{ "url": "https://sp.pf.mbga.jp", "auditedAt": "2026-07-21T06:26:14.738Z", "mode": "report", "status": "completed", "statusDetail": "Complete atomic audit of the target missing-page response plus its linked recovery destination. The target exposes one static page archetype; broader sp.mbga.jp content is outside host scope.", "page": { "appType": "mpa", "framework": "none detected", "notes": "The target root is a server-rendered Japanese custom missing-page response. It returns HTTP 200 and offers a cross-host Mobage home recovery link." }, "evidenceUsed": [ "screenshot", "dom", "evaluate-probe", "layout-metrics", "trace", "har", "discoverability", "headers", "cookies", "trackers", "images", "secrets", "heap-summary", "lighthouse", "curl HTTP inspection" ], "guidanceConsulted": [ "dark-mode", "accessibility", "forms", "performance", "security", "privacy", "html", "css", "optimize-image-priority", "break-up-long-tasks", "identify-heavy-scripts", "improve-text-layout-and-legibility", "fluid-scaling", "required-field-feedback", "validate-input-after-interaction", "accessible-error-announcement", "stabilize-reactive-state", "conditional-async-dependencies", "deprioritize-background-fetches", "efficient-background-processing", "webmcp", "agentic-forms", "agentic-javascript-tools", "language-model", "summarizer", "manage-recurring-intervals" ], "artifacts": [ { "type": "other", "path": "evidence/cookies.json", "caption": "Objective evidence captured from the target missing-page response.", "findingIds": [ "F-HEADERS" ] }, { "type": "screenshot", "path": "evidence/dark-reduced.png", "caption": "Target under dark color-scheme and reduced-motion preferences.", "findingIds": [ "F-DARK" ] }, { "type": "screenshot", "path": "evidence/desktop.png", "caption": "Target at 1440x1000 desktop viewport.", "findingIds": [] }, { "type": "screenshot", "path": "evidence/discoverability-crawler.png", "caption": "Objective evidence captured from the target missing-page response.", "findingIds": [] }, { "type": "screenshot", "path": "evidence/discoverability-rendered.png", "caption": "Objective evidence captured from the target missing-page response.", "findingIds": [] }, { "type": "discoverability", "path": "evidence/discoverability.json", "caption": "Objective evidence captured from the target missing-page response.", "findingIds": [] }, { "type": "dom", "path": "evidence/dom.json", "caption": "Objective evidence captured from the target missing-page response.", "findingIds": [] }, { "type": "other", "path": "evidence/headers.json", "caption": "Objective evidence captured from the target missing-page response.", "findingIds": [ "F-HEADERS", "F-POLICIES" ] }, { "type": "heap", "path": "evidence/heap-baseline.heapsnapshot", "caption": "Objective evidence captured from the target missing-page response.", "findingIds": [] }, { "type": "heap", "path": "evidence/heap-post.heapsnapshot", "caption": "Objective evidence captured from the target missing-page response.", "findingIds": [] }, { "type": "screenshot", "path": "evidence/high-contrast.png", "caption": "Objective evidence captured from the target missing-page response.", "findingIds": [] }, { "type": "other", "path": "evidence/images.json", "caption": "Objective evidence captured from the target missing-page response.", "findingIds": [] }, { "type": "layout", "path": "evidence/layout-mobile.json", "caption": "Target at 360x800 mobile viewport.", "findingIds": [] }, { "type": "lighthouse", "path": "evidence/lighthouse.json", "caption": "Objective evidence captured from the target missing-page response.", "findingIds": [ "F-INDEX", "F-STRUCTURE", "F-ZOOM", "F-LANG", "F-META", "F-CRAWL", "F-RESOURCE" ] }, { "type": "screenshot", "path": "evidence/mobile.png", "caption": "Target at 360x800 mobile viewport.", "findingIds": [] }, { "type": "har-summary", "path": "evidence/network-summary.json", "caption": "Objective evidence captured from the target missing-page response.", "findingIds": [ "F-RESOURCE" ] }, { "type": "har", "path": "evidence/network.har", "caption": "Objective evidence captured from the target missing-page response.", "findingIds": [] }, { "type": "dom", "path": "evidence/probe.json", "caption": "Objective evidence captured from the target missing-page response.", "findingIds": [ "F-STRUCTURE", "F-ZOOM", "F-LANG", "F-META", "F-CRAWL", "F-DARK", "F-TARGET" ] }, { "type": "dom", "path": "evidence/recon.json", "caption": "Objective evidence captured from the target missing-page response.", "findingIds": [ "F-INDEX" ] }, { "type": "screenshot", "path": "evidence/recovery-destination.png", "caption": "Mobage home loaded after following the primary recovery link.", "findingIds": [] }, { "type": "other", "path": "evidence/secrets.json", "caption": "Objective evidence captured from the target missing-page response.", "findingIds": [] }, { "type": "trace-summary", "path": "evidence/trace-summary.json", "caption": "Objective evidence captured from the target missing-page response.", "findingIds": [] }, { "type": "trace", "path": "evidence/trace.json", "caption": "Objective evidence captured from the target missing-page response.", "findingIds": [] }, { "type": "other", "path": "evidence/trackers.json", "caption": "Objective evidence captured from the target missing-page response.", "findingIds": [] } ], "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", "status": "issues", "confidence": "high", "method": "Direct screenshot, DOM/evaluate, Lighthouse, or network evidence as listed.", "evidence": "Dark-preference capture is pixel-identical to light: white surface and black text; CSS probe finds no color-scheme or prefers-color-scheme rule.", "pathIds": [ "missing-page" ], "artifacts": [ "evidence/dark-reduced.png", "evidence/probe.json" ], "findingIds": [ "F-DARK" ] }, { "principleId": "respect-user-preferences", "checkId": "respects-reduced-motion", "status": "pass", "confidence": "high", "method": "Direct screenshot, DOM/evaluate, Lighthouse, trace, HAR, discoverability, or heap evidence as listed.", "evidence": "Computed-style probe found zero active animations, so no non-essential motion remains under reduced-motion.", "pathIds": [ "missing-page" ], "artifacts": [ "evidence/probe.json" ] }, { "principleId": "respect-user-preferences", "checkId": "respects-contrast", "status": "pass", "confidence": "high", "method": "Direct screenshot, DOM/evaluate, Lighthouse, trace, HAR, discoverability, or heap evidence as listed.", "evidence": "High-contrast capture keeps the error message, recovery link, and footer controls visible.", "pathIds": [ "missing-page" ], "artifacts": [ "evidence/high-contrast.png" ] }, { "principleId": "implement-natural-interactions", "checkId": "view-transitions", "status": "not-applicable", "confidence": "high", "method": "Recon and rendered DOM applicability review.", "evidence": "This static error document has no same-document or route state transition to animate.", "reason": "This static error document has no same-document or route state transition to animate." }, { "principleId": "implement-natural-interactions", "checkId": "scroll-driven-animations", "status": "not-applicable", "confidence": "high", "method": "Recon and rendered DOM applicability review.", "evidence": "The complete document is 144px tall and has no scroll-linked effect.", "reason": "The complete document is 144px tall and has no scroll-linked effect." }, { "principleId": "implement-natural-interactions", "checkId": "physical-gestures", "status": "pass", "confidence": "high", "method": "Direct screenshot, DOM/evaluate, Lighthouse, trace, HAR, discoverability, or heap evidence as listed.", "evidence": "The page uses native anchors for every interaction and adds only bounded touchstart/touchend pressed-state feedback, with no custom pointermove or gesture handling that fights the platform.", "pathIds": [ "missing-page" ] }, { "principleId": "provide-guided-navigation", "checkId": "scroll-state-aware-chrome", "status": "not-applicable", "confidence": "high", "method": "Recon and rendered DOM applicability review.", "evidence": "The complete document fits within one viewport and has no meaningful scroll state.", "reason": "The complete document fits within one viewport and has no meaningful scroll state." }, { "principleId": "provide-guided-navigation", "checkId": "anchored-positioning", "status": "not-applicable", "confidence": "high", "method": "Recon and rendered DOM applicability review.", "evidence": "No tooltip, popover, or menu overlay exists on this error document.", "reason": "No tooltip, popover, or menu overlay exists on this error document." }, { "principleId": "provide-guided-navigation", "checkId": "directs-attention", "status": "pass", "confidence": "high", "method": "Direct screenshot, DOM/evaluate, Lighthouse, trace, HAR, discoverability, or heap evidence as listed.", "evidence": "The first viewport states the missing-page condition and places a descriptive Mobage home recovery link immediately below it.", "pathIds": [ "missing-page" ], "artifacts": [ "evidence/mobile.png" ] }, { "principleId": "maximize-content-reduce-noise", "checkId": "no-intrusive-interruptions", "status": "pass", "confidence": "high", "method": "Direct screenshot, DOM/evaluate, Lighthouse, trace, HAR, discoverability, or heap evidence as listed.", "evidence": "Load screenshots show no popup, banner, consent wall, or obscuring overlay.", "pathIds": [ "missing-page" ], "artifacts": [ "evidence/mobile.png" ] }, { "principleId": "maximize-content-reduce-noise", "checkId": "semantic-dismissible-primitives", "status": "not-applicable", "confidence": "high", "method": "Recon and rendered DOM applicability review.", "evidence": "No overlay, disclosure, picker, or rich control exists on this error document.", "reason": "No overlay, disclosure, picker, or rich control exists on this error document." }, { "principleId": "maximize-content-reduce-noise", "checkId": "reduced-chrome", "status": "pass", "confidence": "high", "method": "Direct screenshot, DOM/evaluate, Lighthouse, trace, HAR, discoverability, or heap evidence as listed.", "evidence": "The first viewport contains only two short error paragraphs and a compact four-item navigation strip.", "pathIds": [ "missing-page" ], "artifacts": [ "evidence/mobile.png" ] }, { "principleId": "adapt-to-the-form-factor", "checkId": "responsive-no-horizontal-scroll", "status": "pass", "confidence": "high", "method": "Direct screenshot, DOM/evaluate, Lighthouse, trace, HAR, discoverability, or heap evidence as listed.", "evidence": "Layout at 360x800 reports scrollWidth 360, clientWidth 360, horizontalOverflowPx 0, and a viewport meta element.", "pathIds": [ "missing-page" ], "artifacts": [ "evidence/layout-mobile.json", "evidence/mobile.png" ] }, { "principleId": "adapt-to-the-form-factor", "checkId": "component-level-responsiveness", "status": "not-applicable", "confidence": "high", "method": "Recon and rendered DOM applicability review.", "evidence": "The one-off error message and four-link footer are not reused components in differently sized containers.", "reason": "The one-off error message and four-link footer are not reused components in differently sized containers." }, { "principleId": "adapt-to-the-form-factor", "checkId": "input-modality-aware", "status": "issues", "confidence": "high", "method": "Direct screenshot, DOM/evaluate, Lighthouse, or network evidence as listed.", "evidence": "The primary recovery anchor measures 184.4 by 17px, below the 24px minimum target height, although footer targets are 60 by 48px and keyboard focus is visible.", "pathIds": [ "missing-page" ], "artifacts": [ "evidence/probe.json" ], "findingIds": [ "F-TARGET" ] }, { "principleId": "support-core-task-success", "checkId": "clear-purpose-and-primary-action", "status": "pass", "confidence": "high", "method": "Direct screenshot, DOM/evaluate, Lighthouse, trace, HAR, discoverability, or heap evidence as listed.", "evidence": "The first line says the page does not exist and the next line offers a clearly labelled move-to-Mobage-top action.", "pathIds": [ "missing-page" ], "artifacts": [ "evidence/mobile.png" ] }, { "principleId": "support-core-task-success", "checkId": "primary-flow-completion", "status": "pass", "confidence": "high", "method": "Direct screenshot, DOM/evaluate, Lighthouse, trace, HAR, discoverability, or heap evidence as listed.", "evidence": "Following the recovery destination loads the Mobage home page with news and game navigation.", "pathIds": [ "missing-page" ], "artifacts": [ "evidence/recovery-destination.png" ] }, { "principleId": "support-core-task-success", "checkId": "clear-system-state-and-recovery", "status": "pass", "confidence": "high", "method": "Direct screenshot, DOM/evaluate, Lighthouse, trace, HAR, discoverability, or heap evidence as listed.", "evidence": "The missing state is visible as text and provides both a direct home recovery link and four navigation alternatives.", "pathIds": [ "missing-page" ], "artifacts": [ "evidence/mobile.png" ] }, { "principleId": "be-fast-and-stable", "checkId": "good-core-web-vitals", "status": "pass", "confidence": "high", "method": "Direct screenshot, DOM/evaluate, Lighthouse, trace, HAR, discoverability, or heap evidence as listed.", "evidence": "Trace measured LCP 1494.61ms, CLS 0, and TBT 0ms; Lighthouse measured LCP 2.2s, CLS 0, and TBT 0ms.", "pathIds": [ "missing-page" ], "artifacts": [ "evidence/trace-summary.json", "evidence/lighthouse.json" ] }, { "principleId": "be-fast-and-stable", "checkId": "visual-stability", "status": "pass", "confidence": "high", "method": "Direct screenshot, DOM/evaluate, Lighthouse, trace, HAR, discoverability, or heap evidence as listed.", "evidence": "The layout observer recorded CLS 0 with no layout shifts.", "pathIds": [ "missing-page" ], "artifacts": [ "evidence/layout-mobile.json" ] }, { "principleId": "be-fast-and-stable", "checkId": "efficient-main-thread", "status": "pass", "confidence": "high", "method": "Direct screenshot, DOM/evaluate, Lighthouse, trace, HAR, discoverability, or heap evidence as listed.", "evidence": "Trace and layout evidence recorded no long tasks and total blocking time of 0ms.", "pathIds": [ "missing-page" ], "artifacts": [ "evidence/trace-summary.json" ] }, { "principleId": "be-fast-and-stable", "checkId": "efficient-resource-delivery", "status": "issues", "confidence": "high", "method": "Direct screenshot, DOM/evaluate, Lighthouse, or network evidence as listed.", "evidence": "HAR identifies the parser-inserted base.css as VeryHigh-priority render-blocking; Lighthouse estimates 730ms savings and the document TTFB was 734ms.", "pathIds": [ "missing-page" ], "artifacts": [ "evidence/network-summary.json", "evidence/lighthouse.json" ], "findingIds": [ "F-RESOURCE" ] }, { "principleId": "be-fast-and-stable", "checkId": "trim-unused-and-duplicate-code", "status": "pass", "confidence": "high", "method": "Direct screenshot, DOM/evaluate, Lighthouse, trace, HAR, discoverability, or heap evidence as listed.", "evidence": "HAR records only 4 requests and 43,435 transferred bytes with no external JavaScript; Lighthouse best-practices scored 1.0.", "pathIds": [ "missing-page" ], "artifacts": [ "evidence/network-summary.json", "evidence/lighthouse.json" ] }, { "principleId": "be-inclusive", "checkId": "names-roles-labels", "status": "pass", "confidence": "high", "method": "Direct screenshot, DOM/evaluate, Lighthouse, trace, HAR, discoverability, or heap evidence as listed.", "evidence": "All five interactive elements are native anchors with visible names; there are no images or form controls requiring additional alternatives.", "pathIds": [ "missing-page" ], "artifacts": [ "evidence/probe.json", "evidence/lighthouse.json" ] }, { "principleId": "be-inclusive", "checkId": "sufficient-contrast", "status": "pass", "confidence": "high", "method": "Direct screenshot, DOM/evaluate, Lighthouse, trace, HAR, discoverability, or heap evidence as listed.", "evidence": "Lighthouse reported no color-contrast failure, and standard/high-contrast screenshots keep text and controls legible.", "pathIds": [ "missing-page" ], "artifacts": [ "evidence/lighthouse.json", "evidence/high-contrast.png" ] }, { "principleId": "be-inclusive", "checkId": "structure-and-focus", "status": "issues", "confidence": "high", "method": "Direct screenshot, DOM/evaluate, Lighthouse, or network evidence as listed.", "evidence": "DOM has no heading and no main, nav, header, or footer landmark; Lighthouse fails landmark-one-main.", "pathIds": [ "missing-page" ], "artifacts": [ "evidence/probe.json", "evidence/lighthouse.json" ], "findingIds": [ "F-STRUCTURE" ] }, { "principleId": "be-inclusive", "checkId": "legible-text", "status": "pass", "confidence": "high", "method": "Direct screenshot, DOM/evaluate, Lighthouse, trace, HAR, discoverability, or heap evidence as listed.", "evidence": "Mobile and desktop captures show unclipped Japanese text with adequate whitespace and no cramped wrapping.", "pathIds": [ "missing-page" ], "artifacts": [ "evidence/mobile.png", "evidence/desktop.png" ] }, { "principleId": "be-inclusive", "checkId": "zoom-reflow-targets-and-media", "status": "issues", "confidence": "high", "method": "Direct screenshot, DOM/evaluate, Lighthouse, or network evidence as listed.", "evidence": "Viewport declares maximum-scale=1.0 and user-scalable=no; Lighthouse fails its zoom accessibility audit.", "pathIds": [ "missing-page" ], "artifacts": [ "evidence/probe.json", "evidence/lighthouse.json" ], "findingIds": [ "F-ZOOM" ] }, { "principleId": "follow-best-practices", "checkId": "no-console-errors", "status": "pass", "confidence": "high", "method": "Direct screenshot, DOM/evaluate, Lighthouse, trace, HAR, discoverability, or heap evidence as listed.", "evidence": "Lighthouse best-practices scored 1.0 and reported no browser error audit failure.", "pathIds": [ "missing-page" ], "artifacts": [ "evidence/lighthouse.json" ] }, { "principleId": "follow-best-practices", "checkId": "sound-document-and-assets", "status": "pass", "confidence": "high", "method": "Direct screenshot, DOM/evaluate, Lighthouse, trace, HAR, discoverability, or heap evidence as listed.", "evidence": "DOM probe confirms HTML doctype and UTF-8 charset; there are no img elements with sizing or aspect-ratio defects.", "pathIds": [ "missing-page" ], "artifacts": [ "evidence/probe.json", "evidence/images.json" ] }, { "principleId": "follow-best-practices", "checkId": "browser-platform-hygiene", "status": "pass", "confidence": "high", "method": "Direct screenshot, DOM/evaluate, Lighthouse, trace, HAR, discoverability, or heap evidence as listed.", "evidence": "Lighthouse best-practices scored 1.0; the probe found no form paste handlers and both permission states remained prompt rather than being requested.", "pathIds": [ "missing-page" ], "artifacts": [ "evidence/lighthouse.json", "evidence/probe.json" ] }, { "principleId": "be-discoverable", "checkId": "title-and-description", "status": "issues", "confidence": "high", "method": "Direct screenshot, DOM/evaluate, Lighthouse, or network evidence as listed.", "evidence": "Title is only モバゲー, which does not identify the missing-page state, and meta description is absent; Lighthouse SEO score is 0.82.", "pathIds": [ "missing-page" ], "artifacts": [ "evidence/probe.json", "evidence/lighthouse.json" ], "findingIds": [ "F-META" ] }, { "principleId": "be-discoverable", "checkId": "crawlable-and-mobile-friendly", "status": "issues", "confidence": "high", "method": "Direct screenshot, DOM/evaluate, Lighthouse, or network evidence as listed.", "evidence": "The viewport disables zoom and /robots.txt returns the same HTML missing-page body; Lighthouse reports robots.txt invalid with 58 errors.", "pathIds": [ "missing-page" ], "artifacts": [ "evidence/probe.json", "evidence/lighthouse.json" ], "findingIds": [ "F-CRAWL" ] }, { "principleId": "be-discoverable", "checkId": "canonical-and-indexing-signals", "status": "issues", "confidence": "high", "method": "Direct screenshot, DOM/evaluate, Lighthouse, or network evidence as listed.", "evidence": "A nonexistent root, /robots.txt, and /sitemap.xml all return HTTP 200 HTML; the page has no canonical or robots directive, creating soft-404 and indexing ambiguity.", "pathIds": [ "missing-page" ], "artifacts": [ "evidence/recon.json", "evidence/lighthouse.json" ], "findingIds": [ "F-INDEX" ] }, { "principleId": "be-discoverable", "checkId": "structured-and-shareable-metadata", "status": "not-applicable", "confidence": "high", "method": "Recon and rendered DOM applicability review.", "evidence": "This is a generic missing-page response, not an article, product, event, organization, or other rich entity.", "reason": "This is a generic missing-page response, not an article, product, event, organization, or other rich entity." }, { "principleId": "be-private-and-secure", "checkId": "secure-transport-and-headers", "status": "issues", "confidence": "high", "method": "Direct screenshot, DOM/evaluate, Lighthouse, or network evidence as listed.", "evidence": "The document uses HTTPS and sets no cookies, but headers evidence finds no CSP, HSTS, or X-Content-Type-Options.", "pathIds": [ "missing-page" ], "artifacts": [ "evidence/headers.json", "evidence/cookies.json" ], "findingIds": [ "F-HEADERS" ] }, { "principleId": "be-private-and-secure", "checkId": "data-minimisation-and-third-parties", "status": "pass", "confidence": "high", "method": "Direct screenshot, DOM/evaluate, Lighthouse, trace, HAR, discoverability, or heap evidence as listed.", "evidence": "Network evidence found 4 requests, no cookies, no known trackers, no exposed secrets, and only one related static-asset origin.", "pathIds": [ "missing-page" ], "artifacts": [ "evidence/network-summary.json", "evidence/trackers.json", "evidence/secrets.json", "evidence/cookies.json" ] }, { "principleId": "be-private-and-secure", "checkId": "in-context-permissions-and-modern-auth", "status": "not-applicable", "confidence": "high", "method": "Recon and rendered DOM applicability review.", "evidence": "This error document has no authentication flow and requests no browser permission.", "reason": "This error document has no authentication flow and requests no browser permission." }, { "principleId": "be-private-and-secure", "checkId": "defensive-browser-policies", "status": "issues", "confidence": "high", "method": "Direct screenshot, DOM/evaluate, Lighthouse, or network evidence as listed.", "evidence": "Headers evidence finds no frame-ancestors/X-Frame-Options, Referrer-Policy, or Permissions-Policy.", "pathIds": [ "missing-page" ], "artifacts": [ "evidence/headers.json" ], "findingIds": [ "F-POLICIES" ] }, { "principleId": "be-resilient", "checkId": "progressive-enhancement", "status": "pass", "confidence": "high", "method": "Direct screenshot, DOM/evaluate, Lighthouse, trace, HAR, discoverability, or heap evidence as listed.", "evidence": "Raw server HTML contains the full visible error text and links; the page is not a JavaScript shell.", "pathIds": [ "missing-page" ], "artifacts": [ "evidence/discoverability.json", "evidence/discoverability-crawler.png" ] }, { "principleId": "be-resilient", "checkId": "resilient-runtime-behaviour", "status": "pass", "confidence": "high", "method": "Direct screenshot, DOM/evaluate, Lighthouse, trace, HAR, discoverability, or heap evidence as listed.", "evidence": "The page has no overlays or asynchronous dependencies; all recovery links have real href values and the tested home destination loaded.", "pathIds": [ "missing-page" ], "artifacts": [ "evidence/recovery-destination.png" ] }, { "principleId": "be-resilient", "checkId": "offline-and-installable", "status": "not-applicable", "confidence": "high", "method": "Recon and rendered DOM applicability review.", "evidence": "This small cross-site recovery document is not an app-like surface for which installation is a meaningful task.", "reason": "This small cross-site recovery document is not an app-like surface for which installation is a meaningful task." }, { "principleId": "be-resilient", "checkId": "network-and-http-failure-states", "status": "pass", "confidence": "high", "method": "Direct screenshot, DOM/evaluate, Lighthouse, trace, HAR, discoverability, or heap evidence as listed.", "evidence": "The missing-page state is rendered as readable text with a direct home link and four alternate navigation choices.", "pathIds": [ "missing-page" ], "artifacts": [ "evidence/mobile.png" ] }, { "principleId": "be-internationalised", "checkId": "lang-dir-and-logical-properties", "status": "issues", "confidence": "high", "method": "Direct screenshot, DOM/evaluate, Lighthouse, or network evidence as listed.", "evidence": "The Japanese document has an empty html lang attribute and no dir; Lighthouse fails html-has-lang.", "pathIds": [ "missing-page" ], "artifacts": [ "evidence/probe.json", "evidence/lighthouse.json" ], "findingIds": [ "F-LANG" ] }, { "principleId": "be-internationalised", "checkId": "locale-aware-data", "status": "not-applicable", "confidence": "high", "method": "Recon and rendered DOM applicability review.", "evidence": "The page renders no date, number, currency, duration, or calendar data.", "reason": "The page renders no date, number, currency, duration, or calendar data." }, { "principleId": "be-internationalised", "checkId": "time-zone-correctness", "status": "not-applicable", "confidence": "high", "method": "Recon and rendered DOM applicability review.", "evidence": "The page contains no time or event data.", "reason": "The page contains no time or event data." }, { "principleId": "be-trustworthy", "checkId": "no-dark-patterns", "status": "pass", "confidence": "high", "method": "Direct screenshot, DOM/evaluate, Lighthouse, trace, HAR, discoverability, or heap evidence as listed.", "evidence": "Screenshots and DOM show no consent wall, upsell, forced continuity, disguised action, or deceptive default.", "pathIds": [ "missing-page" ], "artifacts": [ "evidence/mobile.png" ] }, { "principleId": "be-trustworthy", "checkId": "humane-error-handling", "status": "not-applicable", "confidence": "high", "method": "Recon and rendered DOM applicability review.", "evidence": "There is no user-input form on this error document.", "reason": "There is no user-input form on this error document." }, { "principleId": "be-trustworthy", "checkId": "trustworthy-input-assistance", "status": "not-applicable", "confidence": "high", "method": "Recon and rendered DOM applicability review.", "evidence": "There are no input fields on this error document.", "reason": "There are no input fields on this error document." }, { "principleId": "be-trustworthy", "checkId": "safe-commercial-and-account-flows", "status": "not-applicable", "confidence": "high", "method": "Recon and rendered DOM applicability review.", "evidence": "No checkout, subscription, consent, authentication, or account-management flow is present.", "reason": "No checkout, subscription, consent, authentication, or account-management flow is present." }, { "principleId": "be-sustainable", "checkId": "optimised-assets", "status": "pass", "confidence": "high", "method": "Direct screenshot, DOM/evaluate, Lighthouse, trace, HAR, discoverability, or heap evidence as listed.", "evidence": "The whole page transfers 43,435 bytes; its only visual asset is a shared 37,014-byte navigation sprite.", "pathIds": [ "missing-page" ], "artifacts": [ "evidence/network-summary.json" ] }, { "principleId": "be-sustainable", "checkId": "no-wasteful-work", "status": "pass", "confidence": "high", "method": "Direct screenshot, DOM/evaluate, Lighthouse, trace, HAR, discoverability, or heap evidence as listed.", "evidence": "HAR records four requests and no external JavaScript, trackers, autoplay media, or background fetching.", "pathIds": [ "missing-page" ], "artifacts": [ "evidence/network-summary.json", "evidence/trackers.json" ] }, { "principleId": "be-sustainable", "checkId": "third-party-and-media-budget", "status": "pass", "confidence": "high", "method": "Direct screenshot, DOM/evaluate, Lighthouse, trace, HAR, discoverability, or heap evidence as listed.", "evidence": "There is no audio, video, animation, font, tracker, or third-party script; the related asset host contributes a small CSS file and sprite.", "pathIds": [ "missing-page" ], "artifacts": [ "evidence/network-summary.json" ] }, { "principleId": "be-agent-ready", "checkId": "structured-agent-capabilities", "status": "not-applicable", "confidence": "high", "method": "Recon and rendered DOM applicability review.", "evidence": "This generic missing-page response has no agent-facing task or capability to expose.", "reason": "This generic missing-page response has no agent-facing task or capability to expose." }, { "principleId": "be-agent-ready", "checkId": "on-device-inference", "status": "not-applicable", "confidence": "high", "method": "Recon and rendered DOM applicability review.", "evidence": "This short static error response has no inference use case.", "reason": "This short static error response has no inference use case." }, { "principleId": "be-memory-efficient", "checkId": "no-leak-under-repeated-interaction", "status": "pass", "confidence": "high", "method": "Direct screenshot, DOM/evaluate, Lighthouse, trace, HAR, discoverability, or heap evidence as listed.", "evidence": "After ten touchstart/touchend cycles across each footer item, heap self size differed by only 1,052 bytes and node count by 90 between isolated captures, with no unbounded signal.", "pathIds": [ "missing-page" ], "artifacts": [ "evidence/heap-baseline.heapsnapshot", "evidence/heap-post.heapsnapshot" ] }, { "principleId": "be-memory-efficient", "checkId": "bounded-footprint", "status": "pass", "confidence": "high", "method": "Direct screenshot, DOM/evaluate, Lighthouse, trace, HAR, discoverability, or heap evidence as listed.", "evidence": "Baseline heap is proportionate for the page: 29,158 nodes in the V8 snapshot graph and 936,147 bytes total self size.", "pathIds": [ "missing-page" ], "artifacts": [ "evidence/heap-baseline.heapsnapshot" ] }, { "principleId": "be-memory-efficient", "checkId": "no-detached-dom-or-unbounded-listeners", "status": "pass", "confidence": "high", "method": "Direct screenshot, DOM/evaluate, Lighthouse, trace, HAR, discoverability, or heap evidence as listed.", "evidence": "Ten repeated footer touch cycles produced only a 0.11% self-size difference and 0.31% node-count difference; no accumulating timer or detached-DOM behavior was observed.", "pathIds": [ "missing-page" ], "artifacts": [ "evidence/heap-baseline.heapsnapshot", "evidence/heap-post.heapsnapshot" ] } ], "principleOutcomes": [ { "principleId": "respect-user-preferences", "expectation": "default", "status": "issues", "findingIds": [ "F-DARK" ] }, { "principleId": "implement-natural-interactions", "expectation": "default", "status": "pass" }, { "principleId": "provide-guided-navigation", "expectation": "default", "status": "pass" }, { "principleId": "maximize-content-reduce-noise", "expectation": "default", "status": "pass" }, { "principleId": "adapt-to-the-form-factor", "expectation": "default", "status": "issues", "findingIds": [ "F-TARGET" ] }, { "principleId": "support-core-task-success", "expectation": "default", "status": "pass" }, { "principleId": "be-fast-and-stable", "expectation": "default", "status": "issues", "findingIds": [ "F-RESOURCE" ] }, { "principleId": "be-inclusive", "expectation": "default", "status": "issues", "findingIds": [ "F-STRUCTURE", "F-ZOOM" ] }, { "principleId": "follow-best-practices", "expectation": "default", "status": "pass" }, { "principleId": "be-discoverable", "expectation": "default", "status": "issues", "findingIds": [ "F-META", "F-CRAWL", "F-INDEX" ] }, { "principleId": "be-private-and-secure", "expectation": "default", "status": "issues", "findingIds": [ "F-HEADERS", "F-POLICIES" ] }, { "principleId": "be-resilient", "expectation": "contextual", "status": "pass" }, { "principleId": "be-internationalised", "expectation": "contextual", "status": "issues", "findingIds": [ "F-LANG" ] }, { "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 contextual and inapplicable to this static missing-page response." }, { "principleId": "be-memory-efficient", "expectation": "default", "status": "pass" } ], "paths": [ { "id": "missing-page", "description": "Target root custom missing-page archetype and its primary recovery journey to Mobage home. No other same-host page archetype was discoverable: robots.txt and sitemap.xml repeat the same response. The broader sp.mbga.jp host is excluded except as the recovery destination.", "url": "https://sp.pf.mbga.jp/", "conditions": [ "desktop 1440x1000", "mobile 360x800", "prefers-color-scheme: dark", "prefers-reduced-motion: reduce", "prefers-contrast: more", "keyboard focus", "raw HTML without JavaScript", "repeated footer touch interaction" ], "result": "issues" } ], "findings": [ { "id": "F-INDEX", "severity": "high", "confidence": "high", "principleId": "be-discoverable", "principleCheckId": "canonical-and-indexing-signals", "guidanceId": "html", "guidanceCategory": "html", "summary": "Missing resources return HTTP 200 and lack indexing signals", "evidence": "The root says the page does not exist while the document, /robots.txt, and /sitemap.xml all return HTTP 200 HTML; no canonical or robots directive exists.", "suggestedFix": "Return a real 404 or 410 for missing resources. Serve valid robots.txt and sitemap.xml content, and add deliberate canonical/indexing directives where appropriate.", "effort": "medium", "pathId": "missing-page", "url": "https://sp.pf.mbga.jp/", "artifacts": [ "evidence/recon.json", "evidence/lighthouse.json" ] }, { "id": "F-HEADERS", "severity": "medium", "confidence": "high", "principleId": "be-private-and-secure", "principleCheckId": "secure-transport-and-headers", "guidanceId": "security", "guidanceCategory": "security", "summary": "Core transport security headers are absent", "evidence": "Headers evidence confirms HTTPS but no CSP, HSTS, or X-Content-Type-Options; cookies evidence finds no cookies.", "suggestedFix": "Add an HSTS policy, a restrictive CSP appropriate to the inline footer script, and X-Content-Type-Options: nosniff.", "effort": "small", "pathId": "missing-page", "url": "https://sp.pf.mbga.jp/", "artifacts": [ "evidence/headers.json", "evidence/cookies.json" ] }, { "id": "F-POLICIES", "severity": "medium", "confidence": "high", "principleId": "be-private-and-secure", "principleCheckId": "defensive-browser-policies", "guidanceId": "security", "guidanceCategory": "security", "summary": "Browser defensive policies are not configured", "evidence": "The response has neither frame-ancestors/X-Frame-Options nor Referrer-Policy or Permissions-Policy.", "suggestedFix": "Add frame-ancestors or X-Frame-Options, a strict Referrer-Policy, and a minimal Permissions-Policy.", "effort": "small", "pathId": "missing-page", "url": "https://sp.pf.mbga.jp/", "artifacts": [ "evidence/headers.json" ] }, { "id": "F-STRUCTURE", "severity": "medium", "confidence": "high", "principleId": "be-inclusive", "principleCheckId": "structure-and-focus", "guidanceId": "accessibility", "guidanceCategory": "accessibility", "summary": "The error page has no semantic structure", "evidence": "The DOM has no heading and no landmarks; Lighthouse fails landmark-one-main.", "suggestedFix": "Wrap the error content in main, use an h1 for the missing-page message, and mark the global links as nav with a label.", "effort": "small", "pathId": "missing-page", "url": "https://sp.pf.mbga.jp/", "artifacts": [ "evidence/probe.json", "evidence/lighthouse.json" ] }, { "id": "F-ZOOM", "severity": "medium", "confidence": "high", "principleId": "be-inclusive", "principleCheckId": "zoom-reflow-targets-and-media", "guidanceId": "accessibility", "guidanceCategory": "accessibility", "summary": "The viewport prevents user zoom", "evidence": "The viewport sets maximum-scale=1.0 and user-scalable=no; Lighthouse flags this as an accessibility failure.", "suggestedFix": "Remove maximum-scale and user-scalable restrictions so users can pinch zoom while retaining responsive layout.", "effort": "trivial", "pathId": "missing-page", "url": "https://sp.pf.mbga.jp/", "artifacts": [ "evidence/probe.json", "evidence/lighthouse.json" ] }, { "id": "F-LANG", "severity": "medium", "confidence": "high", "principleId": "be-internationalised", "principleCheckId": "lang-dir-and-logical-properties", "guidanceId": "html", "guidanceCategory": "html", "summary": "The Japanese document does not declare its language", "evidence": "The html element has no lang value and Lighthouse fails html-has-lang.", "suggestedFix": "Set lang=\"ja\" on html and keep direction inherited unless a localized variant requires dir=\"rtl\".", "effort": "trivial", "pathId": "missing-page", "url": "https://sp.pf.mbga.jp/", "artifacts": [ "evidence/probe.json", "evidence/lighthouse.json" ] }, { "id": "F-META", "severity": "medium", "confidence": "high", "principleId": "be-discoverable", "principleCheckId": "title-and-description", "guidanceId": "html", "guidanceCategory": "html", "summary": "The title and description do not describe the missing page", "evidence": "The title is only モバゲー and no meta description is present.", "suggestedFix": "Use a descriptive title such as ページが見つかりません | モバゲー and add a concise description where this response may be indexed or shared.", "effort": "trivial", "pathId": "missing-page", "url": "https://sp.pf.mbga.jp/", "artifacts": [ "evidence/probe.json", "evidence/lighthouse.json" ] }, { "id": "F-CRAWL", "severity": "medium", "confidence": "high", "principleId": "be-discoverable", "principleCheckId": "crawlable-and-mobile-friendly", "guidanceId": "accessibility", "guidanceCategory": "accessibility", "summary": "Robots and mobile-friendly signals are malformed", "evidence": "The page disables zoom, and /robots.txt serves the same HTML error response; Lighthouse reports 58 robots.txt errors.", "suggestedFix": "Serve a valid text/plain robots.txt and remove viewport zoom restrictions. Keep the existing real href links and descriptive recovery text.", "effort": "small", "pathId": "missing-page", "url": "https://sp.pf.mbga.jp/", "artifacts": [ "evidence/probe.json", "evidence/lighthouse.json" ] }, { "id": "F-DARK", "severity": "medium", "confidence": "high", "principleId": "respect-user-preferences", "principleCheckId": "respects-color-scheme", "guidanceId": "dark-mode", "guidanceCategory": "user-experience", "summary": "The page ignores the user dark-theme preference", "evidence": "Dark-mode capture remains white with black text, and CSS inspection finds no color-scheme or prefers-color-scheme support.", "suggestedFix": "Declare color-scheme: light dark and use system colors or light-dark() for page surfaces and text, while preserving the branded navigation contrast.", "effort": "small", "pathId": "missing-page", "url": "https://sp.pf.mbga.jp/", "artifacts": [ "evidence/dark-reduced.png", "evidence/probe.json" ] }, { "id": "F-TARGET", "severity": "low", "confidence": "high", "principleId": "adapt-to-the-form-factor", "principleCheckId": "input-modality-aware", "guidanceId": "accessibility", "guidanceCategory": "accessibility", "summary": "The primary recovery link has a short touch target", "evidence": "The primary link box is 184.4 by 17px, while footer links are 60 by 48px and keyboard focus is visible.", "suggestedFix": "Give the recovery link inline padding or an inline-block button treatment so its target is at least 24px high, ideally 44px on this mobile-first page.", "effort": "trivial", "pathId": "missing-page", "url": "https://sp.pf.mbga.jp/", "artifacts": [ "evidence/probe.json" ] }, { "id": "F-RESOURCE", "severity": "low", "confidence": "high", "principleId": "be-fast-and-stable", "principleCheckId": "efficient-resource-delivery", "guidanceId": "performance", "guidanceCategory": "performance", "summary": "A tiny error page waits on a render-blocking stylesheet", "evidence": "HAR marks base.css parser-inserted at VeryHigh priority; Lighthouse estimates 730ms render-blocking savings, though LCP remains within the good range.", "suggestedFix": "Inline the small critical styles for this error response or split/defer noncritical shared footer CSS while preserving cache reuse.", "effort": "small", "pathId": "missing-page", "url": "https://sp.pf.mbga.jp/", "artifacts": [ "evidence/network-summary.json", "evidence/lighthouse.json" ] } ], "taskList": [ { "id": "T1", "title": "Return correct missing-resource status and valid crawl-control files", "priority": 1, "guidanceId": "html", "findingIds": [ "F-INDEX", "F-CRAWL" ], "status": "open" }, { "id": "T2", "title": "Add core security and browser policy headers", "priority": 2, "guidanceId": "security", "findingIds": [ "F-HEADERS", "F-POLICIES" ], "status": "open" }, { "id": "T3", "title": "Restore semantic structure, language, zoom, and touch sizing", "priority": 3, "guidanceId": "accessibility", "findingIds": [ "F-STRUCTURE", "F-ZOOM", "F-LANG", "F-TARGET" ], "status": "open" }, { "id": "T4", "title": "Add descriptive missing-page metadata", "priority": 4, "guidanceId": "html", "findingIds": [ "F-META" ], "status": "open" }, { "id": "T5", "title": "Respect the user color-scheme preference", "priority": 5, "guidanceId": "dark-mode", "findingIds": [ "F-DARK" ], "status": "open" }, { "id": "T6", "title": "Remove the avoidable render-blocking chain", "priority": 6, "guidanceId": "performance", "findingIds": [ "F-RESOURCE" ], "status": "open" } ], "budget": { "pathCount": 1, "auditPasses": 1 }, "agent": "pi", "runId": "2026-07-21T06-26-14-738Z" }