Manifest position 626 · CrUX rank bucket 1000

https://ela.education.ne.jp

Coverage complete

Coverage-complete audit of the only discoverable archetype. The requested root and /sitemap.xml return 404; robots.txt exposes no route hints and the page has no links, so no additional representative route could be discovered.

Attempts

1 / 3

Judged checks

58 / 58

Blocked

Not run

This report has no published overall score. Blocked and not-run checks are not passes. A coverage-complete report means every check has a judged outcome; it does not mean every check passed.

All 58 atomic check outcomes

Principle / check	Status	Confidence	Evidence or reason
respect-user-preferences `respects-color-scheme`	issues	high	See linked finding and artifacts for the direct observed failure. F001 medium: The error page ignores the user’s dark color-scheme preference.
respect-user-preferences `respects-reduced-motion`	pass	high	Computed CSS probe and rendered DOM inspection found zero animations and no auto-advance, so reduced-motion users receive a static experience.
respect-user-preferences `respects-contrast`	pass	high	Axe passed color-contrast; the prefers-contrast capture retains visible gray text and divider on white.
implement-natural-interactions `view-transitions`	pass	high	DOM and interaction inventory found no state or route change that swaps abruptly; the observed experience is intentionally static.
implement-natural-interactions `scroll-driven-animations`	pass	high	DOM/CSS probe found no scroll-linked animation and no authored JavaScript or scroll handler running on the main thread.
implement-natural-interactions `physical-gestures`	pass	high	The page exposes no gesture-driven control, custom pointer handling, or scrollable component that fights native behavior.
provide-guided-navigation `scroll-state-aware-chrome`	not-applicable	high	The one-viewport 404 page has no sticky or affixed chrome and no meaningful scroll state.
provide-guided-navigation `anchored-positioning`	not-applicable	high	The page has no tooltip, menu, popover, or anchored overlay.
provide-guided-navigation `directs-attention`	issues	high	See linked finding and artifacts for the direct observed failure. F002 high: The 404 state provides no guided route back to useful content.
maximize-content-reduce-noise `no-intrusive-interruptions`	pass	high	Load screenshot and DOM show only centered error text, with no popup, banner, or interstitial.
maximize-content-reduce-noise `semantic-dismissible-primitives`	not-applicable	high	The page has no overlays, disclosures, pickers, or rich controls.
maximize-content-reduce-noise `reduced-chrome`	pass	high	The screenshot devotes the viewport to a minimal error state with no decorative or application chrome.
adapt-to-the-form-factor `responsive-no-horizontal-scroll`	pass	high	At 360x800, layout measured scrollWidth=clientWidth=360, horizontalOverflowPx=0, with a valid viewport meta tag.
adapt-to-the-form-factor `component-level-responsiveness`	pass	high	The only centered error component remains intact and centered at both desktop and 360px widths without clipping.
adapt-to-the-form-factor `input-modality-aware`	not-applicable	high	The page has no interactive target to operate by touch, pointer, or keyboard.
support-core-task-success `clear-purpose-and-primary-action`	issues	high	See linked finding and artifacts for the direct observed failure. F003 high: The page identifies a 404 but exposes no primary next action.
support-core-task-success `primary-flow-completion`	issues	high	See linked finding and artifacts for the direct observed failure. F004 critical: The requested public root URL is a dead end rather than a completable primary journey.
support-core-task-success `clear-system-state-and-recovery`	issues	high	See linked finding and artifacts for the direct observed failure. F005 high: The error state has no retry, back, home, search, or support recovery.
be-fast-and-stable `good-core-web-vitals`	pass	high	Trace measured LCP 2382.43 ms, CLS 0, and TBT 0 ms; no interaction exists from which to derive INP.
be-fast-and-stable `visual-stability`	pass	high	Three-second mobile layout observation measured CLS 0 with no layout-shift entries; the page has no images or late banners.
be-fast-and-stable `efficient-main-thread`	pass	high	Trace found zero long tasks and total blocking time of 0 ms; rendered DOM has no scripts.
be-fast-and-stable `efficient-resource-delivery`	issues	high	See linked finding and artifacts for the direct observed failure. F006 medium: A render-blocking third-party font delays a 13-character error page.
be-fast-and-stable `trim-unused-and-duplicate-code`	pass	high	HAR and DOM show no JavaScript and one small stylesheet; there is no duplicate or legacy bundle.
be-inclusive `names-roles-labels`	not-applicable	high	The page contains no controls, forms, images, canvas, or media requiring accessible names, roles, labels, or alternatives.
be-inclusive `sufficient-contrast`	pass	high	Axe color-contrast passed for both rendered text nodes.
be-inclusive `structure-and-focus`	issues	high	See linked finding and artifacts for the direct observed failure. F007 medium: The document has no main landmark or heading structure.
be-inclusive `legible-text`	pass	high	Desktop and mobile captures show unclipped 18px/26px text with ample spacing and a simple centered reading order.
be-inclusive `zoom-reflow-targets-and-media`	pass	high	Viewport allows scaling, 360px reflow has no overflow, and there are no touch targets or media requiring target-size/caption evaluation.
follow-best-practices `no-console-errors`	pass	high	The response contains no JavaScript or inline event code capable of throwing; the only network error is the intentional main-document 404 judged separately.
follow-best-practices `sound-document-and-assets`	pass	high	DOM probe confirms HTML doctype, UTF-8, valid viewport metadata, no images, and a small inline stylesheet.
follow-best-practices `browser-platform-hygiene`	pass	high	The script-free page has no deprecated API use, inputs with paste prevention, prompts, libraries, or source-map surface.
be-discoverable `title-and-description`	issues	high	See linked finding and artifacts for the direct observed failure. F008 medium: Metadata is generic and has no description.
be-discoverable `crawlable-and-mobile-friendly`	issues	high	See linked finding and artifacts for the direct observed failure. F009 medium: The error page is mobile-friendly but has no crawlable recovery link.
be-discoverable `canonical-and-indexing-signals`	issues	high	See linked finding and artifacts for the direct observed failure. F010 high: The public root returns 404 and the host exposes no sitemap at /sitemap.xml.
be-discoverable `structured-and-shareable-metadata`	not-applicable	high	A generic HTTP 404 response is not an article, product, organization, event, or other rich entity requiring structured/share metadata.
be-private-and-secure `secure-transport-and-headers`	issues	high	See linked finding and artifacts for the direct observed failure. F011 high: HTTPS is used, but baseline transport/content hardening headers are absent.
be-private-and-secure `data-minimisation-and-third-parties`	pass	high	No cookies, known trackers, analytics, beacons, or exposed secrets were found; two third parties only serve a Google font.
be-private-and-secure `in-context-permissions-and-modern-auth`	not-applicable	high	The page requests no permissions and exposes no authentication surface.
be-private-and-secure `defensive-browser-policies`	issues	high	See linked finding and artifacts for the direct observed failure. F012 medium: Browser-enforced framing, referrer, and permission defenses are not configured.
be-resilient `progressive-enhancement`	pass	high	Discoverability comparison found isJsShell=false and raw HTML contains the same static error state without JavaScript.
be-resilient `resilient-runtime-behaviour`	not-applicable	high	There are no overlays, menus, asynchronous dependencies, or client-side runtime state on this script-free response.
be-resilient `offline-and-installable`	not-applicable	high	This server-rendered error response is not an app surface; installability is not applicable to the observed archetype.
be-resilient `network-and-http-failure-states`	issues	high	See linked finding and artifacts for the direct observed failure. F013 high: The network/HTTP failure state is visible but not recoverable.
be-internationalised `lang-dir-and-logical-properties`	pass	high	The English error text is correctly declared with html lang=en and computes LTR; its simple flex layout does not depend on directional left/right positioning.
be-internationalised `locale-aware-data`	not-applicable	high	The response renders no dates, numbers, currency, durations, calendars, or locale-sensitive data.
be-internationalised `time-zone-correctness`	not-applicable	high	The response renders no date/time or recurring-event data.
be-trustworthy `no-dark-patterns`	pass	high	The static response has no consent, upsell, pricing, continuity, cancellation, advertisement, or interactive choice.
be-trustworthy `humane-error-handling`	not-applicable	high	There is no form or user input to validate.
be-trustworthy `trustworthy-input-assistance`	not-applicable	high	There are no inputs or account/payment/address fields.
be-trustworthy `safe-commercial-and-account-flows`	not-applicable	high	There is no checkout, subscription, consent, authentication, or account-management flow.
be-sustainable `optimised-assets`	pass	high	Images primitive found zero images; total transfer is only 34,784 bytes.
be-sustainable `no-wasteful-work`	pass	high	Trace found no long tasks and DOM/HAR found no scripts, background processing, or repeated fetches.
be-sustainable `third-party-and-media-budget`	pass	high	No media, trackers, or scripts load; two font requests account for 17,866 bytes and total transfer remains 34,784 bytes.
be-agent-ready `structured-agent-capabilities`	not-applicable	high	The observed generic 404 page has no user capability or transaction suitable for agent-tool exposure.
be-agent-ready `on-device-inference`	not-applicable	high	The observed 404 page has no inference or summarisation use case.
be-memory-efficient `no-leak-under-repeated-interaction`	not-applicable	high	The script-free static response has no representative interaction to repeat; fabricating one would not test a real session behavior.
be-memory-efficient `bounded-footprint`	pass	high	Single-state heap summary is proportionate for the tiny page: 26,920 nodes in the V8 snapshot graph, 815,736 self-size bytes, and about 1.09 MB used JS heap.
be-memory-efficient `no-detached-dom-or-unbounded-listeners`	pass	high	Heap summary lists no Detached* constructor population and the page contains no authored JavaScript, event registration, observers, or timers.

Provenance

Canonical report: results/atomic/reports/0626-ela_education_ne_jp.json
Report SHA-256: 9e10451995eb39229eeb22213e82cefa6e8bc56716a15d6d4533d95d6943632e
Local retained report: runs/2026-07-17T17-27-24-856Z/atomic-reports/ela_education_ne_jp/2026-07-22T00-30-18-978Z/report.json
Local evidence root: runs/2026-07-17T17-27-24-856Z/atomic-reports/ela_education_ne_jp/2026-07-22T00-30-18-978Z
Catalog SHA-256: sha256:78ccfdb2d483f4c57d9dafed80fd86c6265585a56457c8dcfddc254b80fb44d7

Raw screenshots, HARs, traces, heaps, and other browser artifacts are retained at the local evidence root and intentionally are not committed. Artifact paths in the canonical report are relative to that root.