{ "url": "https://www.nikkei.com", "auditedAt": "2026-07-20T05:52:43.612Z", "mode": "report", "status": "completed", "statusDetail": "Coverage-complete audit of six representative public paths/templates. Excluded: subscriber checkout/cancellation and post-login account states because credentials/purchase authorization were unavailable; no claims are made about those deeper authenticated states.", "page": { "appType": "mpa", "framework": "Unknown / server-rendered component system", "notes": "Japanese subscription news site with server HTML, client enhancement, paywalled articles, search, market data, and third-party consent/tracking." }, "evidenceUsed": [ "screenshot", "dom", "evaluate-probe", "layout-metrics", "trace", "har", "discoverability", "headers", "cookies", "trackers", "images", "secrets", "heap-summary", "lighthouse", "robots/sitemap" ], "guidanceConsulted": [ "dark-mode", "accessibility", "same-document-transitions", "cross-document-transitions", "shrinking-header-on-scroll", "light-dismiss-a-dialog", "declarative-dialog-popover-control", "fluid-scaling", "size-aware-styling", "forms", "performance", "optimize-image-priority", "identify-heavy-scripts", "html", "security", "privacy", "stabilize-reactive-state", "translator", "adapt-scrollbar-to-contrast-preferences", "deliver-optimized-decorative-images", "deprioritize-background-fetches", "manage-recurring-intervals", "webmcp" ], "artifacts": [ { "type": "other", "path": "evidence/a11y-interaction-probe.json", "caption": "a11y interaction probe.json", "findingIds": [ "F-implement-natural-interactions-view-transitions", "F-maximize-content-reduce-noise-semantic-dismissible-primitives", "F-adapt-to-the-form-factor-component-level-responsiveness", "F-adapt-to-the-form-factor-input-modality-aware", "F-be-inclusive-names-roles-labels" ] }, { "type": "screenshot", "path": "evidence/article-desktop.png", "caption": "article desktop.png", "findingIds": [] }, { "type": "screenshot", "path": "evidence/article-discoverability-crawler.png", "caption": "article discoverability crawler.png", "findingIds": [ "F-be-resilient-progressive-enhancement" ] }, { "type": "screenshot", "path": "evidence/article-discoverability-rendered.png", "caption": "article discoverability rendered.png", "findingIds": [ "F-be-resilient-progressive-enhancement" ] }, { "type": "discoverability", "path": "evidence/article-discoverability.json", "caption": "article discoverability.json", "findingIds": [ "F-be-resilient-progressive-enhancement" ] }, { "type": "dom", "path": "evidence/article-dom.json", "caption": "article dom.json", "findingIds": [] }, { "type": "other", "path": "evidence/article-links.json", "caption": "article links.json", "findingIds": [] }, { "type": "other", "path": "evidence/cookies.json", "caption": "cookies.json", "findingIds": [ "F-be-private-and-secure-secure-transport-and-headers" ] }, { "type": "other", "path": "evidence/headers.json", "caption": "headers.json", "findingIds": [ "F-be-private-and-secure-secure-transport-and-headers" ] }, { "type": "heap", "path": "evidence/heap-baseline.json", "caption": "heap baseline.json", "findingIds": [ "F-be-memory-efficient-no-leak-under-repeated-interaction", "F-be-memory-efficient-bounded-footprint" ] }, { "type": "heap", "path": "evidence/heap-post.json", "caption": "heap post.json", "findingIds": [ "F-be-memory-efficient-no-leak-under-repeated-interaction" ] }, { "type": "screenshot", "path": "evidence/home-dark.png", "caption": "home dark.png", "findingIds": [ "F-respect-user-preferences-respects-color-scheme" ] }, { "type": "screenshot", "path": "evidence/home-desktop.png", "caption": "home desktop.png", "findingIds": [ "F-implement-natural-interactions-view-transitions", "F-maximize-content-reduce-noise-no-intrusive-interruptions", "F-maximize-content-reduce-noise-semantic-dismissible-primitives", "F-be-private-and-secure-data-minimisation-and-third-parties" ] }, { "type": "screenshot", "path": "evidence/home-discoverability-crawler.png", "caption": "home discoverability crawler.png", "findingIds": [] }, { "type": "screenshot", "path": "evidence/home-discoverability-rendered.png", "caption": "home discoverability rendered.png", "findingIds": [] }, { "type": "discoverability", "path": "evidence/home-discoverability.json", "caption": "home discoverability.json", "findingIds": [] }, { "type": "dom", "path": "evidence/home-dom.json", "caption": "home dom.json", "findingIds": [] }, { "type": "layout", "path": "evidence/home-mobile-layout.json", "caption": "home mobile layout.json", "findingIds": [ "F-be-inclusive-zoom-reflow-targets-and-media" ] }, { "type": "screenshot", "path": "evidence/home-mobile.png", "caption": "home mobile.png", "findingIds": [ "F-maximize-content-reduce-noise-no-intrusive-interruptions", "F-adapt-to-the-form-factor-component-level-responsiveness", "F-be-inclusive-zoom-reflow-targets-and-media" ] }, { "type": "other", "path": "evidence/home-recon.json", "caption": "home recon.json", "findingIds": [ "F-be-discoverable-crawlable-and-mobile-friendly", "F-be-private-and-secure-secure-transport-and-headers" ] }, { "type": "har-summary", "path": "evidence/home-summary.json", "caption": "home summary.json", "findingIds": [ "F-be-fast-and-stable-efficient-resource-delivery", "F-be-fast-and-stable-trim-unused-and-duplicate-code", "F-follow-best-practices-no-console-errors", "F-be-private-and-secure-data-minimisation-and-third-parties", "F-be-sustainable-optimised-assets", "F-be-sustainable-no-wasteful-work", "F-be-sustainable-third-party-and-media-budget" ] }, { "type": "trace-summary", "path": "evidence/home-trace-summary.json", "caption": "home trace summary.json", "findingIds": [ "F-be-fast-and-stable-good-core-web-vitals" ] }, { "type": "trace", "path": "evidence/home-trace.json", "caption": "home trace.json", "findingIds": [ "F-be-fast-and-stable-good-core-web-vitals" ] }, { "type": "har", "path": "evidence/home.har", "caption": "home.har", "findingIds": [ "F-be-fast-and-stable-efficient-resource-delivery" ] }, { "type": "other", "path": "evidence/images.json", "caption": "images.json", "findingIds": [ "F-be-inclusive-names-roles-labels", "F-follow-best-practices-sound-document-and-assets", "F-be-sustainable-optimised-assets" ] }, { "type": "lighthouse", "path": "evidence/lighthouse-home.json", "caption": "lighthouse home.json", "findingIds": [ "F-respect-user-preferences-respects-contrast", "F-adapt-to-the-form-factor-input-modality-aware", "F-be-fast-and-stable-good-core-web-vitals", "F-be-fast-and-stable-trim-unused-and-duplicate-code", "F-be-inclusive-names-roles-labels", "F-be-inclusive-sufficient-contrast", "F-be-inclusive-zoom-reflow-targets-and-media", "F-follow-best-practices-no-console-errors", "F-follow-best-practices-browser-platform-hygiene", "F-be-discoverable-crawlable-and-mobile-friendly", "F-be-sustainable-no-wasteful-work" ] }, { "type": "screenshot", "path": "evidence/listing-desktop.png", "caption": "listing desktop.png", "findingIds": [ "F-adapt-to-the-form-factor-component-level-responsiveness" ] }, { "type": "dom", "path": "evidence/listing-dom.json", "caption": "listing dom.json", "findingIds": [] }, { "type": "layout", "path": "evidence/listing-mobile-layout.json", "caption": "listing mobile layout.json", "findingIds": [] }, { "type": "other", "path": "evidence/login-probe.json", "caption": "login probe.json", "findingIds": [] }, { "type": "screenshot", "path": "evidence/login.png", "caption": "login.png", "findingIds": [] }, { "type": "dom", "path": "evidence/not-found-dom.json", "caption": "not found dom.json", "findingIds": [] }, { "type": "screenshot", "path": "evidence/not-found.png", "caption": "not found.png", "findingIds": [] }, { "type": "other", "path": "evidence/preferences-probe.json", "caption": "preferences probe.json", "findingIds": [ "F-respect-user-preferences-respects-color-scheme", "F-respect-user-preferences-respects-contrast" ] }, { "type": "other", "path": "evidence/robots.json", "caption": "robots.json", "findingIds": [] }, { "type": "other", "path": "evidence/runtime-advanced-probe.json", "caption": "runtime advanced probe.json", "findingIds": [] }, { "type": "screenshot", "path": "evidence/search-desktop.png", "caption": "search desktop.png", "findingIds": [] }, { "type": "dom", "path": "evidence/search-dom.json", "caption": "search dom.json", "findingIds": [] }, { "type": "other", "path": "evidence/secrets.json", "caption": "secrets.json", "findingIds": [] }, { "type": "other", "path": "evidence/sitemap.json", "caption": "sitemap.json", "findingIds": [] }, { "type": "other", "path": "evidence/trackers.json", "caption": "trackers.json", "findingIds": [ "F-be-private-and-secure-data-minimisation-and-third-parties", "F-be-sustainable-no-wasteful-work", "F-be-sustainable-third-party-and-media-budget" ] } ], "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": "Active browser evidence and artifact review against the mapped guidance.", "evidence": "The dark-emulated screenshot is visually identical to the light page; the probe reports colorScheme \"normal\", body text rgb(51,51,51), and no color-scheme media rules.", "pathIds": [ "home" ], "artifacts": [ "evidence/home-dark.png", "evidence/preferences-probe.json" ], "findingIds": [ "F-respect-user-preferences-respects-color-scheme" ] }, { "principleId": "respect-user-preferences", "checkId": "respects-reduced-motion", "status": "pass", "confidence": "high", "method": "Direct rendered, DOM, layout, network, metadata, or heap evidence targeted to this check.", "evidence": "Preference probe under reduce reported zero active animations; screenshots showed no auto-advance.", "pathIds": [ "home" ], "artifacts": [ "evidence/preferences-probe.json" ] }, { "principleId": "respect-user-preferences", "checkId": "respects-contrast", "status": "issues", "confidence": "high", "method": "Active browser evidence and artifact review against the mapped guidance.", "evidence": "The preference CSS probe found no prefers-contrast or forced-colors rules, and Lighthouse failed its color-contrast audit.", "pathIds": [ "home" ], "artifacts": [ "evidence/preferences-probe.json", "evidence/lighthouse-home.json" ], "findingIds": [ "F-respect-user-preferences-respects-contrast" ] }, { "principleId": "implement-natural-interactions", "checkId": "view-transitions", "status": "issues", "confidence": "high", "method": "Active browser evidence and artifact review against the mapped guidance.", "evidence": "The platform probe found no authored view-transition rules while the representative navigation is an MPA with page-to-page route changes.", "pathIds": [ "home" ], "artifacts": [ "evidence/a11y-interaction-probe.json", "evidence/home-desktop.png" ], "findingIds": [ "F-implement-natural-interactions-view-transitions" ] }, { "principleId": "implement-natural-interactions", "checkId": "scroll-driven-animations", "status": "pass", "confidence": "high", "method": "Direct rendered, DOM, layout, network, metadata, or heap evidence targeted to this check.", "evidence": "CSS/runtime probe found no authored animation-timeline and observed no scroll-linked motion, so no main-thread scroll animation anti-pattern was present.", "pathIds": [ "home" ], "artifacts": [ "evidence/a11y-interaction-probe.json" ] }, { "principleId": "implement-natural-interactions", "checkId": "physical-gestures", "status": "pass", "confidence": "high", "method": "Direct rendered, DOM, layout, network, metadata, or heap evidence targeted to this check.", "evidence": "Mobile evidence showed native document scrolling and standard controls without custom pointer-driven gestures fighting the platform.", "pathIds": [ "home" ], "artifacts": [ "evidence/home-mobile.png" ] }, { "principleId": "provide-guided-navigation", "checkId": "scroll-state-aware-chrome", "status": "pass", "confidence": "high", "method": "Direct rendered, DOM, layout, network, metadata, or heap evidence targeted to this check.", "evidence": "Desktop and mobile captures show a stable, consistent global navigation hierarchy and section state rather than disorienting chrome changes.", "pathIds": [ "home" ], "artifacts": [ "evidence/home-desktop.png", "evidence/home-mobile.png", "evidence/listing-desktop.png" ] }, { "principleId": "provide-guided-navigation", "checkId": "anchored-positioning", "status": "not-applicable", "confidence": "high", "method": "Applicability judgement from representative-route recon and site policy.", "evidence": "No tooltip, popover, or edge-positioned menu requiring anchored positioning was present in the exercised reader paths.", "reason": "No tooltip, popover, or edge-positioned menu requiring anchored positioning was present in the exercised reader paths.", "pathIds": [ "home" ] }, { "principleId": "provide-guided-navigation", "checkId": "directs-attention", "status": "pass", "confidence": "high", "method": "Direct rendered, DOM, layout, network, metadata, or heap evidence targeted to this check.", "evidence": "Skip link, strong active navigation styling, descriptive headlines and clear section tabs direct attention across home/listing/search.", "pathIds": [ "home" ], "artifacts": [ "evidence/a11y-interaction-probe.json", "evidence/listing-desktop.png", "evidence/search-desktop.png" ] }, { "principleId": "maximize-content-reduce-noise", "checkId": "no-intrusive-interruptions", "status": "issues", "confidence": "high", "method": "Active browser evidence and artifact review against the mapped guidance.", "evidence": "Desktop and mobile screenshots show a large consent panel over the lead story; on mobile it covers roughly the lower third of the first viewport.", "pathIds": [ "home" ], "artifacts": [ "evidence/home-desktop.png", "evidence/home-mobile.png" ], "findingIds": [ "F-maximize-content-reduce-noise-no-intrusive-interruptions" ] }, { "principleId": "maximize-content-reduce-noise", "checkId": "semantic-dismissible-primitives", "status": "issues", "confidence": "high", "method": "Active browser evidence and artifact review against the mapped guidance.", "evidence": "The DOM probe found no dialog, role=dialog, or popover while the screenshot shows modal-like overlay content delivered through a third-party iframe.", "pathIds": [ "home" ], "artifacts": [ "evidence/a11y-interaction-probe.json", "evidence/home-desktop.png" ], "findingIds": [ "F-maximize-content-reduce-noise-semantic-dismissible-primitives" ] }, { "principleId": "maximize-content-reduce-noise", "checkId": "reduced-chrome", "status": "pass", "confidence": "high", "method": "Direct rendered, DOM, layout, network, metadata, or heap evidence targeted to this check.", "evidence": "Aside from the separately reported consent overlay, article/listing templates use restrained borders and prioritize headline/content space.", "pathIds": [ "article" ], "artifacts": [ "evidence/article-desktop.png", "evidence/listing-desktop.png" ] }, { "principleId": "adapt-to-the-form-factor", "checkId": "responsive-no-horizontal-scroll", "status": "pass", "confidence": "high", "method": "Direct rendered, DOM, layout, network, metadata, or heap evidence targeted to this check.", "evidence": "At 360px, layout reported scrollWidth=clientWidth=360 and 0px horizontal overflow; the mobile screenshot shows a reflowed single-column layout.", "pathIds": [ "home" ], "artifacts": [ "evidence/home-mobile-layout.json", "evidence/home-mobile.png" ] }, { "principleId": "adapt-to-the-form-factor", "checkId": "component-level-responsiveness", "status": "issues", "confidence": "high", "method": "Active browser evidence and artifact review against the mapped guidance.", "evidence": "The CSS capability probe found no authored @container rules despite cards and navigation components appearing in multiple widths.", "pathIds": [ "home" ], "artifacts": [ "evidence/a11y-interaction-probe.json", "evidence/home-mobile.png", "evidence/listing-desktop.png" ], "findingIds": [ "F-adapt-to-the-form-factor-component-level-responsiveness" ] }, { "principleId": "adapt-to-the-form-factor", "checkId": "input-modality-aware", "status": "issues", "confidence": "high", "method": "Active browser evidence and artifact review against the mapped guidance.", "evidence": "Lighthouse failed target-size, and the interaction probe found numerous visible links only 13–23px high.", "pathIds": [ "home" ], "artifacts": [ "evidence/lighthouse-home.json", "evidence/a11y-interaction-probe.json" ], "findingIds": [ "F-adapt-to-the-form-factor-input-modality-aware" ] }, { "principleId": "support-core-task-success", "checkId": "clear-purpose-and-primary-action", "status": "pass", "confidence": "high", "method": "Direct rendered, DOM, layout, network, metadata, or heap evidence targeted to this check.", "evidence": "The homepage immediately identifies Nikkei and presents lead news; listing/search/article pages use explicit headings and recognizable next actions.", "pathIds": [ "home" ], "artifacts": [ "evidence/home-desktop.png", "evidence/listing-desktop.png", "evidence/search-desktop.png", "evidence/article-desktop.png" ] }, { "principleId": "support-core-task-success", "checkId": "primary-flow-completion", "status": "pass", "confidence": "high", "method": "Direct rendered, DOM, layout, network, metadata, or heap evidence targeted to this check.", "evidence": "Home-to-listing/article links are real URLs, search returned a query state, and the subscriber article clearly identifies its access requirement.", "pathIds": [ "home" ], "artifacts": [ "evidence/home-recon.json", "evidence/search-desktop.png", "evidence/article-desktop.png" ] }, { "principleId": "support-core-task-success", "checkId": "clear-system-state-and-recovery", "status": "pass", "confidence": "high", "method": "Direct rendered, DOM, layout, network, metadata, or heap evidence targeted to this check.", "evidence": "The paywall clearly states member-only status, and the exercised unknown route presents a specific not-found explanation rather than a blank shell.", "pathIds": [ "article" ], "artifacts": [ "evidence/article-desktop.png", "evidence/not-found.png" ] }, { "principleId": "be-fast-and-stable", "checkId": "good-core-web-vitals", "status": "issues", "confidence": "high", "method": "Active browser evidence and artifact review against the mapped guidance.", "evidence": "Lighthouse measured LCP 4.0s and Speed Index 6.9s; the independent trace measured LCP 2.15s, showing variable but material load risk.", "pathIds": [ "home" ], "artifacts": [ "evidence/lighthouse-home.json", "evidence/home-trace-summary.json", "evidence/home-trace.json" ], "findingIds": [ "F-be-fast-and-stable-good-core-web-vitals" ] }, { "principleId": "be-fast-and-stable", "checkId": "visual-stability", "status": "pass", "confidence": "high", "method": "Direct rendered, DOM, layout, network, metadata, or heap evidence targeted to this check.", "evidence": "Mobile layout observer recorded CLS 0 and no shifts; Lighthouse CLS was 0.014, within the good range.", "pathIds": [ "home" ], "artifacts": [ "evidence/home-mobile-layout.json", "evidence/lighthouse-home.json" ] }, { "principleId": "be-fast-and-stable", "checkId": "efficient-main-thread", "status": "pass", "confidence": "high", "method": "Direct rendered, DOM, layout, network, metadata, or heap evidence targeted to this check.", "evidence": "Trace recorded one 116ms long task and 66ms TBT; Lighthouse TBT was 35ms, both showing a generally responsive main thread.", "pathIds": [ "home" ], "artifacts": [ "evidence/home-trace-summary.json", "evidence/lighthouse-home.json" ] }, { "principleId": "be-fast-and-stable", "checkId": "efficient-resource-delivery", "status": "issues", "confidence": "high", "method": "Active browser evidence and artifact review against the mapped guidance.", "evidence": "HAR recorded 113 requests and 1.65MB transferred; it identified an uncached 66.9KB campaign image and multiple high-priority tracking scripts.", "pathIds": [ "home" ], "artifacts": [ "evidence/home-summary.json", "evidence/home.har" ], "findingIds": [ "F-be-fast-and-stable-efficient-resource-delivery" ] }, { "principleId": "be-fast-and-stable", "checkId": "trim-unused-and-duplicate-code", "status": "issues", "confidence": "high", "method": "Active browser evidence and artifact review against the mapped guidance.", "evidence": "HAR attributes 59 requests and 1.34MB, about 81% of transfer, to non-main origins; Lighthouse also reports missing source maps for large first-party JavaScript.", "pathIds": [ "home" ], "artifacts": [ "evidence/home-summary.json", "evidence/lighthouse-home.json" ], "findingIds": [ "F-be-fast-and-stable-trim-unused-and-duplicate-code" ] }, { "principleId": "be-inclusive", "checkId": "names-roles-labels", "status": "issues", "confidence": "high", "method": "Active browser evidence and artifact review against the mapped guidance.", "evidence": "Lighthouse failed link-name and the DOM probe found multiple visible image-only article links without direct text/ARIA naming; the images audit reported 31 missing alt values, including decorative and potentially meaningful images.", "pathIds": [ "home" ], "artifacts": [ "evidence/lighthouse-home.json", "evidence/a11y-interaction-probe.json", "evidence/images.json" ], "findingIds": [ "F-be-inclusive-names-roles-labels" ] }, { "principleId": "be-inclusive", "checkId": "sufficient-contrast", "status": "issues", "confidence": "high", "method": "Active browser evidence and artifact review against the mapped guidance.", "evidence": "Lighthouse’s color-contrast audit failed on the homepage.", "pathIds": [ "home" ], "artifacts": [ "evidence/lighthouse-home.json" ], "findingIds": [ "F-be-inclusive-sufficient-contrast" ] }, { "principleId": "be-inclusive", "checkId": "structure-and-focus", "status": "pass", "confidence": "high", "method": "Direct rendered, DOM, layout, network, metadata, or heap evidence targeted to this check.", "evidence": "The page has a skip link, headings/landmarks, and the focused skip link showed a 3px solid visible outline.", "pathIds": [ "home" ], "artifacts": [ "evidence/a11y-interaction-probe.json", "evidence/home-recon.json" ] }, { "principleId": "be-inclusive", "checkId": "legible-text", "status": "pass", "confidence": "high", "method": "Direct rendered, DOM, layout, network, metadata, or heap evidence targeted to this check.", "evidence": "Desktop/mobile screenshots show readable Japanese typography, adequate line spacing, and no clipping at the tested sizes.", "pathIds": [ "home" ], "artifacts": [ "evidence/home-desktop.png", "evidence/home-mobile.png", "evidence/article-desktop.png" ] }, { "principleId": "be-inclusive", "checkId": "zoom-reflow-targets-and-media", "status": "issues", "confidence": "high", "method": "Active browser evidence and artifact review against the mapped guidance.", "evidence": "The 360px layout has no horizontal overflow, but Lighthouse failed target-size and the probe recorded many controls below 24px high.", "pathIds": [ "home" ], "artifacts": [ "evidence/home-mobile-layout.json", "evidence/lighthouse-home.json", "evidence/home-mobile.png" ], "findingIds": [ "F-be-inclusive-zoom-reflow-targets-and-media" ] }, { "principleId": "follow-best-practices", "checkId": "no-console-errors", "status": "issues", "confidence": "high", "method": "Active browser evidence and artifact review against the mapped guidance.", "evidence": "Lighthouse failed errors-in-console; HAR also recorded failed Facebook, ad, tag-manager and ORB-blocked tracking requests.", "pathIds": [ "home" ], "artifacts": [ "evidence/lighthouse-home.json", "evidence/home-summary.json" ], "findingIds": [ "F-follow-best-practices-no-console-errors" ] }, { "principleId": "follow-best-practices", "checkId": "sound-document-and-assets", "status": "issues", "confidence": "high", "method": "Active browser evidence and artifact review against the mapped guidance.", "evidence": "The image probe reports 95 of 100 images without width/height attributes, 35 oversized images, 82 below-fold images not lazy-loaded, and 43 legacy-format assets.", "pathIds": [ "home" ], "artifacts": [ "evidence/images.json" ], "findingIds": [ "F-follow-best-practices-sound-document-and-assets" ] }, { "principleId": "follow-best-practices", "checkId": "browser-platform-hygiene", "status": "issues", "confidence": "high", "method": "Active browser evidence and artifact review against the mapped guidance.", "evidence": "Lighthouse failed inspector-issues and valid-source-maps for large first-party JavaScript.", "pathIds": [ "home" ], "artifacts": [ "evidence/lighthouse-home.json" ], "findingIds": [ "F-follow-best-practices-browser-platform-hygiene" ] }, { "principleId": "be-discoverable", "checkId": "title-and-description", "status": "pass", "confidence": "high", "method": "Direct rendered, DOM, layout, network, metadata, or heap evidence targeted to this check.", "evidence": "DOM and discoverability evidence confirm a descriptive title and meta description on the public homepage; article rendered title is specific.", "pathIds": [ "home" ], "artifacts": [ "evidence/home-recon.json", "evidence/home-discoverability.json", "evidence/article-discoverability.json" ] }, { "principleId": "be-discoverable", "checkId": "crawlable-and-mobile-friendly", "status": "issues", "confidence": "high", "method": "Active browser evidence and artifact review against the mapped guidance.", "evidence": "Lighthouse failed crawlable-anchors even though the viewport meta and most sampled navigation links use real href values.", "pathIds": [ "home" ], "artifacts": [ "evidence/lighthouse-home.json", "evidence/home-recon.json" ], "findingIds": [ "F-be-discoverable-crawlable-and-mobile-friendly" ] }, { "principleId": "be-discoverable", "checkId": "canonical-and-indexing-signals", "status": "pass", "confidence": "high", "method": "Direct rendered, DOM, layout, network, metadata, or heap evidence targeted to this check.", "evidence": "Homepage returned 200, exposes canonical https://www.nikkei.com/, robots links a sitemap, and no accidental global noindex was observed.", "pathIds": [ "home" ], "artifacts": [ "evidence/home-recon.json", "evidence/robots.json", "evidence/sitemap.json" ] }, { "principleId": "be-discoverable", "checkId": "structured-and-shareable-metadata", "status": "pass", "confidence": "high", "method": "Direct rendered, DOM, layout, network, metadata, or heap evidence targeted to this check.", "evidence": "Homepage includes WebSite JSON-LD plus Open Graph/Twitter title, description, image and URL metadata matching visible content.", "pathIds": [ "home" ], "artifacts": [ "evidence/home-recon.json", "evidence/runtime-advanced-probe.json" ] }, { "principleId": "be-private-and-secure", "checkId": "secure-transport-and-headers", "status": "issues", "confidence": "high", "method": "Active browser evidence and artifact review against the mapped guidance.", "evidence": "The cookie probe found lux_uid without Secure and a 400-day analytics cookie; the response CSP only sets frame-ancestors while a meta CSP allows unsafe-inline and unsafe-eval across a very broad origin list.", "pathIds": [ "home" ], "artifacts": [ "evidence/headers.json", "evidence/cookies.json", "evidence/home-recon.json" ], "findingIds": [ "F-be-private-and-secure-secure-transport-and-headers" ] }, { "principleId": "be-private-and-secure", "checkId": "data-minimisation-and-third-parties", "status": "issues", "confidence": "high", "method": "Active browser evidence and artifact review against the mapped guidance.", "evidence": "Tracker evidence found 12 third-party origins including Facebook and Google Tag Manager; HAR attributes 59 requests and 1.34MB to non-main origins before consent interaction.", "pathIds": [ "home" ], "artifacts": [ "evidence/trackers.json", "evidence/home-summary.json", "evidence/home-desktop.png" ], "findingIds": [ "F-be-private-and-secure-data-minimisation-and-third-parties" ] }, { "principleId": "be-private-and-secure", "checkId": "in-context-permissions-and-modern-auth", "status": "pass", "confidence": "high", "method": "Direct rendered, DOM, layout, network, metadata, or heap evidence targeted to this check.", "evidence": "No permission prompt appeared on load; login redirects to NIKKEI ID and exposes autocomplete=\"username webauthn\" plus passkey/WebAuthn support.", "pathIds": [ "login" ], "artifacts": [ "evidence/login-probe.json", "evidence/login.png" ] }, { "principleId": "be-private-and-secure", "checkId": "defensive-browser-policies", "status": "pass", "confidence": "high", "method": "Direct rendered, DOM, layout, network, metadata, or heap evidence targeted to this check.", "evidence": "Headers include HSTS, nosniff, frame-ancestors, strict-origin-when-cross-origin and Permissions-Policy; clickjacking protection is present through CSP.", "pathIds": [ "home" ], "artifacts": [ "evidence/headers.json" ] }, { "principleId": "be-resilient", "checkId": "progressive-enhancement", "status": "issues", "confidence": "high", "method": "Active browser evidence and artifact review against the mapped guidance.", "evidence": "Discoverability measured only 32% overlap for the representative article; its rendered title and h1 were absent from raw HTML. Homepage overlap was 43%.", "pathIds": [ "home" ], "artifacts": [ "evidence/article-discoverability.json", "evidence/article-discoverability-crawler.png", "evidence/article-discoverability-rendered.png" ], "findingIds": [ "F-be-resilient-progressive-enhancement" ] }, { "principleId": "be-resilient", "checkId": "resilient-runtime-behaviour", "status": "pass", "confidence": "high", "method": "Direct rendered, DOM, layout, network, metadata, or heap evidence targeted to this check.", "evidence": "Representative home/listing/article/search pages rendered stable controls; no clipped menu was observed, and the consent panel remains within the viewport.", "pathIds": [ "home" ], "artifacts": [ "evidence/home-desktop.png", "evidence/home-mobile.png", "evidence/listing-desktop.png", "evidence/article-desktop.png" ] }, { "principleId": "be-resilient", "checkId": "offline-and-installable", "status": "not-applicable", "confidence": "high", "method": "Applicability judgement from representative-route recon and site policy.", "evidence": "Nikkei is a live news/market service rather than an install-focused app; offline installability was judged out of scope, while progressive enhancement and failure handling were still tested.", "reason": "Nikkei is a live news/market service rather than an install-focused app; offline installability was judged out of scope, while progressive enhancement and failure handling were still tested.", "pathIds": [ "home" ] }, { "principleId": "be-resilient", "checkId": "network-and-http-failure-states", "status": "pass", "confidence": "high", "method": "Direct rendered, DOM, layout, network, metadata, or heap evidence targeted to this check.", "evidence": "An unknown route renders a clear Japanese not-found explanation and preserves global navigation for recovery.", "pathIds": [ "not-found" ], "artifacts": [ "evidence/not-found.png" ] }, { "principleId": "be-internationalised", "checkId": "lang-dir-and-logical-properties", "status": "pass", "confidence": "high", "method": "Direct rendered, DOM, layout, network, metadata, or heap evidence targeted to this check.", "evidence": "html lang is ja; Japanese uses default LTR direction, and CSS probe found substantial logical-property use alongside physical declarations.", "pathIds": [ "home" ], "artifacts": [ "evidence/runtime-advanced-probe.json", "evidence/home-recon.json" ] }, { "principleId": "be-internationalised", "checkId": "locale-aware-data", "status": "pass", "confidence": "high", "method": "Direct rendered, DOM, layout, network, metadata, or heap evidence targeted to this check.", "evidence": "Rendered market values and Japanese date/time labels are locale-appropriate; machine-readable time elements accompany visible labels.", "pathIds": [ "home" ], "artifacts": [ "evidence/home-desktop.png", "evidence/runtime-advanced-probe.json" ] }, { "principleId": "be-internationalised", "checkId": "time-zone-correctness", "status": "pass", "confidence": "high", "method": "Direct rendered, DOM, layout, network, metadata, or heap evidence targeted to this check.", "evidence": "Sampled time elements use UTC Z or explicit +09:00 offsets, avoiding ambiguous stored timestamps.", "pathIds": [ "home" ], "artifacts": [ "evidence/runtime-advanced-probe.json" ] }, { "principleId": "be-trustworthy", "checkId": "no-dark-patterns", "status": "pass", "confidence": "high", "method": "Direct rendered, DOM, layout, network, metadata, or heap evidence targeted to this check.", "evidence": "Consent presents equally prominent Reject and Agree actions with a details link; subscriber-only content is marked with lock icons before navigation.", "pathIds": [ "home" ], "artifacts": [ "evidence/home-desktop.png", "evidence/article-desktop.png" ] }, { "principleId": "be-trustworthy", "checkId": "humane-error-handling", "status": "pass", "confidence": "high", "method": "Direct rendered, DOM, layout, network, metadata, or heap evidence targeted to this check.", "evidence": "Login uses native email/password input types and the exercised 404 state explains the problem without blaming the user.", "pathIds": [ "login" ], "artifacts": [ "evidence/login-probe.json", "evidence/not-found.png" ] }, { "principleId": "be-trustworthy", "checkId": "trustworthy-input-assistance", "status": "pass", "confidence": "high", "method": "Direct rendered, DOM, layout, network, metadata, or heap evidence targeted to this check.", "evidence": "Login fields provide username webauthn and current-password autocomplete tokens; search is correctly typed as search.", "pathIds": [ "login" ], "artifacts": [ "evidence/login-probe.json", "evidence/home-recon.json" ] }, { "principleId": "be-trustworthy", "checkId": "safe-commercial-and-account-flows", "status": "pass", "confidence": "high", "method": "Direct rendered, DOM, layout, network, metadata, or heap evidence targeted to this check.", "evidence": "Login clearly redirects to NIKKEI ID, supports WebAuthn/passkeys, and subscriber-only article access is stated before content continuation.", "pathIds": [ "login" ], "artifacts": [ "evidence/login-probe.json", "evidence/article-desktop.png" ] }, { "principleId": "be-sustainable", "checkId": "optimised-assets", "status": "issues", "confidence": "high", "method": "Active browser evidence and artifact review against the mapped guidance.", "evidence": "The image audit found 35 oversized images, 43 legacy-format images and 6 without responsive sources.", "pathIds": [ "home" ], "artifacts": [ "evidence/images.json", "evidence/home-summary.json" ], "findingIds": [ "F-be-sustainable-optimised-assets" ] }, { "principleId": "be-sustainable", "checkId": "no-wasteful-work", "status": "issues", "confidence": "high", "method": "Active browser evidence and artifact review against the mapped guidance.", "evidence": "The HAR recorded 59 third-party requests while Lighthouse reported forced reflow and the page loaded multiple analytics/tracking integrations.", "pathIds": [ "home" ], "artifacts": [ "evidence/home-summary.json", "evidence/lighthouse-home.json", "evidence/trackers.json" ], "findingIds": [ "F-be-sustainable-no-wasteful-work" ] }, { "principleId": "be-sustainable", "checkId": "third-party-and-media-budget", "status": "issues", "confidence": "high", "method": "Active browser evidence and artifact review against the mapped guidance.", "evidence": "Third-party origins account for 1.34MB of 1.65MB total transferred; the CMP alone transferred about 500KB across its origins.", "pathIds": [ "home" ], "artifacts": [ "evidence/home-summary.json", "evidence/trackers.json" ], "findingIds": [ "F-be-sustainable-third-party-and-media-budget" ] }, { "principleId": "be-agent-ready", "checkId": "structured-agent-capabilities", "status": "not-applicable", "confidence": "high", "method": "Applicability judgement from representative-route recon and site policy.", "evidence": "robots.txt explicitly blocks major AI agents and directs machine-learning users to licensing, demonstrating a deliberate choice not to expose an agent-facing surface.", "reason": "robots.txt explicitly blocks major AI agents and directs machine-learning users to licensing, demonstrating a deliberate choice not to expose an agent-facing surface.", "pathIds": [ "home" ] }, { "principleId": "be-agent-ready", "checkId": "on-device-inference", "status": "not-applicable", "confidence": "high", "method": "Applicability judgement from representative-route recon and site policy.", "evidence": "The publisher explicitly blocks AI-agent use and no user-facing inference task is promised; on-device inference is therefore not applicable to the audited journeys.", "reason": "The publisher explicitly blocks AI-agent use and no user-facing inference task is promised; on-device inference is therefore not applicable to the audited journeys.", "pathIds": [ "home" ] }, { "principleId": "be-memory-efficient", "checkId": "no-leak-under-repeated-interaction", "status": "issues", "confidence": "medium", "method": "Active browser evidence and artifact review against the mapped guidance.", "evidence": "After 10 open/close cycles, the heap summary rose from 22.64MB/310,078 nodes to 24.30MB/330,095 nodes (about 7% bytes and 6.5% nodes). Separate browser sessions lower confidence, but constructor counts also rose.", "pathIds": [ "home" ], "artifacts": [ "evidence/heap-baseline.json", "evidence/heap-post.json" ], "findingIds": [ "F-be-memory-efficient-no-leak-under-repeated-interaction" ] }, { "principleId": "be-memory-efficient", "checkId": "bounded-footprint", "status": "issues", "confidence": "medium", "method": "Active browser evidence and artifact review against the mapped guidance.", "evidence": "Baseline heap summary contains 310,078 nodes and 22.64MB self size before deliberate interaction.", "pathIds": [ "home" ], "artifacts": [ "evidence/heap-baseline.json" ], "findingIds": [ "F-be-memory-efficient-bounded-footprint" ] }, { "principleId": "be-memory-efficient", "checkId": "no-detached-dom-or-unbounded-listeners", "status": "pass", "confidence": "high", "method": "Direct rendered, DOM, layout, network, metadata, or heap evidence targeted to this check.", "evidence": "Neither heap summary listed Detached* constructors among the largest populations; no direct detached-DOM accumulation signal appeared.", "pathIds": [ "home" ], "artifacts": [ "evidence/heap-baseline.json", "evidence/heap-post.json" ] } ], "principleOutcomes": [ { "principleId": "respect-user-preferences", "expectation": "default", "status": "issues", "findingIds": [ "F-respect-user-preferences-respects-color-scheme", "F-respect-user-preferences-respects-contrast" ] }, { "principleId": "implement-natural-interactions", "expectation": "default", "status": "issues", "findingIds": [ "F-implement-natural-interactions-view-transitions" ] }, { "principleId": "provide-guided-navigation", "expectation": "default", "status": "pass" }, { "principleId": "maximize-content-reduce-noise", "expectation": "default", "status": "issues", "findingIds": [ "F-maximize-content-reduce-noise-no-intrusive-interruptions", "F-maximize-content-reduce-noise-semantic-dismissible-primitives" ] }, { "principleId": "adapt-to-the-form-factor", "expectation": "default", "status": "issues", "findingIds": [ "F-adapt-to-the-form-factor-component-level-responsiveness", "F-adapt-to-the-form-factor-input-modality-aware" ] }, { "principleId": "support-core-task-success", "expectation": "default", "status": "pass" }, { "principleId": "be-fast-and-stable", "expectation": "default", "status": "issues", "findingIds": [ "F-be-fast-and-stable-good-core-web-vitals", "F-be-fast-and-stable-efficient-resource-delivery", "F-be-fast-and-stable-trim-unused-and-duplicate-code" ] }, { "principleId": "be-inclusive", "expectation": "default", "status": "issues", "findingIds": [ "F-be-inclusive-names-roles-labels", "F-be-inclusive-sufficient-contrast", "F-be-inclusive-zoom-reflow-targets-and-media" ] }, { "principleId": "follow-best-practices", "expectation": "default", "status": "issues", "findingIds": [ "F-follow-best-practices-no-console-errors", "F-follow-best-practices-sound-document-and-assets", "F-follow-best-practices-browser-platform-hygiene" ] }, { "principleId": "be-discoverable", "expectation": "default", "status": "issues", "findingIds": [ "F-be-discoverable-crawlable-and-mobile-friendly" ] }, { "principleId": "be-private-and-secure", "expectation": "default", "status": "issues", "findingIds": [ "F-be-private-and-secure-secure-transport-and-headers", "F-be-private-and-secure-data-minimisation-and-third-parties" ] }, { "principleId": "be-resilient", "expectation": "contextual", "status": "issues", "findingIds": [ "F-be-resilient-progressive-enhancement" ] }, { "principleId": "be-internationalised", "expectation": "contextual", "status": "pass" }, { "principleId": "be-trustworthy", "expectation": "default", "status": "pass" }, { "principleId": "be-sustainable", "expectation": "contextual", "status": "issues", "findingIds": [ "F-be-sustainable-optimised-assets", "F-be-sustainable-no-wasteful-work", "F-be-sustainable-third-party-and-media-budget" ] }, { "principleId": "be-agent-ready", "expectation": "contextual", "status": "not-applicable", "reason": "robots.txt explicitly blocks major AI agents and directs machine-learning users to licensing, demonstrating a deliberate choice not to expose an agent-facing surface. The publisher explicitly blocks AI-agent use and no user-facing inference task is promised; on-device inference is therefore not applicable to the audited journeys." }, { "principleId": "be-memory-efficient", "expectation": "default", "status": "issues", "findingIds": [ "F-be-memory-efficient-no-leak-under-repeated-interaction", "F-be-memory-efficient-bounded-footprint" ] } ], "paths": [ { "id": "home", "description": "Homepage: primary news discovery surface and shared global navigation/chrome.", "url": "https://www.nikkei.com/", "conditions": [ "desktop", "viewport: 360x800", "prefers-color-scheme: dark", "prefers-reduced-motion: reduce" ], "result": "issues" }, { "id": "listing", "description": "Business news listing: representative section/index template.", "url": "https://www.nikkei.com/news/category/business/", "conditions": [ "desktop", "viewport: 360x800" ], "result": "issues" }, { "id": "article", "description": "Lead subscriber article: representative article/detail and paywall template.", "url": "https://www.nikkei.com/article/DGXZQOCD1620V0W6A710C2000000/", "conditions": [ "desktop", "JavaScript enabled and crawler/no-JS comparison" ], "result": "issues" }, { "id": "search", "description": "Search for AI: representative query and results journey.", "url": "https://www.nikkei.com/search?keyword=AI", "conditions": [ "desktop" ], "result": "pass" }, { "id": "login", "description": "Login redirect to NIKKEI ID: representative authentication form and passkey/autocomplete inspection.", "url": "https://www.nikkei.com/login", "conditions": [ "desktop" ], "result": "pass" }, { "id": "not-found", "description": "Unknown route: representative HTTP/navigation failure recovery state.", "url": "https://www.nikkei.com/this-route-does-not-exist-web-uplift", "conditions": [ "desktop" ], "result": "pass" } ], "findings": [ { "id": "F-maximize-content-reduce-noise-no-intrusive-interruptions", "pathId": "home", "url": "https://www.nikkei.com/", "principleId": "maximize-content-reduce-noise", "principleCheckId": "no-intrusive-interruptions", "guidanceId": "light-dismiss-a-dialog", "guidanceCategory": "web-platform", "severity": "high", "confidence": "high", "summary": "A consent prompt obscures primary news content on initial load.", "evidence": "Desktop and mobile screenshots show a large consent panel over the lead story; on mobile it covers roughly the lower third of the first viewport.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-mobile.png" ], "suggestedFix": "Use a compact, non-obscuring consent surface where lawful, preserve equal Reject/Agree actions, and keep content readable.", "effort": "medium" }, { "id": "F-adapt-to-the-form-factor-input-modality-aware", "pathId": "home", "url": "https://www.nikkei.com/", "principleId": "adapt-to-the-form-factor", "principleCheckId": "input-modality-aware", "guidanceId": "accessibility", "guidanceCategory": "accessibility", "severity": "high", "confidence": "high", "summary": "Many interactive targets are too small for touch.", "evidence": "Lighthouse failed target-size, and the interaction probe found numerous visible links only 13–23px high.", "artifacts": [ "evidence/lighthouse-home.json", "evidence/a11y-interaction-probe.json" ], "suggestedFix": "Provide at least 24×24 CSS px targets with adequate spacing, preferably 44px for primary mobile controls.", "effort": "medium" }, { "id": "F-be-fast-and-stable-good-core-web-vitals", "pathId": "home", "url": "https://www.nikkei.com/", "principleId": "be-fast-and-stable", "principleCheckId": "good-core-web-vitals", "guidanceId": "performance", "guidanceCategory": "performance", "severity": "high", "confidence": "high", "summary": "Lab LCP misses the good Core Web Vitals threshold.", "evidence": "Lighthouse measured LCP 4.0s and Speed Index 6.9s; the independent trace measured LCP 2.15s, showing variable but material load risk.", "artifacts": [ "evidence/lighthouse-home.json", "evidence/home-trace-summary.json", "evidence/home-trace.json" ], "suggestedFix": "Prioritize the lead image/content, reduce third-party competition, and validate LCP under mobile throttling.", "effort": "medium" }, { "id": "F-be-inclusive-names-roles-labels", "pathId": "home", "url": "https://www.nikkei.com/", "principleId": "be-inclusive", "principleCheckId": "names-roles-labels", "guidanceId": "accessibility", "guidanceCategory": "accessibility", "severity": "high", "confidence": "high", "summary": "Some links lack discernible accessible names.", "evidence": "Lighthouse failed link-name and the DOM probe found multiple visible image-only article links without direct text/ARIA naming; the images audit reported 31 missing alt values, including decorative and potentially meaningful images.", "artifacts": [ "evidence/lighthouse-home.json", "evidence/a11y-interaction-probe.json", "evidence/images.json" ], "suggestedFix": "Give every interactive link a computed accessible name and provide meaningful alt text while using empty alt for decorative images.", "effort": "medium" }, { "id": "F-be-inclusive-sufficient-contrast", "pathId": "home", "url": "https://www.nikkei.com/", "principleId": "be-inclusive", "principleCheckId": "sufficient-contrast", "guidanceId": "accessibility", "guidanceCategory": "accessibility", "severity": "high", "confidence": "high", "summary": "Some text does not meet minimum color contrast.", "evidence": "Lighthouse’s color-contrast audit failed on the homepage.", "artifacts": [ "evidence/lighthouse-home.json" ], "suggestedFix": "Adjust foreground/background design tokens until text and essential UI meet WCAG contrast thresholds.", "effort": "medium" }, { "id": "F-be-private-and-secure-data-minimisation-and-third-parties", "pathId": "home", "url": "https://www.nikkei.com/", "principleId": "be-private-and-secure", "principleCheckId": "data-minimisation-and-third-parties", "guidanceId": "privacy", "guidanceCategory": "security-privacy", "severity": "high", "confidence": "high", "summary": "The homepage has a large tracking and third-party footprint.", "evidence": "Tracker evidence found 12 third-party origins including Facebook and Google Tag Manager; HAR attributes 59 requests and 1.34MB to non-main origins before consent interaction.", "artifacts": [ "evidence/trackers.json", "evidence/home-summary.json", "evidence/home-desktop.png" ], "suggestedFix": "Gate nonessential trackers on consent, remove low-value vendors, minimize events, and batch analytics.", "effort": "medium" }, { "id": "F-be-resilient-progressive-enhancement", "pathId": "home", "url": "https://www.nikkei.com/", "principleId": "be-resilient", "principleCheckId": "progressive-enhancement", "guidanceId": "stabilize-reactive-state", "guidanceCategory": "web-platform", "severity": "high", "confidence": "high", "summary": "Article identity and much rendered content are missing from the raw no-JavaScript representation.", "evidence": "Discoverability measured only 32% overlap for the representative article; its rendered title and h1 were absent from raw HTML. Homepage overlap was 43%.", "artifacts": [ "evidence/article-discoverability.json", "evidence/article-discoverability-crawler.png", "evidence/article-discoverability-rendered.png" ], "suggestedFix": "Server-render article title, heading and core text; hydrate enhancement behavior without replacing crawlable content.", "effort": "medium" }, { "id": "F-be-sustainable-third-party-and-media-budget", "pathId": "home", "url": "https://www.nikkei.com/", "principleId": "be-sustainable", "principleCheckId": "third-party-and-media-budget", "guidanceId": "privacy", "guidanceCategory": "security-privacy", "severity": "high", "confidence": "high", "summary": "Third-party transfer is disproportionate for a text-first news homepage.", "evidence": "Third-party origins account for 1.34MB of 1.65MB total transferred; the CMP alone transferred about 500KB across its origins.", "artifacts": [ "evidence/home-summary.json", "evidence/trackers.json" ], "suggestedFix": "Set and enforce a third-party byte/request budget, slim the CMP, and defer analytics/ad code.", "effort": "medium" }, { "id": "F-respect-user-preferences-respects-color-scheme", "pathId": "home", "url": "https://www.nikkei.com/", "principleId": "respect-user-preferences", "principleCheckId": "respects-color-scheme", "guidanceId": "dark-mode", "guidanceCategory": "web-platform", "severity": "medium", "confidence": "high", "summary": "The site ignores the user’s dark color-scheme preference.", "evidence": "The dark-emulated screenshot is visually identical to the light page; the probe reports colorScheme \"normal\", body text rgb(51,51,51), and no color-scheme media rules.", "artifacts": [ "evidence/home-dark.png", "evidence/preferences-probe.json" ], "suggestedFix": "Declare color-scheme and provide dark surface/text tokens with prefers-color-scheme or light-dark().", "effort": "medium" }, { "id": "F-respect-user-preferences-respects-contrast", "pathId": "home", "url": "https://www.nikkei.com/", "principleId": "respect-user-preferences", "principleCheckId": "respects-contrast", "guidanceId": "adapt-scrollbar-to-contrast-preferences", "guidanceCategory": "web-platform", "severity": "medium", "confidence": "high", "summary": "Contrast preferences are not explicitly supported and ordinary contrast defects remain.", "evidence": "The preference CSS probe found no prefers-contrast or forced-colors rules, and Lighthouse failed its color-contrast audit.", "artifacts": [ "evidence/preferences-probe.json", "evidence/lighthouse-home.json" ], "suggestedFix": "Add forced-colors/prefers-contrast adaptations and correct failing text/background color pairs.", "effort": "medium" }, { "id": "F-maximize-content-reduce-noise-semantic-dismissible-primitives", "pathId": "home", "url": "https://www.nikkei.com/", "principleId": "maximize-content-reduce-noise", "principleCheckId": "semantic-dismissible-primitives", "guidanceId": "declarative-dialog-popover-control", "guidanceCategory": "web-platform", "severity": "medium", "confidence": "high", "summary": "The consent overlay is not exposed as a semantic dialog.", "evidence": "The DOM probe found no dialog, role=dialog, or popover while the screenshot shows modal-like overlay content delivered through a third-party iframe.", "artifacts": [ "evidence/a11y-interaction-probe.json", "evidence/home-desktop.png" ], "suggestedFix": "Expose modal semantics, focus management, accessible naming, Escape handling, and platform dismiss behavior.", "effort": "medium" }, { "id": "F-be-fast-and-stable-efficient-resource-delivery", "pathId": "home", "url": "https://www.nikkei.com/", "principleId": "be-fast-and-stable", "principleCheckId": "efficient-resource-delivery", "guidanceId": "optimize-image-priority", "guidanceCategory": "web-platform", "severity": "medium", "confidence": "high", "summary": "Resource delivery is request-heavy and includes weak cache hygiene.", "evidence": "HAR recorded 113 requests and 1.65MB transferred; it identified an uncached 66.9KB campaign image and multiple high-priority tracking scripts.", "artifacts": [ "evidence/home-summary.json", "evidence/home.har" ], "suggestedFix": "Cache immutable assets, defer non-critical tracking/consent dependencies, and keep the critical request chain focused on lead content.", "effort": "medium" }, { "id": "F-be-fast-and-stable-trim-unused-and-duplicate-code", "pathId": "home", "url": "https://www.nikkei.com/", "principleId": "be-fast-and-stable", "principleCheckId": "trim-unused-and-duplicate-code", "guidanceId": "identify-heavy-scripts", "guidanceCategory": "web-platform", "severity": "medium", "confidence": "high", "summary": "Third-party code dominates the transferred payload.", "evidence": "HAR attributes 59 requests and 1.34MB, about 81% of transfer, to non-main origins; Lighthouse also reports missing source maps for large first-party JavaScript.", "artifacts": [ "evidence/home-summary.json", "evidence/lighthouse-home.json" ], "suggestedFix": "Audit and conditionally load analytics/CMP integrations; remove duplicate or low-value tags and ship source maps privately or publicly as policy allows.", "effort": "medium" }, { "id": "F-be-inclusive-zoom-reflow-targets-and-media", "pathId": "home", "url": "https://www.nikkei.com/", "principleId": "be-inclusive", "principleCheckId": "zoom-reflow-targets-and-media", "guidanceId": "fluid-scaling", "guidanceCategory": "web-platform", "severity": "medium", "confidence": "high", "summary": "Reflow succeeds, but target sizing remains inadequate.", "evidence": "The 360px layout has no horizontal overflow, but Lighthouse failed target-size and the probe recorded many controls below 24px high.", "artifacts": [ "evidence/home-mobile-layout.json", "evidence/lighthouse-home.json", "evidence/home-mobile.png" ], "suggestedFix": "Retain the fluid reflow and enlarge/space interactive hit areas without disabling user scaling.", "effort": "medium" }, { "id": "F-follow-best-practices-no-console-errors", "pathId": "home", "url": "https://www.nikkei.com/", "principleId": "follow-best-practices", "principleCheckId": "no-console-errors", "guidanceId": "html", "guidanceCategory": "web-platform", "severity": "medium", "confidence": "high", "summary": "The page logs browser errors during load.", "evidence": "Lighthouse failed errors-in-console; HAR also recorded failed Facebook, ad, tag-manager and ORB-blocked tracking requests.", "artifacts": [ "evidence/lighthouse-home.json", "evidence/home-summary.json" ], "suggestedFix": "Remove or guard failed integrations and keep expected third-party failures from surfacing as page errors.", "effort": "medium" }, { "id": "F-follow-best-practices-sound-document-and-assets", "pathId": "home", "url": "https://www.nikkei.com/", "principleId": "follow-best-practices", "principleCheckId": "sound-document-and-assets", "guidanceId": "optimize-image-priority", "guidanceCategory": "web-platform", "severity": "medium", "confidence": "high", "summary": "Image markup and delivery have widespread sizing/efficiency defects.", "evidence": "The image probe reports 95 of 100 images without width/height attributes, 35 oversized images, 82 below-fold images not lazy-loaded, and 43 legacy-format assets.", "artifacts": [ "evidence/images.json" ], "suggestedFix": "Emit intrinsic dimensions, responsive srcset/sizes, lazy-load below-fold images, and prefer AVIF/WebP where appropriate.", "effort": "medium" }, { "id": "F-be-discoverable-crawlable-and-mobile-friendly", "pathId": "home", "url": "https://www.nikkei.com/", "principleId": "be-discoverable", "principleCheckId": "crawlable-and-mobile-friendly", "guidanceId": "html", "guidanceCategory": "web-platform", "severity": "medium", "confidence": "high", "summary": "Some links are not crawlable.", "evidence": "Lighthouse failed crawlable-anchors even though the viewport meta and most sampled navigation links use real href values.", "artifacts": [ "evidence/lighthouse-home.json", "evidence/home-recon.json" ], "suggestedFix": "Replace JavaScript-only or malformed navigation targets with real href URLs and keep descriptive link text.", "effort": "medium" }, { "id": "F-be-private-and-secure-secure-transport-and-headers", "pathId": "home", "url": "https://www.nikkei.com/", "principleId": "be-private-and-secure", "principleCheckId": "secure-transport-and-headers", "guidanceId": "security", "guidanceCategory": "security-privacy", "severity": "medium", "confidence": "high", "summary": "Cookie and CSP posture has avoidable weaknesses.", "evidence": "The cookie probe found lux_uid without Secure and a 400-day analytics cookie; the response CSP only sets frame-ancestors while a meta CSP allows unsafe-inline and unsafe-eval across a very broad origin list.", "artifacts": [ "evidence/headers.json", "evidence/cookies.json", "evidence/home-recon.json" ], "suggestedFix": "Mark all HTTPS cookies Secure, shorten nonessential retention, and deploy an enforceable nonce/hash-based response CSP.", "effort": "medium" }, { "id": "F-be-sustainable-optimised-assets", "pathId": "home", "url": "https://www.nikkei.com/", "principleId": "be-sustainable", "principleCheckId": "optimised-assets", "guidanceId": "deliver-optimized-decorative-images", "guidanceCategory": "web-platform", "severity": "medium", "confidence": "high", "summary": "Image assets are frequently oversized or delivered in legacy formats.", "evidence": "The image audit found 35 oversized images, 43 legacy-format images and 6 without responsive sources.", "artifacts": [ "evidence/images.json", "evidence/home-summary.json" ], "suggestedFix": "Serve correctly sized AVIF/WebP variants with srcset/sizes and optimize decorative campaign assets.", "effort": "medium" }, { "id": "F-be-sustainable-no-wasteful-work", "pathId": "home", "url": "https://www.nikkei.com/", "principleId": "be-sustainable", "principleCheckId": "no-wasteful-work", "guidanceId": "deprioritize-background-fetches", "guidanceCategory": "web-platform", "severity": "medium", "confidence": "high", "summary": "Non-content background integrations perform substantial work on initial load.", "evidence": "The HAR recorded 59 third-party requests while Lighthouse reported forced reflow and the page loaded multiple analytics/tracking integrations.", "artifacts": [ "evidence/home-summary.json", "evidence/lighthouse-home.json", "evidence/trackers.json" ], "suggestedFix": "Defer background analytics until idle/consent, batch events, and remove integrations without measurable reader value.", "effort": "medium" }, { "id": "F-be-memory-efficient-no-leak-under-repeated-interaction", "pathId": "home", "url": "https://www.nikkei.com/", "principleId": "be-memory-efficient", "principleCheckId": "no-leak-under-repeated-interaction", "guidanceId": "manage-recurring-intervals", "guidanceCategory": "web-platform", "severity": "medium", "confidence": "medium", "summary": "Repeated menu interaction correlates with retained heap growth and needs leak investigation.", "evidence": "After 10 open/close cycles, the heap summary rose from 22.64MB/310,078 nodes to 24.30MB/330,095 nodes (about 7% bytes and 6.5% nodes). Separate browser sessions lower confidence, but constructor counts also rose.", "artifacts": [ "evidence/heap-baseline.json", "evidence/heap-post.json" ], "suggestedFix": "Profile the menu/CMP lifecycle in one session with baseline-target-final snapshots; remove retained listeners, timers, nodes or caches.", "effort": "medium" }, { "id": "F-implement-natural-interactions-view-transitions", "pathId": "home", "url": "https://www.nikkei.com/", "principleId": "implement-natural-interactions", "principleCheckId": "view-transitions", "guidanceId": "cross-document-transitions", "guidanceCategory": "web-platform", "severity": "low", "confidence": "high", "summary": "Cross-document navigation swaps are abrupt.", "evidence": "The platform probe found no authored view-transition rules while the representative navigation is an MPA with page-to-page route changes.", "artifacts": [ "evidence/a11y-interaction-probe.json", "evidence/home-desktop.png" ], "suggestedFix": "Use @view-transition { navigation: auto } with reduced-motion-safe shared-element treatment for stable global chrome.", "effort": "small" }, { "id": "F-adapt-to-the-form-factor-component-level-responsiveness", "pathId": "home", "url": "https://www.nikkei.com/", "principleId": "adapt-to-the-form-factor", "principleCheckId": "component-level-responsiveness", "guidanceId": "size-aware-styling", "guidanceCategory": "web-platform", "severity": "low", "confidence": "high", "summary": "Reusable components rely on viewport styling rather than container responsiveness.", "evidence": "The CSS capability probe found no authored @container rules despite cards and navigation components appearing in multiple widths.", "artifacts": [ "evidence/a11y-interaction-probe.json", "evidence/home-mobile.png", "evidence/listing-desktop.png" ], "suggestedFix": "Adopt container queries for reused card/list modules where their layout depends on available component width.", "effort": "small" }, { "id": "F-follow-best-practices-browser-platform-hygiene", "pathId": "home", "url": "https://www.nikkei.com/", "principleId": "follow-best-practices", "principleCheckId": "browser-platform-hygiene", "guidanceId": "html", "guidanceCategory": "web-platform", "severity": "low", "confidence": "high", "summary": "DevTools reports browser-platform hygiene issues.", "evidence": "Lighthouse failed inspector-issues and valid-source-maps for large first-party JavaScript.", "artifacts": [ "evidence/lighthouse-home.json" ], "suggestedFix": "Resolve DevTools Issues findings and publish usable source maps according to the site’s debugging/security policy.", "effort": "small" }, { "id": "F-be-memory-efficient-bounded-footprint", "pathId": "home", "url": "https://www.nikkei.com/", "principleId": "be-memory-efficient", "principleCheckId": "bounded-footprint", "guidanceId": "performance", "guidanceCategory": "performance", "severity": "low", "confidence": "medium", "summary": "The homepage has a relatively large live heap/DOM footprint for its initial state.", "evidence": "Baseline heap summary contains 310,078 nodes and 22.64MB self size before deliberate interaction.", "artifacts": [ "evidence/heap-baseline.json" ], "suggestedFix": "Reduce initial DOM/card population, virtualize or defer below-fold modules, and trim third-party object graphs.", "effort": "small" } ], "taskList": [ { "id": "T-01", "title": "Use a compact, non-obscuring consent surface where lawful, preserve equal Reject/Agree actions, and keep content readable.", "priority": 1, "findingIds": [ "F-maximize-content-reduce-noise-no-intrusive-interruptions" ], "guidanceId": "light-dismiss-a-dialog", "status": "open" }, { "id": "T-02", "title": "Provide at least 24×24 CSS px targets with adequate spacing, preferably 44px for primary mobile controls.", "priority": 2, "findingIds": [ "F-adapt-to-the-form-factor-input-modality-aware" ], "guidanceId": "accessibility", "status": "open" }, { "id": "T-03", "title": "Prioritize the lead image/content, reduce third-party competition, and validate LCP under mobile throttling.", "priority": 3, "findingIds": [ "F-be-fast-and-stable-good-core-web-vitals" ], "guidanceId": "performance", "status": "open" }, { "id": "T-04", "title": "Give every interactive link a computed accessible name and provide meaningful alt text while using empty alt for decorative images.", "priority": 4, "findingIds": [ "F-be-inclusive-names-roles-labels" ], "guidanceId": "accessibility", "status": "open" }, { "id": "T-05", "title": "Adjust foreground/background design tokens until text and essential UI meet WCAG contrast thresholds.", "priority": 5, "findingIds": [ "F-be-inclusive-sufficient-contrast" ], "guidanceId": "accessibility", "status": "open" }, { "id": "T-06", "title": "Gate nonessential trackers on consent, remove low-value vendors, minimize events, and batch analytics.", "priority": 6, "findingIds": [ "F-be-private-and-secure-data-minimisation-and-third-parties" ], "guidanceId": "privacy", "status": "open" }, { "id": "T-07", "title": "Server-render article title, heading and core text; hydrate enhancement behavior without replacing crawlable content.", "priority": 7, "findingIds": [ "F-be-resilient-progressive-enhancement" ], "guidanceId": "stabilize-reactive-state", "status": "open" }, { "id": "T-08", "title": "Set and enforce a third-party byte/request budget, slim the CMP, and defer analytics/ad code.", "priority": 8, "findingIds": [ "F-be-sustainable-third-party-and-media-budget" ], "guidanceId": "privacy", "status": "open" }, { "id": "T-09", "title": "Declare color-scheme and provide dark surface/text tokens with prefers-color-scheme or light-dark().", "priority": 9, "findingIds": [ "F-respect-user-preferences-respects-color-scheme" ], "guidanceId": "dark-mode", "status": "open" }, { "id": "T-10", "title": "Add forced-colors/prefers-contrast adaptations and correct failing text/background color pairs.", "priority": 10, "findingIds": [ "F-respect-user-preferences-respects-contrast" ], "guidanceId": "adapt-scrollbar-to-contrast-preferences", "status": "open" }, { "id": "T-11", "title": "Expose modal semantics, focus management, accessible naming, Escape handling, and platform dismiss behavior.", "priority": 11, "findingIds": [ "F-maximize-content-reduce-noise-semantic-dismissible-primitives" ], "guidanceId": "declarative-dialog-popover-control", "status": "open" }, { "id": "T-12", "title": "Cache immutable assets, defer non-critical tracking/consent dependencies, and keep the critical request chain focused on lead content.", "priority": 12, "findingIds": [ "F-be-fast-and-stable-efficient-resource-delivery" ], "guidanceId": "optimize-image-priority", "status": "open" }, { "id": "T-13", "title": "Audit and conditionally load analytics/CMP integrations; remove duplicate or low-value tags and ship source maps privately or publicly as policy allows.", "priority": 13, "findingIds": [ "F-be-fast-and-stable-trim-unused-and-duplicate-code" ], "guidanceId": "identify-heavy-scripts", "status": "open" }, { "id": "T-14", "title": "Retain the fluid reflow and enlarge/space interactive hit areas without disabling user scaling.", "priority": 14, "findingIds": [ "F-be-inclusive-zoom-reflow-targets-and-media" ], "guidanceId": "fluid-scaling", "status": "open" }, { "id": "T-15", "title": "Remove or guard failed integrations and keep expected third-party failures from surfacing as page errors.", "priority": 15, "findingIds": [ "F-follow-best-practices-no-console-errors" ], "guidanceId": "html", "status": "open" }, { "id": "T-16", "title": "Emit intrinsic dimensions, responsive srcset/sizes, lazy-load below-fold images, and prefer AVIF/WebP where appropriate.", "priority": 16, "findingIds": [ "F-follow-best-practices-sound-document-and-assets" ], "guidanceId": "optimize-image-priority", "status": "open" }, { "id": "T-17", "title": "Replace JavaScript-only or malformed navigation targets with real href URLs and keep descriptive link text.", "priority": 17, "findingIds": [ "F-be-discoverable-crawlable-and-mobile-friendly" ], "guidanceId": "html", "status": "open" }, { "id": "T-18", "title": "Mark all HTTPS cookies Secure, shorten nonessential retention, and deploy an enforceable nonce/hash-based response CSP.", "priority": 18, "findingIds": [ "F-be-private-and-secure-secure-transport-and-headers" ], "guidanceId": "security", "status": "open" }, { "id": "T-19", "title": "Serve correctly sized AVIF/WebP variants with srcset/sizes and optimize decorative campaign assets.", "priority": 19, "findingIds": [ "F-be-sustainable-optimised-assets" ], "guidanceId": "deliver-optimized-decorative-images", "status": "open" }, { "id": "T-20", "title": "Defer background analytics until idle/consent, batch events, and remove integrations without measurable reader value.", "priority": 20, "findingIds": [ "F-be-sustainable-no-wasteful-work" ], "guidanceId": "deprioritize-background-fetches", "status": "open" }, { "id": "T-21", "title": "Profile the menu/CMP lifecycle in one session with baseline-target-final snapshots; remove retained listeners, timers, nodes or caches.", "priority": 21, "findingIds": [ "F-be-memory-efficient-no-leak-under-repeated-interaction" ], "guidanceId": "manage-recurring-intervals", "status": "open" }, { "id": "T-22", "title": "Use @view-transition { navigation: auto } with reduced-motion-safe shared-element treatment for stable global chrome.", "priority": 22, "findingIds": [ "F-implement-natural-interactions-view-transitions" ], "guidanceId": "cross-document-transitions", "status": "open" }, { "id": "T-23", "title": "Adopt container queries for reused card/list modules where their layout depends on available component width.", "priority": 23, "findingIds": [ "F-adapt-to-the-form-factor-component-level-responsiveness" ], "guidanceId": "size-aware-styling", "status": "open" }, { "id": "T-24", "title": "Resolve DevTools Issues findings and publish usable source maps according to the site’s debugging/security policy.", "priority": 24, "findingIds": [ "F-follow-best-practices-browser-platform-hygiene" ], "guidanceId": "html", "status": "open" }, { "id": "T-25", "title": "Reduce initial DOM/card population, virtualize or defer below-fold modules, and trim third-party object graphs.", "priority": 25, "findingIds": [ "F-be-memory-efficient-bounded-footprint" ], "guidanceId": "performance", "status": "open" } ], "budget": { "pathCount": 6, "auditPasses": 1 }, "agent": "pi", "runId": "2026-07-20T05-52-43-612Z" }