# lightnovelworld.net — chapter slug vs. series slug
Research note for Gitea issue #77. All pages fetched live on **2026-08-11** with
plain `curl` and a desktop UA. **No Cloudflare challenge was encountered on any
request** — every fetch below returned real HTML on the first try, so the
Playwright fallback was never needed.
Every claim carries the URL it came from. Nothing here is inferred from the
existing code; where a claim is an interpretation rather than an observation it
is marked `[INFERENCE]`.
---
## 1. Summary answer table
| Question | Answer | Evidence |
|---|---|---|
| Does the chapter slug equal the series slug? | **No, not reliably.** 3 of 41 sampled novels diverge at their latest chapter (~7%); a 4th diverges historically. | §4 |
| Best chapter-page → series-URL pointer | `a[aria-label='All Chapter']` and the microdata breadcrumb `a[itemprop=item]` at `position 2`. Both carry the full absolute series URL. | §3 |
| Is JSON-LD `BreadcrumbList` usable? | **No.** The Rank Math JSON-LD breadcrumb on a chapter page contains only *Home* and *the chapter itself* — the series is absent. | §3.1 |
| Is `` usable? | **No.** It points at the chapter page itself. | §3.2 |
| Are `og:` tags usable? | **No.** `og:url` is the chapter page; no `og:` tag names the series. | §3.3 |
| Does the series page list chapters in the initial HTML? | **Yes — all of them.** 1232 unique chapters (1…1232) present in one document. | §5 |
| Is there a paginated chapter endpoint? | **No.** `/novel//chapters/` and `/novel//chapters/page-2` both **404**. | §5 |
| Does the series page carry *other* novels' chapter anchors? | **No.** Across 30 series pages, every `-chapter-N/` URL belonged to the page's own novel. | §6 |
| Unscoped regex `lightnovelworld\.net/[a-z0-9-]+-chapter-([0-9.]+)/` on a series page | **SAFE** | §6 |
| Does `/novel//` 404? | **Yes**, 404, no redirect. | §7 |
| Is there a chapter-slug → series-slug endpoint that avoids parsing a chapter page? | **No endpoint found.** But `//` (no `-chapter-N`) **302s to chapter 1**, which still requires parsing a chapter page. | §7 |
| Is there an "Alternative names" field explaining divergence? | **No such field exists** on lightnovelworld series pages. | §4.3 |
---
## 2. The two reference pages
| URL | Status |
|---|---|
| `https://lightnovelworld.net/my-longevity-simulation-chapter-1/` | **200**, 0 redirects |
| `https://lightnovelworld.net/novel/immortality-simulator/` | **200**, 0 redirects |
| `https://lightnovelworld.net/novel/my-longevity-simulation/` | **404**, 0 redirects |
Confirmed: chapter slug `my-longevity-simulation`, series slug
`immortality-simulator`, and the naive `/novel//` construction is
a hard 404.
---
## 3. Chapter page → series URL: every in-page pointer, in priority order
All snippets below are verbatim from
`https://lightnovelworld.net/my-longevity-simulation-chapter-1/`.
### Priority 1 — `a[aria-label='All Chapter']` ✅ WORKS
Single occurrence in the document, inside the chapter navigation bar:
```html
```
Note the **single quotes** on both attributes — a regex written for `href="` will
miss it. This is the most narrowly-targeted pointer: exactly one element on the
page has `aria-label='All Chapter'`.
### Priority 2 — microdata `BreadcrumbList` / `a[itemprop=item]` ✅ WORKS
At line 363–379 of the served HTML. `position 2` is the series:
```html
```
Bonus: `Immortality Simulator` gives the clean
series **title** as well, which the userscript currently derives by stripping
`Chapter ` off `h1.entry-title`.
Caveat: `itemprop="item"` is **not** unique to the breadcrumb — the site header
nav also uses `itemprop="url"` on anchors, and unrelated `itemprop="item"` usage
could appear. Scope any selector to the enclosing
`[itemtype="http://schema.org/BreadcrumbList"]`.
### Priority 3 — corroborating `/novel/` anchors ⚠️ AMBIGUOUS
The chapter page contains exactly **8** distinct `/novel/…` hrefs. Two are
navigational (`/novel/` index), one is the series, and **five are a
"recommended" strip of unrelated novels**:
```
href="/novel/"
href="https://lightnovelworld.net/novel/"
href="https://lightnovelworld.net/novel/dreadful-radio-game/"
href="https://lightnovelworld.net/novel/evil-god-average/"
href="https://lightnovelworld.net/novel/immortality-simulator/"
href="https://lightnovelworld.net/novel/omniscient-first-persons-viewpoint/"
href="https://lightnovelworld.net/novel/reverend-insanity/"
href="https://lightnovelworld.net/novel/surviving-in-a-romance-fantasy-novel/"
```
So **"grab the first `/novel//` link on a chapter page" is unsafe** — the
recommendation strip contaminates it. Use Priority 1 or 2.
### ❌ NOT usable — JSON-LD `BreadcrumbList` (§3.1)
There is exactly one `application/ld+json` block on the page (Rank Math SEO).
Verbatim:
```html
```
Only two items — Home and the chapter. **The series does not appear.** The
JSON-LD breadcrumb and the visible microdata breadcrumb disagree; the microdata
one is the richer of the two. Do not use the JSON-LD.
### ❌ NOT usable — `` (§3.2)
```html
```
Self-referential.
### ❌ NOT usable — `og:` meta tags (§3.3)
```html
```
`og:url` is the chapter. `og:title` carries the **chapter-slug-derived** title
("My Longevity Simulation"), *not* the series title ("Immortality Simulator") —
so og tags actively reinforce the wrong name.
### Also present — `rel=next` / `rel=prev` chapter navigation
```html
Next
```
Chapter 1 has no `rel=prev`. Useful for walking chapters, useless for finding
the series.
---
## 4. The reverse direction, and how common divergence is
### 4.1 Sample method
Two independent samples, deduplicated:
- 14 novels taken from the latest-updates listing on `https://lightnovelworld.net/`
(distinct chapter slugs), each chapter page fetched and its
`aria-label='All Chapter'` href read for the series slug.
- 30 series URLs taken from `https://lightnovelworld.net/novel/`, each series
page fetched and its chapter anchors' slug prefix extracted. Two of the 30
(`/novel/feed/` and `/novel/list-mode/`) are not novels and are excluded,
leaving 28.
One novel (`investing-in-my-crippled-wife-every-return-makes-me-stronger`)
appears in both samples. **Distinct novels sampled: 41.**
### 4.2 Divergence results
| Series slug (`/novel/<…>/`) | Chapter slug (`/<…>-chapter-N/`) | Result |
|---|---|---|
| `immortality-simulator` | `my-longevity-simulation` | **DIVERGE** |
| `the-sword-illuminates-the-great-wilderness` | `radiant-blade-of-the-wilderness` | **DIVERGE** |
| `a-villains-will-to-survive` | `the-villain-wants-to-live` | **DIVERGE** |
| `all-jobs-and-classes-i-just-wanted-one-skill-not-them-all` | `all-jobs-and-classes-i-just-wanted-one-skill-not` (ch. 1–99) **and** `all-jobs-and-classes-i-just-wanted-one-skill-not-them-all` (ch. 100–423) | **SPLIT** (latest matches) |
| `86-eighty-six` | same | match |
| `a-dungeon-beneath-my-house-let-me-gain-800-exp` | same | match |
| `a-journey-of-black-and-red` | same | match |
| `a-knight-who-eternally-regresses` | same | match |
| `a-regressors-tale-of-cultivation` | same | match |
| `a-will-eternal` | same | match |
| `absolute-resonance` | same | match |
| `absolute-sword-sense` | same | match |
| `advent-of-the-three-calamities` | same | match |
| `after-changing-to-the-ruthless-way-the-brothers-cried-and-begged-for-forgiveness` | same | match |
| `against-the-gods` | same | match |
| `apocalypse-i-built-the-infinite-train` | same | match |
| `arcane-exfil` | same | match |
| `as-a-mafia-boss-i-refuse-to-be-an-extra` | same | match |
| `ascendance-of-a-bookworm` | same | match |
| `avatar-conquering-the-elements` | same | match |
| `battle-world-ascending-without-limits` | same | match |
| `became-the-patron-of-villains` | same | match |
| `ending-maker` | same | match |
| `got-dropped-into-a-ghost-story-still-gotta-work` | same | match |
| `greed-all-for-what` | same | match |
| `investing-in-my-crippled-wife-every-return-makes-me-stronger` | same | match |
| `lord-of-mysteries-2-circle-of-inevitability` | same | match |
| `lord-of-the-mysteries` | same | match |
| `my-vampire-system` | same | match |
| `cleaver-of-sin` | same | match |
| `greatest-legacy-of-the-magus-universe` | same | match |
| `magus-infinite` | same | match |
| `path-of-the-extra` | same | match |
| `regnum-aetern-dual-rebirth` | same | match |
| `shadow-slave` | same | match |
| `slime-evolution` | same | match |
| `sss-awakening-i-can-class-change-at-will` | same | match |
| `the-dao-of-reincarnation-ascending-through-a-hundred-lives` | same | match |
| `the-gamers-pov` | same | match |
| `the-insane-regressor-throne-of-pride` | same | match |
| `the-villains-pov` | same | match |
**Counts (41 distinct novels):**
- **37 match** (90.2%)
- **3 diverge at the latest chapter** (7.3%) — these are the ones that break the poller *today*
- **1 splits mid-series** but its newest chapters happen to match the series slug (2.4%)
`[INFERENCE]` The true site-wide divergence rate is probably in the same
ballpark, but 41 novels out of a catalogue of thousands is a small sample and
the listing page is alphabetically front-loaded. Treat ~7% as an order of
magnitude, not a precise figure.
### 4.3 Is there a derivable rule? **No.**
The divergence is **not directional**, so you cannot compute one slug from the
other:
- `immortality-simulator` — the *series* carries the polished English title
(`
` is absent from the chapter page's
own naming; `og:title` says "My Longevity Simulation"), while the *chapters*
carry the literal translation.
- `the-sword-illuminates-the-great-wilderness` — the reverse: the *series* has
the literal title
(`
The Sword Illuminates the Great Wilderness
`,
`Read The Sword Illuminates the Great Wilderness English Online Free - LightNovelworld`)
while the *chapters* carry the polished one (`radiant-blade-of-the-wilderness`).
- `a-villains-will-to-survive` —
`