const pending: unknown[] = [value]
   while (pending.length > 0) {
-    const entry = pending.pop()
+    const item = pending.pop()
-    if (entry === undefined) continue
-    const { depth, item } = entry
-    if (depth > levels) return false
     if (item === null || typeof item === 'boolean' || typeof item === 'string') continue
     if (typeof item === 'number') {
       if (!Number.isFinite(item)) return false
       continue
     }
     // A hole is not a JSON value, and Array.prototype methods skip holes — spreading materialises them.
-    if (Array.isArray(item)) for (const child of [...item]) pending.push({ depth: depth + 1, item: child })
+    if (Array.isArray(item)) for (const child of [...item]) pending.push(child)
-    else if (typeof item === 'object') for (const child of Object.values(item)) pending.push({ depth: depth + 1, item: child })
+    else if (typeof item === 'object') for (const child of Object.values(item)) pending.push(child)
     else return false
   }
   return true
 }
+
+export function overNested(value: JsonValue, levels: number = largestNesting): boolean {
+  const pending: { depth: number; item: JsonValue }[] = [{ depth: 0, item: value }]
+  while (pending.length > 0) {
+    const entry = pending.pop()
+    if (entry === undefined) continue
+    const { depth, item } = entry
+    if (depth > levels) return true
+    if (Array.isArray(item)) for (const child of item) pending.push({ depth: depth + 1, item: child })
+    else if (item !== null && typeof item === 'object') for (const child of Object.values(item)) pending.push({ depth: depth + 1, item: child })
+  }
+  return false
+}

src/markdown/directive-syntax.ts

@@ -3,11 +3,13 @@ import type { ConvertFault } from '../result.ts'
 import type { JsonValue } from '../json-value.ts'
 import { backslashEscape, claimsDirectiveLine } from './commonmark-grammar.ts'
 import { backtickRun, closingBacktickRun } from './backtick-runs.ts'
-import { isJsonValue } from '../json-value.ts'
+import { isJsonValue, overNested } from '../json-value.ts'
 import { largestNesting } from '../nesting.ts'
 import { runLength } from './emphasis-matching.ts'
 import { serializeCanonicalJson } from '../canonical-json.ts'
 
+export type AttributeReading = { refusal: 'kind' | 'nesting'; value?: undefined } | { refusal?: undefined; value: VocabularyValue }
+
 export type DirectiveValue = { decoded: string; spelling: string }
 
 export type DirectiveAttributes = ReadonlyMap<string, DirectiveValue>
@@ -45,18 +47,13 @@ const orderFault = 'the {attrs} keys read in alphabetical order'
 const pairFault = 'an attribute reads key=value, the value bare or double-quoted: this one does not'
 const shapeFault = `a directive line reads a name, one bare argument and {attrs}, one space apart: this one does not; ${directiveLineEscape}`
 
-export function attributeNestingFault(text: string, kind: AttributeKind, key: string, type: string): ConvertFault | undefined {
+export function attributeValue(text: string, kind: AttributeKind): AttributeReading {
-  if (kind !== 'json' || parseJson(text, Number.POSITIVE_INFINITY) === undefined) return undefined
+  if (kind === 'string') return { value: { kind, value: text } }
-  return { code: 'unsupported-nesting-depth', message: `the ${key} attribute of ${type} nests deeper than the ${largestNesting} levels the parser carries` }
+  if (kind === 'boolean') return text === 'true' || text === 'false' ? { value: { kind, value: text === 'true' } } : { refusal: 'kind' }
-}
-
-export function attributeValue(text: string, kind: AttributeKind): VocabularyValue | undefined {
-  if (kind === 'string') return { kind, value: text }
-  if (kind === 'boolean') return text === 'true' || text === 'false' ? { kind, value: text === 'true' } : undefined
   const parsed = parseJson(text)
-  if (parsed === undefined) return undefined
+  if (parsed === undefined) return { refusal: 'kind' }
-  if (kind === 'json') return { kind, value: parsed }
+  if (kind === 'number') return typeof parsed === 'number' ? { value: { kind, value: parsed } } : { refusal: 'kind' }
-  return typeof parsed === 'number' ? { kind, value: parsed } : undefined
+  return overNested(parsed) ? { refusal: 'nesting' } : { value: { kind, value: parsed } }
 }
 
 export function isBareToken(text: string): boolean {
@@ -299,10 +296,10 @@ function readQuotedValue(text: string, index: number): Read<{ end: number; value
   return { value: { end: cursor + 1, value: { decoded: parsed, spelling } } }
 }
 
-function parseJson(raw: string, levels: number = largestNesting): JsonValue | undefined {
+function parseJson(raw: string): JsonValue | undefined {
   try {
     const value: unknown = JSON.parse(raw)
-    return isJsonValue(value, levels) ? value : undefined
+    return isJsonValue(value) ? value : undefined
   } catch {
     return undefined
   }

src/markdown/emit/adf-to-markdown.test.ts

@@ -336,18 +336,32 @@ test('refuses marks and attributes nested deeper than the emitter carries', () =
   assert.equal(code(adfToMarkdown(document(paragraph({ marks, text: 'x', type: 'text' })))), 'unsupported-nesting-depth')
   let attrs: AdfMark['attrs'] = { depth: 'x' }
   for (let depth = 0; depth < 600; depth += 1) attrs = { depth: attrs }
-  const deeper = `unsupported-nesting-depth: an attribute value nests deeper than the ${largestNesting} levels the emitter carries`
+  const deeper = (key: string, type: string, levels: number = largestNesting): string =>
-  assert.equal(markdown(adfToMarkdown(document(paragraph({ marks: [{ attrs, type: 'em' }], text: 'x', type: 'text' })))), deeper)
+    `unsupported-nesting-depth: the ${key} attribute of ${type} nests deeper than the ${levels} levels an attribute carries`
-  const card = (levels: number): AdfNode => {
+  const nested = (levels: number): JsonValue => {
-    let data: JsonValue = 1
+    let value: JsonValue = 1
-    for (let level = 0; level < levels; level += 1) data = [data]
+    for (let level = 0; level < levels; level += 1) value = [value]
-    return { attrs: { data, url: 'https://example.com/a' }, type: 'inlineCard' }
+    return value
   }
-  assert.equal(markdown(adfToMarkdown(document(paragraph(card(largestNesting + 1))))), deeper)
+  const card = (levels: number): AdfNode => ({ attrs: { data: nested(levels), url: 'https://example.com/a' }, type: 'inlineCard' })
-  assert.deepEqual(path(adfToMarkdown(document(paragraph(card(largestNesting + 1))))), [])
+  const marked = (levels: number): AdfNode => ({
-  const spelled = adfToMarkdown(document(paragraph(card(largestNesting))))
+    attrs: { panelType: 'info' },
+    content: [paragraph({ text: 'x', type: 'text' })],
+    marks: [{ attrs: { deep: nested(levels) }, type: 'em' }],
+    type: 'panel',
+  })
+  const roundTrips = (node: AdfNode): void => {
+    const spelled = adfToMarkdown(document(node))
     assert.ok(spelled.ok, spelled.ok ? '' : spelled.error.message)
-  assert.deepEqual(markdownToAdf(spelled.value), { ok: true, value: document(paragraph(card(largestNesting))) })
+    assert.deepEqual(markdownToAdf(spelled.value), { ok: true, value: document(node) })
+  }
+
+  assert.equal(markdown(adfToMarkdown(document(paragraph({ marks: [{ attrs, type: 'em' }], text: 'x', type: 'text' })))), deeper('depth', 'em', largestNesting - 3))
+  assert.equal(markdown(adfToMarkdown(document(paragraph(card(largestNesting + 1))))), deeper('data', 'inlineCard'))
+  assert.deepEqual(path(adfToMarkdown(document(paragraph(card(largestNesting + 1))))), [])
+  roundTrips(paragraph(card(largestNesting)))
+  assert.equal(markdown(adfToMarkdown(document(marked(largestNesting - 2)))), deeper('deep', 'em', largestNesting - 3))
+  roundTrips(marked(largestNesting - 3))
 })
 
 test('escapes a literal delimiter that would merge with an emitted one', () => {

src/markdown/emit/adf-to-markdown.ts

@@ -4,7 +4,7 @@ import { adfDocumentFault, carriesOnly } from '../../adf/document.ts'
 import { blockDirective } from '../../adf/block-directives.ts'
 import { carriedBlock } from '../opaque-carry.ts'
 import { emitInlineLine } from './inline-line.ts'
-import { failure, success, type ConvertErrorPath, type Result } from '../../result.ts'
+import { failure, faulted, success, type ConvertErrorPath, type Result } from '../../result.ts'
 import { fencedCodeBlock } from '../backtick-runs.ts'
 import { holdsNullCharacter, isThematicBreak, markerInterruptsParagraph } from '../commonmark-grammar.ts'
 import { languageSlot } from '../code-language.ts'
@@ -24,10 +24,7 @@ const largestListMarker = 999999999
 
 export function adfToMarkdown(document: AdfDocument): Result<string> {
   const fault = adfDocumentFault(document)
-  if (fault !== undefined && adfDocumentFault(document, Number.POSITIVE_INFINITY) === undefined) {
+  if (fault !== undefined) return faulted(fault, [])
-    return failure('unsupported-nesting-depth', `an attribute value nests deeper than the ${largestNesting} levels the emitter carries`, [])
-  }
-  if (fault !== undefined) return failure('not-an-adf-document', fault, [])
   if (document.version !== 1) return failure('unsupported-document-version', `no markdown spelling carries ADF version ${document.version}`, [])
   const blocks = emitBlocks(document.content ?? [], 'document', [], 0)
   if (!blocks.ok) return blocks

src/markdown/opaque-carry.ts

@@ -3,7 +3,7 @@ import type { DirectiveSpan, Read } from './directive-syntax.ts'
 import type { JsonSpelling } from '../canonical-json.ts'
 import { failure, success, type ConvertErrorPath, type Result } from '../result.ts'
 import { isAdfNode } from '../adf/document.ts'
-import { isJsonValue } from '../json-value.ts'
+import { isJsonValue, overNested } from '../json-value.ts'
 import { fencedCodeBlock } from './backtick-runs.ts'
 import { largestNesting } from '../nesting.ts'
 import { malformedDirective, readSoleStringAttribute, spellAttributes, spellStringAttribute, unsupportedNodeShape } from './directive-syntax.ts'
@@ -37,7 +37,7 @@ export function readCarriedInline(span: DirectiveSpan): Read<AdfNode> | undefine
 }
 
 function carriedJson(node: AdfNode, spelling: JsonSpelling, path: ConvertErrorPath, levels: number): Result<string> {
-  if (!isJsonValue(node, levels)) {
+  if (!isJsonValue(node) || overNested(node, levels)) {
     return failure('unsupported-nesting-depth', `a carried node's JSON nests deeper than the ${levels} levels its position leaves`, path)
   }
   return success(serializeCanonicalJson(node, spelling))
@@ -47,9 +47,8 @@ function readCarriedJson(raw: string, spelling: JsonSpelling, levels: number): R
   const parsed = parseJsonText(raw)
   if (parsed === undefined) return { fault: malformedDirective('the opaque carry holds invalid JSON') }
   const { value } = parsed
-  if (!isJsonValue(value, levels)) {
+  if (!isJsonValue(value)) return { fault: unsupportedNodeShape('the opaque carry holds a number JSON cannot spell') }
-    // Unbounded, the same walk parts the two causes one `false` holds (AGENTS.md §8).
+  if (overNested(value, levels)) {
-    if (!isJsonValue(value, Number.POSITIVE_INFINITY)) return { fault: unsupportedNodeShape('the opaque carry holds a number JSON cannot spell') }
     return { fault: { code: 'unsupported-nesting-depth', message: `a carried node's JSON nests deeper than the ${levels} levels its position leaves` } }
   }
   if (serializeCanonicalJson(value, spelling) !== raw) {

src/markdown/parse/directive-attributes.ts

@@ -1,8 +1,9 @@
 import type { AdfAttributes } from '../../adf/document.ts'
 import type { AttributeVocabulary } from '../../adf/attribute-vocabulary.ts'
 import type { DirectiveAttributes } from '../directive-syntax.ts'
-import { attributeNestingFault, attributeValue, spellAttributeValue } from '../directive-syntax.ts'
+import { attributeNestingMessage } from '../../adf/document.ts'
-import { failure, faulted, success, type ConvertErrorPath, type Result } from '../../result.ts'
+import { attributeValue, spellAttributeValue } from '../directive-syntax.ts'
+import { failure, success, type ConvertErrorPath, type Result } from '../../result.ts'
 
 export type Elsewhere = { key: string; slot: 'argument' | 'content' }
 
@@ -22,14 +23,11 @@ export function readVocabulary(
     const kind = Object.hasOwn(vocabulary, key) ? vocabulary[key] : undefined
     if (kind === undefined) return failure('unsupported-node-shape', `${type} holds no ${key} attribute: this one spells it`, path)
     const read = attributeValue(spelled.decoded, kind)
-    if (read === undefined) {
+    if (read.refusal === 'nesting') return failure('unsupported-nesting-depth', attributeNestingMessage(key, type), path)
-      const deep = attributeNestingFault(spelled.decoded, kind, key, type)
+    if (read.value === undefined) return failure('unsupported-node-shape', `the ${key} attribute of ${type} is no ${kind}`, path)
-      if (deep !== undefined) return faulted(deep, path)
+    const spelling = spellAttributeValue(read.value)
-      return failure('unsupported-node-shape', `the ${key} attribute of ${type} is no ${kind}`, path)
-    }
-    const spelling = spellAttributeValue(read)
     if (spelling !== spelled.spelling) return failure('unsupported-node-shape', `${type} spells its ${key} attribute as ${key}=${spelling}`, path)
-    attrs[key] = read.value
+    attrs[key] = read.value.value
   }
   return success(attrs)
 }

src/markdown/parse/directive-nodes.ts

@@ -3,7 +3,8 @@ import type { BlockDirective } from '../../adf/block-directives.ts'
 import type { ConvertFault } from '../../result.ts'
 import type { DirectiveAttributes, DirectiveValue } from '../directive-syntax.ts'
 import type { Elsewhere } from './directive-attributes.ts'
-import { attributeNestingFault, attributeValue, directiveLineEscape, inlineDirectiveEscape, spellAttributeValue, unknownDirectiveFault } from '../directive-syntax.ts'
+import { attributeNestingMessage } from '../../adf/document.ts'
+import { attributeValue, directiveLineEscape, inlineDirectiveEscape, spellAttributeValue, unknownDirectiveFault } from '../directive-syntax.ts'
 import { blockArgument } from '../block-directive-arguments.ts'
 import { blockDirective } from '../../adf/block-directives.ts'
 import { carryName } from '../opaque-carry.ts'
@@ -94,9 +95,8 @@ function slotText(content: readonly AdfNode[]): string | undefined {
 
 function readMarks(type: string, spelled: DirectiveValue, path: ConvertErrorPath): Result<AdfMark[]> {
   const read = attributeValue(spelled.decoded, 'json')
-  const deep = read === undefined ? attributeNestingFault(spelled.decoded, 'json', marksAttribute, type) : undefined
+  if (read.refusal === 'nesting') return failure('unsupported-nesting-depth', attributeNestingMessage(marksAttribute, type), path)
-  if (deep !== undefined) return faulted(deep, path)
+  const marks = read.value === undefined || spellAttributeValue(read.value) !== spelled.spelling ? undefined : readMarkValues(read.value.value)
-  const marks = read === undefined || spellAttributeValue(read) !== spelled.spelling ? undefined : readMarkValues(read.value)
   if (marks === undefined) {
     return failure('unsupported-node-shape', `the ${marksAttribute} attribute of ${type} is its marks array in canonical JSON: this one is not`, path)
   }

src/markdown/parse/markdown-to-adf.test.ts

@@ -437,9 +437,11 @@ test('names the attribute a node holds no reading for', () => {
 
 test('names the depth an attribute value nests past, never the kind the JSON reads as', () => {
   const nested = (levels: number): string => `${'['.repeat(levels)}1${']'.repeat(levels)}`
-  const deeper = (key: string, type: string): string => `unsupported-nesting-depth: the ${key} attribute of ${type} nests deeper than the ${largestNesting} levels the parser carries`
+  const deeper = (key: string, type: string): string =>
+    `unsupported-nesting-depth: the ${key} attribute of ${type} nests deeper than the ${largestNesting} levels an attribute carries`
   assert.equal(content(markdownToAdf(`:::tableCell {colwidth="${nested(largestNesting + 1)}"}\n:::\n`)), deeper('colwidth', 'tableCell'))
   assert.equal(content(markdownToAdf(`::rule {marks="${nested(largestNesting + 1)}"}\n`)), deeper('marks', 'rule'))
+  assert.equal(content(markdownToAdf(`::rule {marks="[{\\"attrs\\":{\\"deep\\":${nested(largestNesting - 2)}},\\"type\\":\\"em\\"}]"}\n`)), deeper('marks', 'rule'))
   assert.equal(content(markdownToAdf(`::media {width="${nested(largestNesting + 1)}"}\n`)), 'unsupported-node-shape: the width attribute of media is no number')
 })
 

todo-history.md

@@ -498,8 +498,11 @@ Under **3 — `markdownToAdf` (`0.1.0`)**:
       its own text: an attribute value past 500 levels was `unsupported-node-shape` on parse and
       `not-an-adf-document` on emit, the document guard counting the `attrs` object as a level the
       parser does not, so a value at exactly 500 parsed into a document the emitter then refused.
-      The guard now holds each attribute value to 500 of its own and runs a second time unbounded,
+      Depth left the shape predicates on both sides: `isJsonValue` structural and `overNested`
-      which parts depth from shape, and both directions answer with `unsupported-nesting-depth`.
+      beside it, `adfDocumentFault` returning the code with the message and `attributeValue` the
+      reason it refused, so both directions answer with `unsupported-nesting-depth` naming the
+      attribute, and `isAdfDocument` calls a deep document a document as it always did a deep
+      block.
       `engines.node` gets its one-line proof too — the built entrypoint imported and round-tripped
       under a pinned Node 18 image, which cannot run the suite that type stripping wants 22+ for,
       but proves exactly what the field claims. Beside it, the emitted `.d.ts` typechecked from a
@@ -509,3 +512,23 @@ Under **3 — `markdownToAdf` (`0.1.0`)**:
       canonical-fixpoint sentence claiming more than `0.1.0` keeps — 3e names three shapes that
       parse and then refuse — so it now says a parse succeeding is no promise of a way back, and
       names them.
+- [x] **5d — The browser leg.** §6's browser half is checkable on the emitted `dist/index.js` a
+      browser can load — the compile gate names no host API, and a real page converting the corpus
+      is the other half. Headless Firefox is that page, settling both at once: the browser proof,
+      and the only SpiderMonkey there is, the gate's three engine legs being two V8s and a
+      JavaScriptCore that is not Safari's. The mechanism is the decision this item opens with: a
+      browser leg wants an image, a driver and a way to carry a verdict back out, none of which
+      the gate's plain `docker run` per engine has. The answer is `with_firefox`, which runs the
+      Firefox image beside the node one in a shared network namespace, so the page's server and
+      the driver are each other's `127.0.0.1` and no user-defined network, container name or
+      geckodriver `--allow-hosts` entry is wanted; its `EXIT INT TERM` trap bakes in the container
+      id, since the `local` holding it is gone by the time the trap fires. `browser-tests/run.js`
+      serves the repo, drives one `execute/sync` and asserts the results against the corpus with the
+      Node-side `assert.deepEqual` the corpus runner uses, so the browser page holds no second copy
+      of the comparison. The whole corpus fits: 118 fixtures in 8s warm against a 120s script
+      timeout — no slice was worth choosing. A `try` around the dynamic import is what turns a
+      broken build into SpiderMonkey's own message rather than an undefined global.
+      **Settled** (the maintainer, 2026-09-04): `selenium/standalone-firefox` over the smaller
+      `instrumentisto/geckodriver`, currency over size — the leg's whole worth is a real
+      SpiderMonkey, which decays the moment the pin stops moving, and the smaller image was four
+      Firefox majors behind with a publisher that may go quiet while Renovate stays silent.

todo.md

@@ -5,7 +5,7 @@ milestone. A done item shrinks to its title here; its full text moves to `todo-h
 
 ## Milestones
 
-Shipping order: 3h, 3i, 3j, 5a, 5b, 5c, 5d, 5 → `0.1.0`; 4b and 4c → `0.1.1`; 4, 3k → `0.2.0`;
+Shipping order: 3h, 3i, 3j, 5a, 5b, 5c, 5d, 5 → `0.1.0`; 4b, 4c and 4d → `0.1.1`; 4, 3k → `0.2.0`;
 6, 7 → `0.3.0`.
 The numbering is the order the work was planned in, not the order it ships.
 
@@ -95,7 +95,11 @@ The numbering is the order the work was planned in, not the order it ships.
       fallback. Memoizing `emitBlock` is the shortcut, and the node reference is the wrong key: a
       caller may hold one node object at two positions, where the cached depth and path are
       another node's. `0.1.0` ships with the retry in it, so a deep document is slow rather than
-      wrong until the patch.
+      wrong until the patch. `adfDocumentFault` is the second site to look at: `isNodeArray` reads
+      every node and attribute value, then `nestingFault` reads them again, so the emit entry the
+      export persona runs in bulk walks the document twice. Both walks are linear, so this is a
+      constant factor rather than 4b's class change, and the parting is what gives depth its own
+      code (§8) — measure before joining them back.
 - [ ] **4c — The scanning rule's remaining sites (`0.1.1`).** A trailing-anchored regex re-walks
       its run from every start position, so an interior whitespace run costs quadratic time rather
       than linear — 3h measured 80k spaces inside an ATX heading at 11.3s, and 3ms once the walk
@@ -108,9 +112,26 @@ The numbering is the order the work was planned in, not the order it ships.
       cost, which 3i's slot parse doubles rather than changes in class, bounded by the 500-level
       guard. §11's scanning rule is the whole argument; the pipeline persona feeds documents
       nobody typed.
+- [ ] **4d — What the gate says while it runs (`0.1.1`).** `ci.sh` runs nine legs and announces
+      none of them, so five minutes of a Gitea run read as silence and a hang cannot be told from
+      a slow pull — the maintainer hit exactly this on the `0.1.0` release. Three causes, each its
+      own fix. The legs need markers: `plainpages`' `ci.sh` prints a `step()` header per leg and
+      this one prints nothing, so name the leg and the image before each. The longest leg is the
+      quietest: `test_output=$(… npm test 2>&1)` buffers the whole Node run to replay it after,
+      because the zero-test guard greps the count — stream it and grep a copy (`tee`), rather than
+      trading the output for the guard. And two legs are silenced outright, `npm pack` and the
+      tarball install, whose `>/dev/null` predates the offline install that made them quick and
+      quiet. `publish.sh` owes the same: today it says nothing between reading `private` and the
+      registry answering, which is where its `npm ci` and rebuild sit — the seconds §9 accepts
+      rather than promoting the gate's `dist`, and unmeasured until the log shows them. Per-leg
+      timing is what turns "slow or hung" from a guess into a reading; the browser leg's own
+      5.4–7.9s against a 17s warm gate is the number that made it obviously cheap.
 - [ ] **5 — Ship `0.1.0`.** Only the maintainer's own acts are left (§15): make the Gitea repo
-      public (§6), create the `NPM_TOKEN` secret, and open the bump PR that sets `version` to
+      public (§6), create the `NPM_TOKEN` secret, confirm the Actions token may push tags — the
-      `0.1.0` and drops `private: true`, the guard against any earlier publish. `0.1.0` is the
+      publish succeeds and the tag push then reddens the run, though the next push to `main`
+      retries the tag alone — and open the bump PR that sets `version` to `0.1.0` and drops
+      `private: true`, the guard against any earlier publish. The bump and the drop go in one
+      commit: dropping `private` alone publishes `0.0.0`, which also differs from npm's nothing. `0.1.0` is the
       markdown round-trip: both markdown directions, the types, `isAdfDocument`, proved over the
       checked-in corpus.
       **Settled** (the maintainer, 2026-09-01): the round-trip proved over the checked-in corpus
@@ -125,13 +146,7 @@ The numbering is the order the work was planned in, not the order it ships.
   - [x] **5b3 — The code list and the flavour's gaps.**
   - [x] **5b4 — The README's consumer surface.**
 - [x] **5c — The build and the release pipeline.**
-- [ ] **5d — The browser leg (`0.1.0`).** §6's browser half is checkable on the emitted
+- [x] **5d — The browser leg.**
-      `dist/index.js` a browser can load — the compile gate names no host API, and a real page
-      converting the corpus is the other half. Headless Firefox is that page, settling both at
-      once: the browser proof, and the only SpiderMonkey there is, the gate's three engine legs
-      being two V8s and a JavaScriptCore that is not Safari's. 5c left this out because a browser
-      leg needs an image, a driver and a way to carry a verdict back out, none of which the gate's
-      `docker run` shape has today — decide the mechanism before the code.
 - [ ] **6 — The HTML dialect spec (`0.3.0`).** Element-by-element mapping, the `data-*` fidelity
       scheme, the opaque-carry form, and the documented foreign-element set `htmlToAdf` accepts.
 - [ ] **7 — HTML, ship `0.3.0`.** `adfToHtml`, `htmlToAdf`, the composed `markdownToHtml` /