{ "url": "https://ela.education.ne.jp", "auditedAt": "2026-07-22T00:32:38Z", "mode": "report", "status": "completed", "statusDetail": "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.", "page": { "appType": "mpa", "framework": "Laravel-style server error template (inferred from markup), no client framework", "notes": "The public root renders a script-free HTTP 404 with 13 characters of visible content." }, "evidenceUsed": [ "screenshot", "dom", "evaluate-probe", "layout-metrics", "trace", "har", "discoverability", "headers", "cookies", "trackers", "secrets", "images", "heap-summary", "lighthouse (attempted; document 404 prevented scores)", "axe-core", "curl HTTP/robots/sitemap" ], "guidanceConsulted": [ "dark-mode", "accessibility", "adapt-scrollbar-to-contrast-preferences", "fluid-scaling", "improve-text-layout-and-legibility", "performance", "optimize-image-priority", "html", "security", "privacy", "forms", "accessible-error-announcement", "flicker-free-client-side-ab-testing", "translator", "support-global-calendar-systems", "scrollability-affordance-hints", "persistent-toast-notifications", "optimize-preload-priority", "conditional-async-dependencies", "reduce-style-repetition" ], "artifacts": [ { "type": "screenshot", "path": "evidence/home-desktop.png", "caption": "Desktop first viewport", "findingIds": [ "F002", "F003", "F005", "F013" ] }, { "type": "screenshot", "path": "evidence/home-mobile.png", "caption": "360x800 mobile viewport", "findingIds": [], "condition": "viewport: 360x800" }, { "type": "screenshot", "path": "evidence/home-dark.png", "caption": "prefers-color-scheme: dark", "findingIds": [ "F001" ], "condition": "prefers-color-scheme: dark" }, { "type": "screenshot", "path": "evidence/home-contrast.png", "caption": "prefers-contrast: more", "findingIds": [], "condition": "prefers-contrast: more" }, { "type": "dom", "path": "evidence/home-dom.json", "caption": "Rendered DOM and CSS", "findingIds": [ "F005" ] }, { "type": "other", "path": "evidence/home-probe.json", "caption": "Route and feature inventory", "findingIds": [] }, { "type": "other", "path": "evidence/full-probe.json", "caption": "Metadata, structure, CSS signals, resource and memory probe", "findingIds": [ "F001", "F002", "F003", "F004", "F007", "F008", "F009" ] }, { "type": "layout", "path": "evidence/home-mobile-layout.json", "caption": "Mobile overflow, CLS and long-task metrics", "findingIds": [], "condition": "viewport: 360x800" }, { "type": "trace", "path": "evidence/home-trace.json", "caption": "DevTools performance trace", "findingIds": [] }, { "type": "trace-summary", "path": "evidence/home-trace-summary.json", "caption": "Compact trace timings and main-thread summary", "findingIds": [ "F006" ] }, { "type": "har", "path": "evidence/home.har", "caption": "Network archive", "findingIds": [] }, { "type": "har-summary", "path": "evidence/home-summary.json", "caption": "Compact HAR network signals", "findingIds": [ "F004", "F006", "F013" ] }, { "type": "discoverability", "path": "evidence/discoverability.json", "caption": "Raw HTML vs rendered discoverability", "findingIds": [ "F010" ] }, { "type": "screenshot", "path": "evidence/discoverability-rendered.png", "caption": "Rendered browser view", "findingIds": [] }, { "type": "screenshot", "path": "evidence/discoverability-crawler.png", "caption": "Crawler/no-JS view", "findingIds": [] }, { "type": "other", "path": "evidence/headers.json", "caption": "Security header audit", "findingIds": [ "F011", "F012" ] }, { "type": "other", "path": "evidence/cookies.json", "caption": "Cookie audit", "findingIds": [] }, { "type": "other", "path": "evidence/trackers.json", "caption": "Third-party/tracker audit", "findingIds": [] }, { "type": "other", "path": "evidence/secrets.json", "caption": "Client secret scan", "findingIds": [] }, { "type": "other", "path": "evidence/images.json", "caption": "Image audit", "findingIds": [] }, { "type": "heap", "path": "evidence/home-heap.json", "caption": "Single-state heap summary", "findingIds": [] }, { "type": "lighthouse", "path": "evidence/lighthouse.json", "caption": "Lighthouse artifact; navigation scoring blocked by HTTP 404", "findingIds": [] }, { "type": "other", "path": "evidence/axe.json", "caption": "axe-core accessibility results", "findingIds": [ "F007" ] }, { "type": "other", "path": "evidence/robots.json", "caption": "robots.txt fetch result", "findingIds": [ "F009" ] }, { "type": "other", "path": "evidence/robots.txt", "caption": "robots.txt response", "findingIds": [] }, { "type": "other", "path": "evidence/sitemap-response.html", "caption": "404 response from /sitemap.xml", "findingIds": [ "F010" ] } ], "config": { "loaded": false }, "coverage": { "catalogVersion": "modern-web-guidance@0.0.172", "catalogChecksum": "sha256:78ccfdb2d483f4c57d9dafed80fd86c6265585a56457c8dcfddc254b80fb44d7", "expected": 58, "recorded": 58, "judged": 58, "blocked": 0, "notRun": 0, "missing": 0, "unknown": 0, "duplicates": 0, "complete": true }, "checkOutcomes": [ { "principleId": "respect-user-preferences", "checkId": "respects-color-scheme", "confidence": "high", "pathIds": [ "root-error" ], "status": "issues", "method": "Site-tailored visual and objective evidence review against the check outcome.", "evidence": "See linked finding and artifacts for the direct observed failure.", "findingIds": [ "F001" ], "artifacts": [ "evidence/full-probe.json", "evidence/home-dark.png" ] }, { "principleId": "respect-user-preferences", "checkId": "respects-reduced-motion", "confidence": "high", "pathIds": [ "root-error" ], "status": "pass", "method": "Rendered DOM/evaluate plus the cited objective or visual artifact.", "evidence": "Computed CSS probe and rendered DOM inspection found zero animations and no auto-advance, so reduced-motion users receive a static experience.", "artifacts": [ "evidence/full-probe.json" ] }, { "principleId": "respect-user-preferences", "checkId": "respects-contrast", "confidence": "high", "pathIds": [ "root-error" ], "status": "pass", "method": "Rendered DOM/evaluate plus the cited objective or visual artifact.", "evidence": "Axe passed color-contrast; the prefers-contrast capture retains visible gray text and divider on white.", "artifacts": [ "evidence/axe.json", "evidence/home-contrast.png" ] }, { "principleId": "implement-natural-interactions", "checkId": "view-transitions", "confidence": "high", "pathIds": [ "root-error" ], "status": "pass", "method": "Rendered DOM/evaluate plus the cited objective or visual artifact.", "evidence": "DOM and interaction inventory found no state or route change that swaps abruptly; the observed experience is intentionally static.", "artifacts": [ "evidence/full-probe.json" ] }, { "principleId": "implement-natural-interactions", "checkId": "scroll-driven-animations", "confidence": "high", "pathIds": [ "root-error" ], "status": "pass", "method": "Rendered DOM/evaluate plus the cited objective or visual artifact.", "evidence": "DOM/CSS probe found no scroll-linked animation and no authored JavaScript or scroll handler running on the main thread.", "artifacts": [ "evidence/full-probe.json", "evidence/home-dom.json" ] }, { "principleId": "implement-natural-interactions", "checkId": "physical-gestures", "confidence": "high", "pathIds": [ "root-error" ], "status": "pass", "method": "Rendered DOM/evaluate plus the cited objective or visual artifact.", "evidence": "The page exposes no gesture-driven control, custom pointer handling, or scrollable component that fights native behavior.", "artifacts": [ "evidence/full-probe.json", "evidence/home-dom.json" ] }, { "principleId": "provide-guided-navigation", "checkId": "scroll-state-aware-chrome", "confidence": "high", "status": "not-applicable", "method": "Applicability judgement from rendered DOM and interaction inventory.", "evidence": "The one-viewport 404 page has no sticky or affixed chrome and no meaningful scroll state.", "reason": "The one-viewport 404 page has no sticky or affixed chrome and no meaningful scroll state." }, { "principleId": "provide-guided-navigation", "checkId": "anchored-positioning", "confidence": "high", "status": "not-applicable", "method": "Applicability judgement from rendered DOM and interaction inventory.", "evidence": "The page has no tooltip, menu, popover, or anchored overlay.", "reason": "The page has no tooltip, menu, popover, or anchored overlay." }, { "principleId": "provide-guided-navigation", "checkId": "directs-attention", "confidence": "high", "pathIds": [ "root-error" ], "status": "issues", "method": "Site-tailored visual and objective evidence review against the check outcome.", "evidence": "See linked finding and artifacts for the direct observed failure.", "findingIds": [ "F002" ], "artifacts": [ "evidence/full-probe.json", "evidence/home-desktop.png" ] }, { "principleId": "maximize-content-reduce-noise", "checkId": "no-intrusive-interruptions", "confidence": "high", "pathIds": [ "root-error" ], "status": "pass", "method": "Rendered DOM/evaluate plus the cited objective or visual artifact.", "evidence": "Load screenshot and DOM show only centered error text, with no popup, banner, or interstitial.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json" ] }, { "principleId": "maximize-content-reduce-noise", "checkId": "semantic-dismissible-primitives", "confidence": "high", "status": "not-applicable", "method": "Applicability judgement from rendered DOM and interaction inventory.", "evidence": "The page has no overlays, disclosures, pickers, or rich controls.", "reason": "The page has no overlays, disclosures, pickers, or rich controls." }, { "principleId": "maximize-content-reduce-noise", "checkId": "reduced-chrome", "confidence": "high", "pathIds": [ "root-error" ], "status": "pass", "method": "Rendered DOM/evaluate plus the cited objective or visual artifact.", "evidence": "The screenshot devotes the viewport to a minimal error state with no decorative or application chrome.", "artifacts": [ "evidence/home-desktop.png" ] }, { "principleId": "adapt-to-the-form-factor", "checkId": "responsive-no-horizontal-scroll", "confidence": "high", "pathIds": [ "root-error" ], "status": "pass", "method": "Rendered DOM/evaluate plus the cited objective or visual artifact.", "evidence": "At 360x800, layout measured scrollWidth=clientWidth=360, horizontalOverflowPx=0, with a valid viewport meta tag.", "artifacts": [ "evidence/home-mobile-layout.json", "evidence/home-mobile.png" ] }, { "principleId": "adapt-to-the-form-factor", "checkId": "component-level-responsiveness", "confidence": "high", "pathIds": [ "root-error" ], "status": "pass", "method": "Rendered DOM/evaluate plus the cited objective or visual artifact.", "evidence": "The only centered error component remains intact and centered at both desktop and 360px widths without clipping.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-mobile.png" ] }, { "principleId": "adapt-to-the-form-factor", "checkId": "input-modality-aware", "confidence": "high", "status": "not-applicable", "method": "Applicability judgement from rendered DOM and interaction inventory.", "evidence": "The page has no interactive target to operate by touch, pointer, or keyboard.", "reason": "The page has no interactive target to operate by touch, pointer, or keyboard." }, { "principleId": "support-core-task-success", "checkId": "clear-purpose-and-primary-action", "confidence": "high", "pathIds": [ "root-error" ], "status": "issues", "method": "Site-tailored visual and objective evidence review against the check outcome.", "evidence": "See linked finding and artifacts for the direct observed failure.", "findingIds": [ "F003" ], "artifacts": [ "evidence/full-probe.json", "evidence/home-desktop.png" ] }, { "principleId": "support-core-task-success", "checkId": "primary-flow-completion", "confidence": "high", "pathIds": [ "root-error" ], "status": "issues", "method": "Site-tailored visual and objective evidence review against the check outcome.", "evidence": "See linked finding and artifacts for the direct observed failure.", "findingIds": [ "F004" ], "artifacts": [ "evidence/full-probe.json", "evidence/home-summary.json" ] }, { "principleId": "support-core-task-success", "checkId": "clear-system-state-and-recovery", "confidence": "high", "pathIds": [ "root-error" ], "status": "issues", "method": "Site-tailored visual and objective evidence review against the check outcome.", "evidence": "See linked finding and artifacts for the direct observed failure.", "findingIds": [ "F005" ], "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json" ] }, { "principleId": "be-fast-and-stable", "checkId": "good-core-web-vitals", "confidence": "high", "pathIds": [ "root-error" ], "status": "pass", "method": "Rendered DOM/evaluate plus the cited objective or visual artifact.", "evidence": "Trace measured LCP 2382.43 ms, CLS 0, and TBT 0 ms; no interaction exists from which to derive INP.", "artifacts": [ "evidence/home-trace-summary.json", "evidence/home-mobile-layout.json" ] }, { "principleId": "be-fast-and-stable", "checkId": "visual-stability", "confidence": "high", "pathIds": [ "root-error" ], "status": "pass", "method": "Rendered DOM/evaluate plus the cited objective or visual artifact.", "evidence": "Three-second mobile layout observation measured CLS 0 with no layout-shift entries; the page has no images or late banners.", "artifacts": [ "evidence/home-mobile-layout.json", "evidence/images.json" ] }, { "principleId": "be-fast-and-stable", "checkId": "efficient-main-thread", "confidence": "high", "pathIds": [ "root-error" ], "status": "pass", "method": "Rendered DOM/evaluate plus the cited objective or visual artifact.", "evidence": "Trace found zero long tasks and total blocking time of 0 ms; rendered DOM has no scripts.", "artifacts": [ "evidence/home-trace-summary.json", "evidence/home-dom.json" ] }, { "principleId": "be-fast-and-stable", "checkId": "efficient-resource-delivery", "confidence": "high", "pathIds": [ "root-error" ], "status": "issues", "method": "Site-tailored visual and objective evidence review against the check outcome.", "evidence": "See linked finding and artifacts for the direct observed failure.", "findingIds": [ "F006" ], "artifacts": [ "evidence/home-summary.json", "evidence/home-trace-summary.json" ] }, { "principleId": "be-fast-and-stable", "checkId": "trim-unused-and-duplicate-code", "confidence": "high", "pathIds": [ "root-error" ], "status": "pass", "method": "Rendered DOM/evaluate plus the cited objective or visual artifact.", "evidence": "HAR and DOM show no JavaScript and one small stylesheet; there is no duplicate or legacy bundle.", "artifacts": [ "evidence/home-summary.json", "evidence/home-dom.json" ] }, { "principleId": "be-inclusive", "checkId": "names-roles-labels", "confidence": "high", "status": "not-applicable", "method": "Applicability judgement from rendered DOM and interaction inventory.", "evidence": "The page contains no controls, forms, images, canvas, or media requiring accessible names, roles, labels, or alternatives.", "reason": "The page contains no controls, forms, images, canvas, or media requiring accessible names, roles, labels, or alternatives." }, { "principleId": "be-inclusive", "checkId": "sufficient-contrast", "confidence": "high", "pathIds": [ "root-error" ], "status": "pass", "method": "Rendered DOM/evaluate plus the cited objective or visual artifact.", "evidence": "Axe color-contrast passed for both rendered text nodes.", "artifacts": [ "evidence/axe.json" ] }, { "principleId": "be-inclusive", "checkId": "structure-and-focus", "confidence": "high", "pathIds": [ "root-error" ], "status": "issues", "method": "Site-tailored visual and objective evidence review against the check outcome.", "evidence": "See linked finding and artifacts for the direct observed failure.", "findingIds": [ "F007" ], "artifacts": [ "evidence/axe.json", "evidence/full-probe.json" ] }, { "principleId": "be-inclusive", "checkId": "legible-text", "confidence": "high", "pathIds": [ "root-error" ], "status": "pass", "method": "Rendered DOM/evaluate plus the cited objective or visual artifact.", "evidence": "Desktop and mobile captures show unclipped 18px/26px text with ample spacing and a simple centered reading order.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-mobile.png", "evidence/full-probe.json" ] }, { "principleId": "be-inclusive", "checkId": "zoom-reflow-targets-and-media", "confidence": "high", "pathIds": [ "root-error" ], "status": "pass", "method": "Rendered DOM/evaluate plus the cited objective or visual artifact.", "evidence": "Viewport allows scaling, 360px reflow has no overflow, and there are no touch targets or media requiring target-size/caption evaluation.", "artifacts": [ "evidence/home-mobile-layout.json", "evidence/full-probe.json" ] }, { "principleId": "follow-best-practices", "checkId": "no-console-errors", "confidence": "high", "pathIds": [ "root-error" ], "status": "pass", "method": "Rendered DOM/evaluate plus the cited objective or visual artifact.", "evidence": "The response contains no JavaScript or inline event code capable of throwing; the only network error is the intentional main-document 404 judged separately.", "artifacts": [ "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "follow-best-practices", "checkId": "sound-document-and-assets", "confidence": "high", "pathIds": [ "root-error" ], "status": "pass", "method": "Rendered DOM/evaluate plus the cited objective or visual artifact.", "evidence": "DOM probe confirms HTML doctype, UTF-8, valid viewport metadata, no images, and a small inline stylesheet.", "artifacts": [ "evidence/full-probe.json", "evidence/images.json" ] }, { "principleId": "follow-best-practices", "checkId": "browser-platform-hygiene", "confidence": "high", "pathIds": [ "root-error" ], "status": "pass", "method": "Rendered DOM/evaluate plus the cited objective or visual artifact.", "evidence": "The script-free page has no deprecated API use, inputs with paste prevention, prompts, libraries, or source-map surface.", "artifacts": [ "evidence/home-dom.json", "evidence/full-probe.json" ] }, { "principleId": "be-discoverable", "checkId": "title-and-description", "confidence": "high", "pathIds": [ "root-error" ], "status": "issues", "method": "Site-tailored visual and objective evidence review against the check outcome.", "evidence": "See linked finding and artifacts for the direct observed failure.", "findingIds": [ "F008" ], "artifacts": [ "evidence/full-probe.json" ] }, { "principleId": "be-discoverable", "checkId": "crawlable-and-mobile-friendly", "confidence": "high", "pathIds": [ "root-error" ], "status": "issues", "method": "Site-tailored visual and objective evidence review against the check outcome.", "evidence": "See linked finding and artifacts for the direct observed failure.", "findingIds": [ "F009" ], "artifacts": [ "evidence/full-probe.json", "evidence/robots.json" ] }, { "principleId": "be-discoverable", "checkId": "canonical-and-indexing-signals", "confidence": "high", "pathIds": [ "root-error" ], "status": "issues", "method": "Site-tailored visual and objective evidence review against the check outcome.", "evidence": "See linked finding and artifacts for the direct observed failure.", "findingIds": [ "F010" ], "artifacts": [ "evidence/discoverability.json", "evidence/sitemap-response.html" ] }, { "principleId": "be-discoverable", "checkId": "structured-and-shareable-metadata", "confidence": "high", "status": "not-applicable", "method": "Applicability judgement from rendered DOM and interaction inventory.", "evidence": "A generic HTTP 404 response is not an article, product, organization, event, or other rich entity requiring structured/share metadata.", "reason": "A generic HTTP 404 response is not an article, product, organization, event, or other rich entity requiring structured/share metadata." }, { "principleId": "be-private-and-secure", "checkId": "secure-transport-and-headers", "confidence": "high", "pathIds": [ "root-error" ], "status": "issues", "method": "Site-tailored visual and objective evidence review against the check outcome.", "evidence": "See linked finding and artifacts for the direct observed failure.", "findingIds": [ "F011" ], "artifacts": [ "evidence/headers.json" ] }, { "principleId": "be-private-and-secure", "checkId": "data-minimisation-and-third-parties", "confidence": "high", "pathIds": [ "root-error" ], "status": "pass", "method": "Rendered DOM/evaluate plus the cited objective or visual artifact.", "evidence": "No cookies, known trackers, analytics, beacons, or exposed secrets were found; two third parties only serve a Google font.", "artifacts": [ "evidence/cookies.json", "evidence/trackers.json", "evidence/secrets.json", "evidence/home-summary.json" ] }, { "principleId": "be-private-and-secure", "checkId": "in-context-permissions-and-modern-auth", "confidence": "high", "status": "not-applicable", "method": "Applicability judgement from rendered DOM and interaction inventory.", "evidence": "The page requests no permissions and exposes no authentication surface.", "reason": "The page requests no permissions and exposes no authentication surface." }, { "principleId": "be-private-and-secure", "checkId": "defensive-browser-policies", "confidence": "high", "pathIds": [ "root-error" ], "status": "issues", "method": "Site-tailored visual and objective evidence review against the check outcome.", "evidence": "See linked finding and artifacts for the direct observed failure.", "findingIds": [ "F012" ], "artifacts": [ "evidence/headers.json" ] }, { "principleId": "be-resilient", "checkId": "progressive-enhancement", "confidence": "high", "pathIds": [ "root-error" ], "status": "pass", "method": "Rendered DOM/evaluate plus the cited objective or visual artifact.", "evidence": "Discoverability comparison found isJsShell=false and raw HTML contains the same static error state without JavaScript.", "artifacts": [ "evidence/discoverability.json", "evidence/discoverability-crawler.png" ] }, { "principleId": "be-resilient", "checkId": "resilient-runtime-behaviour", "confidence": "high", "status": "not-applicable", "method": "Applicability judgement from rendered DOM and interaction inventory.", "evidence": "There are no overlays, menus, asynchronous dependencies, or client-side runtime state on this script-free response.", "reason": "There are no overlays, menus, asynchronous dependencies, or client-side runtime state on this script-free response." }, { "principleId": "be-resilient", "checkId": "offline-and-installable", "confidence": "high", "status": "not-applicable", "method": "Applicability judgement from rendered DOM and interaction inventory.", "evidence": "This server-rendered error response is not an app surface; installability is not applicable to the observed archetype.", "reason": "This server-rendered error response is not an app surface; installability is not applicable to the observed archetype." }, { "principleId": "be-resilient", "checkId": "network-and-http-failure-states", "confidence": "high", "pathIds": [ "root-error" ], "status": "issues", "method": "Site-tailored visual and objective evidence review against the check outcome.", "evidence": "See linked finding and artifacts for the direct observed failure.", "findingIds": [ "F013" ], "artifacts": [ "evidence/home-desktop.png", "evidence/home-summary.json" ] }, { "principleId": "be-internationalised", "checkId": "lang-dir-and-logical-properties", "confidence": "high", "pathIds": [ "root-error" ], "status": "pass", "method": "Rendered DOM/evaluate plus the cited objective or visual artifact.", "evidence": "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.", "artifacts": [ "evidence/full-probe.json" ] }, { "principleId": "be-internationalised", "checkId": "locale-aware-data", "confidence": "high", "status": "not-applicable", "method": "Applicability judgement from rendered DOM and interaction inventory.", "evidence": "The response renders no dates, numbers, currency, durations, calendars, or locale-sensitive data.", "reason": "The response renders no dates, numbers, currency, durations, calendars, or locale-sensitive data." }, { "principleId": "be-internationalised", "checkId": "time-zone-correctness", "confidence": "high", "status": "not-applicable", "method": "Applicability judgement from rendered DOM and interaction inventory.", "evidence": "The response renders no date/time or recurring-event data.", "reason": "The response renders no date/time or recurring-event data." }, { "principleId": "be-trustworthy", "checkId": "no-dark-patterns", "confidence": "high", "pathIds": [ "root-error" ], "status": "pass", "method": "Rendered DOM/evaluate plus the cited objective or visual artifact.", "evidence": "The static response has no consent, upsell, pricing, continuity, cancellation, advertisement, or interactive choice.", "artifacts": [ "evidence/home-desktop.png", "evidence/full-probe.json" ] }, { "principleId": "be-trustworthy", "checkId": "humane-error-handling", "confidence": "high", "status": "not-applicable", "method": "Applicability judgement from rendered DOM and interaction inventory.", "evidence": "There is no form or user input to validate.", "reason": "There is no form or user input to validate." }, { "principleId": "be-trustworthy", "checkId": "trustworthy-input-assistance", "confidence": "high", "status": "not-applicable", "method": "Applicability judgement from rendered DOM and interaction inventory.", "evidence": "There are no inputs or account/payment/address fields.", "reason": "There are no inputs or account/payment/address fields." }, { "principleId": "be-trustworthy", "checkId": "safe-commercial-and-account-flows", "confidence": "high", "status": "not-applicable", "method": "Applicability judgement from rendered DOM and interaction inventory.", "evidence": "There is no checkout, subscription, consent, authentication, or account-management flow.", "reason": "There is no checkout, subscription, consent, authentication, or account-management flow." }, { "principleId": "be-sustainable", "checkId": "optimised-assets", "confidence": "high", "pathIds": [ "root-error" ], "status": "pass", "method": "Rendered DOM/evaluate plus the cited objective or visual artifact.", "evidence": "Images primitive found zero images; total transfer is only 34,784 bytes.", "artifacts": [ "evidence/images.json", "evidence/home-summary.json" ] }, { "principleId": "be-sustainable", "checkId": "no-wasteful-work", "confidence": "high", "pathIds": [ "root-error" ], "status": "pass", "method": "Rendered DOM/evaluate plus the cited objective or visual artifact.", "evidence": "Trace found no long tasks and DOM/HAR found no scripts, background processing, or repeated fetches.", "artifacts": [ "evidence/home-trace-summary.json", "evidence/home-summary.json" ] }, { "principleId": "be-sustainable", "checkId": "third-party-and-media-budget", "confidence": "high", "pathIds": [ "root-error" ], "status": "pass", "method": "Rendered DOM/evaluate plus the cited objective or visual artifact.", "evidence": "No media, trackers, or scripts load; two font requests account for 17,866 bytes and total transfer remains 34,784 bytes.", "artifacts": [ "evidence/home-summary.json", "evidence/trackers.json" ] }, { "principleId": "be-agent-ready", "checkId": "structured-agent-capabilities", "confidence": "high", "status": "not-applicable", "method": "Applicability judgement from rendered DOM and interaction inventory.", "evidence": "The observed generic 404 page has no user capability or transaction suitable for agent-tool exposure.", "reason": "The observed generic 404 page has no user capability or transaction suitable for agent-tool exposure." }, { "principleId": "be-agent-ready", "checkId": "on-device-inference", "confidence": "high", "status": "not-applicable", "method": "Applicability judgement from rendered DOM and interaction inventory.", "evidence": "The observed 404 page has no inference or summarisation use case.", "reason": "The observed 404 page has no inference or summarisation use case." }, { "principleId": "be-memory-efficient", "checkId": "no-leak-under-repeated-interaction", "confidence": "high", "status": "not-applicable", "method": "Applicability judgement from rendered DOM and interaction inventory.", "evidence": "The script-free static response has no representative interaction to repeat; fabricating one would not test a real session behavior.", "reason": "The script-free static response has no representative interaction to repeat; fabricating one would not test a real session behavior." }, { "principleId": "be-memory-efficient", "checkId": "bounded-footprint", "confidence": "high", "pathIds": [ "root-error" ], "status": "pass", "method": "Rendered DOM/evaluate plus the cited objective or visual artifact.", "evidence": "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.", "artifacts": [ "evidence/home-heap.json", "evidence/full-probe.json" ] }, { "principleId": "be-memory-efficient", "checkId": "no-detached-dom-or-unbounded-listeners", "confidence": "high", "pathIds": [ "root-error" ], "status": "pass", "method": "Rendered DOM/evaluate plus the cited objective or visual artifact.", "evidence": "Heap summary lists no Detached* constructor population and the page contains no authored JavaScript, event registration, observers, or timers.", "artifacts": [ "evidence/home-heap.json", "evidence/home-dom.json" ] } ], "principleOutcomes": [ { "principleId": "respect-user-preferences", "expectation": "default", "status": "issues", "findingIds": [ "F001" ] }, { "principleId": "implement-natural-interactions", "expectation": "default", "status": "pass" }, { "principleId": "provide-guided-navigation", "expectation": "default", "status": "issues", "findingIds": [ "F002" ] }, { "principleId": "maximize-content-reduce-noise", "expectation": "default", "status": "pass" }, { "principleId": "adapt-to-the-form-factor", "expectation": "default", "status": "pass" }, { "principleId": "support-core-task-success", "expectation": "default", "status": "issues", "findingIds": [ "F003", "F004", "F005" ] }, { "principleId": "be-fast-and-stable", "expectation": "default", "status": "issues", "findingIds": [ "F006" ] }, { "principleId": "be-inclusive", "expectation": "default", "status": "issues", "findingIds": [ "F007" ] }, { "principleId": "follow-best-practices", "expectation": "default", "status": "pass" }, { "principleId": "be-discoverable", "expectation": "default", "status": "issues", "findingIds": [ "F008", "F009", "F010" ] }, { "principleId": "be-private-and-secure", "expectation": "default", "status": "issues", "findingIds": [ "F011", "F012" ] }, { "principleId": "be-resilient", "expectation": "contextual", "status": "issues", "findingIds": [ "F013" ] }, { "principleId": "be-internationalised", "expectation": "contextual", "status": "pass" }, { "principleId": "be-trustworthy", "expectation": "default", "status": "pass" }, { "principleId": "be-sustainable", "expectation": "contextual", "status": "pass" }, { "principleId": "be-agent-ready", "expectation": "contextual", "status": "not-applicable", "reason": "All checks are inapplicable to the observed script-free, non-interactive 404 archetype; check-specific rationales are recorded." }, { "principleId": "be-memory-efficient", "expectation": "default", "status": "pass" } ], "paths": [ { "id": "root-error", "description": "Requested root URL and its server-rendered 404/error archetype. This is the only discoverable page: the DOM has no links, robots.txt lists no routes, and /sitemap.xml returns 404. Authenticated or unlinked routes were not covered because none could be discovered safely.", "url": "https://ela.education.ne.jp/", "conditions": [ "desktop", "viewport: 360x800", "prefers-color-scheme: dark", "prefers-contrast: more", "no JavaScript crawler view" ], "result": "issues" } ], "findings": [ { "id": "F001", "severity": "medium", "confidence": "high", "summary": "The error page ignores the user’s dark color-scheme preference.", "evidence": "The prefers-color-scheme: dark screenshot is pixel-equivalent to the light capture; CSS probe reports no color-scheme, prefers-color-scheme, or light-dark() support.", "suggestedFix": "Declare light and dark schemes at document/root level and use adaptive surface/text tokens, following dark-mode guidance.", "effort": "small", "guidanceId": "dark-mode", "guidanceCategory": "css", "principleId": "respect-user-preferences", "principleCheckId": "respects-color-scheme", "artifacts": [ "evidence/home-dark.png", "evidence/full-probe.json" ], "pathId": "root-error", "url": "https://ela.education.ne.jp/" }, { "id": "F002", "severity": "high", "confidence": "high", "summary": "The 404 state provides no guided route back to useful content.", "evidence": "DOM and screenshots show no link, navigation landmark, home action, search action, or focus destination.", "suggestedFix": "Add a prominent, descriptive link to the service home page and, if available, search or support routes; use semantic navigation and clear attention hierarchy.", "effort": "small", "guidanceId": "scrollability-affordance-hints", "guidanceCategory": "user-experience", "principleId": "provide-guided-navigation", "principleCheckId": "directs-attention", "artifacts": [ "evidence/home-desktop.png", "evidence/full-probe.json" ], "pathId": "root-error", "url": "https://ela.education.ne.jp/" }, { "id": "F003", "severity": "high", "confidence": "high", "summary": "The page identifies a 404 but exposes no primary next action.", "evidence": "First-viewport screenshot shows only “404 Not Found”; evaluate reports interactive=0 and headings=0.", "suggestedFix": "Explain what happened in user language and make “Return to home” the clear primary action.", "effort": "small", "guidanceId": "accessibility", "guidanceCategory": "accessibility", "principleId": "support-core-task-success", "principleCheckId": "clear-purpose-and-primary-action", "artifacts": [ "evidence/home-desktop.png", "evidence/full-probe.json" ], "pathId": "root-error", "url": "https://ela.education.ne.jp/" }, { "id": "F004", "severity": "critical", "confidence": "high", "summary": "The requested public root URL is a dead end rather than a completable primary journey.", "evidence": "The main document returns HTTP 404 and the rendered DOM has zero links, forms, buttons, or other continuation paths.", "suggestedFix": "Restore or redirect the public root to the intended service entry point; keep a recovery-oriented 404 template for genuinely unknown paths.", "effort": "medium", "guidanceId": "html", "guidanceCategory": "html", "principleId": "support-core-task-success", "principleCheckId": "primary-flow-completion", "artifacts": [ "evidence/home-summary.json", "evidence/full-probe.json" ], "pathId": "root-error", "url": "https://ela.education.ne.jp/" }, { "id": "F005", "severity": "high", "confidence": "high", "summary": "The error state has no retry, back, home, search, or support recovery.", "evidence": "The 404 screenshot and DOM show only status text and no actionable recovery control.", "suggestedFix": "Provide explicit recovery actions and preserve enough context to help users continue.", "effort": "small", "guidanceId": "persistent-toast-notifications", "guidanceCategory": "user-experience", "principleId": "support-core-task-success", "principleCheckId": "clear-system-state-and-recovery", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json" ], "pathId": "root-error", "url": "https://ela.education.ne.jp/" }, { "id": "F006", "severity": "medium", "confidence": "high", "summary": "A render-blocking third-party font delays a 13-character error page.", "evidence": "HAR identifies the parser-inserted Google Fonts stylesheet as VeryHigh/render-blocking; stylesheet took 615 ms, font 372 ms, and trace LCP reached 2382 ms despite the tiny page.", "suggestedFix": "Use a system font on the error template or self-host/subset the font with non-blocking loading and a stable fallback; avoid prioritising non-critical font work.", "effort": "small", "guidanceId": "optimize-preload-priority", "guidanceCategory": "performance", "principleId": "be-fast-and-stable", "principleCheckId": "efficient-resource-delivery", "artifacts": [ "evidence/home-summary.json", "evidence/home-trace-summary.json" ], "pathId": "root-error", "url": "https://ela.education.ne.jp/" }, { "id": "F007", "severity": "medium", "confidence": "high", "summary": "The document has no main landmark or heading structure.", "evidence": "Axe reports landmark-one-main, page-has-heading-one, and region violations; DOM probe reports landmarks=[] and headings=[].", "suggestedFix": "Wrap the error content in
and use an

for the user-facing error heading, preserving the concise visual treatment.", "effort": "trivial", "guidanceId": "accessibility", "guidanceCategory": "accessibility", "principleId": "be-inclusive", "principleCheckId": "structure-and-focus", "artifacts": [ "evidence/axe.json", "evidence/full-probe.json" ], "pathId": "root-error", "url": "https://ela.education.ne.jp/" }, { "id": "F008", "severity": "medium", "confidence": "high", "summary": "Metadata is generic and has no description.", "evidence": "Rendered title is only “Not Found” and meta[name=description] is absent.", "suggestedFix": "Use a service-specific error title and concise description that identifies the site and recovery purpose.", "effort": "trivial", "guidanceId": "html", "guidanceCategory": "html", "principleId": "be-discoverable", "principleCheckId": "title-and-description", "artifacts": [ "evidence/full-probe.json" ], "pathId": "root-error", "url": "https://ela.education.ne.jp/" }, { "id": "F009", "severity": "medium", "confidence": "high", "summary": "The error page is mobile-friendly but has no crawlable recovery link.", "evidence": "Viewport metadata and mobile reflow pass, robots allows crawling, but the DOM contains zero anchors.", "suggestedFix": "Add real href-based links with descriptive text to home and other useful public destinations.", "effort": "trivial", "guidanceId": "html", "guidanceCategory": "html", "principleId": "be-discoverable", "principleCheckId": "crawlable-and-mobile-friendly", "artifacts": [ "evidence/full-probe.json", "evidence/robots.json" ], "pathId": "root-error", "url": "https://ela.education.ne.jp/" }, { "id": "F010", "severity": "high", "confidence": "high", "summary": "The public root returns 404 and the host exposes no sitemap at /sitemap.xml.", "evidence": "HAR/discoverability record fetchedStatus=404 for the root; /sitemap.xml also returns the generic 404 response; no canonical URL is present.", "suggestedFix": "Serve the intended root with HTTP 200 (or a deliberate permanent redirect), publish a consistent sitemap for public routes, and add canonical signals where appropriate.", "effort": "medium", "guidanceId": "html", "guidanceCategory": "html", "principleId": "be-discoverable", "principleCheckId": "canonical-and-indexing-signals", "artifacts": [ "evidence/discoverability.json", "evidence/sitemap-response.html" ], "pathId": "root-error", "url": "https://ela.education.ne.jp/" }, { "id": "F011", "severity": "high", "confidence": "high", "summary": "HTTPS is used, but baseline transport/content hardening headers are absent.", "evidence": "Headers primitive finds no Content-Security-Policy, Strict-Transport-Security, or X-Content-Type-Options; all are reported missing.", "suggestedFix": "Add HSTS after confirming HTTPS coverage, a restrictive CSP appropriate to the template, and X-Content-Type-Options: nosniff.", "effort": "small", "guidanceId": "security", "guidanceCategory": "security", "principleId": "be-private-and-secure", "principleCheckId": "secure-transport-and-headers", "artifacts": [ "evidence/headers.json" ], "pathId": "root-error", "url": "https://ela.education.ne.jp/" }, { "id": "F012", "severity": "medium", "confidence": "high", "summary": "Browser-enforced framing, referrer, and permission defenses are not configured.", "evidence": "Headers primitive finds neither frame-ancestors/X-Frame-Options nor Referrer-Policy nor Permissions-Policy.", "suggestedFix": "Set frame-ancestors in CSP (or X-Frame-Options where needed), a conservative Referrer-Policy, and a least-privilege Permissions-Policy.", "effort": "small", "guidanceId": "security", "guidanceCategory": "security", "principleId": "be-private-and-secure", "principleCheckId": "defensive-browser-policies", "artifacts": [ "evidence/headers.json" ], "pathId": "root-error", "url": "https://ela.education.ne.jp/" }, { "id": "F013", "severity": "high", "confidence": "high", "summary": "The network/HTTP failure state is visible but not recoverable.", "evidence": "The observed 404 response renders a bare message with no retry, home, search, support, or diagnostic context.", "suggestedFix": "Build a resilient error template with useful recovery actions and ensure unknown routes return it while the intended root remains available.", "effort": "small", "guidanceId": "conditional-async-dependencies", "guidanceCategory": "javascript", "principleId": "be-resilient", "principleCheckId": "network-and-http-failure-states", "artifacts": [ "evidence/home-desktop.png", "evidence/home-summary.json" ], "pathId": "root-error", "url": "https://ela.education.ne.jp/" } ], "taskList": [ { "id": "T001", "title": "Restore or redirect the public root, then add a recovery-oriented 404 template", "priority": 1, "findingIds": [ "F002", "F003", "F004", "F005", "F009", "F010", "F013" ], "guidanceId": "html", "status": "open" }, { "id": "T002", "title": "Add baseline response security policies", "priority": 2, "findingIds": [ "F011", "F012" ], "guidanceId": "security", "status": "open" }, { "id": "T003", "title": "Make the error document semantic and accessible", "priority": 3, "findingIds": [ "F007", "F008" ], "guidanceId": "accessibility", "status": "open" }, { "id": "T004", "title": "Remove the blocking third-party font from the tiny error template", "priority": 4, "findingIds": [ "F006" ], "guidanceId": "optimize-preload-priority", "status": "open" }, { "id": "T005", "title": "Honor the user color-scheme preference", "priority": 5, "findingIds": [ "F001" ], "guidanceId": "dark-mode", "status": "open" } ], "budget": { "pathCount": 1, "auditPasses": 1 }, "agent": "pi", "runId": "2026-07-22T00-30-18-978Z" }