Manifest position 986 · CrUX rank bucket 1000

https://weather.com

Coverage complete

Coverage-complete representative-template audit. Radar rendering did not expose map content in headless Chrome, so map-specific usability was not asserted; all atomic checks were nevertheless judged with other direct evidence.

Attempts

1 / 3

Judged checks

58 / 58

Blocked

Not run

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

All 58 atomic check outcomes

Principle / check	Status	Confidence	Evidence or reason
respect-user-preferences `respects-color-scheme`	issues	high	Screenshots under default and prefers-color-scheme: dark are visually identical: the consent surface and page remain fixed light/white, and the DOM probe found no site dark-theme response. F01 medium: The site does not adapt to the user’s dark colour preference.
respect-user-preferences `respects-reduced-motion`	pass	high	evaluate under prefers-reduced-motion: reduce found no running animations and scroll-behavior auto.
respect-user-preferences `respects-contrast`	pass	high	prefers-contrast screenshot retained visible controls/text; Lighthouse accessibility scored 100.
implement-natural-interactions `view-transitions`	issues	high	The comprehensive CSS probe found no view-transition rules even though daily, hourly, 10-day and radar are prominent state/route changes. F02 low: Forecast route and state changes do not use View Transitions.
implement-natural-interactions `scroll-driven-animations`	pass	high	CSS probe found no scroll-linked animation, and layout tests captured only content scrolling, so no main-thread scroll animation anti-pattern applies.
implement-natural-interactions `physical-gestures`	pass	high	Forecast navigation uses native links and native overflow scrolling; no custom pointermove gesture layer was observed.
provide-guided-navigation `scroll-state-aware-chrome`	issues	high	The DOM/CSS probe found no scroll timeline and the long hourly/10-day templates expose no progress or scroll-aware header state. F03 low: Long forecast pages do not expose scroll-state-aware chrome.
provide-guided-navigation `anchored-positioning`	issues	high	The page contains menu/dialog surfaces, while the CSS probe found no anchor-name, position-anchor, or position-try rules. F04 low: Menus and overlays are not built with CSS anchor positioning.
provide-guided-navigation `directs-attention`	pass	high	Forecast tabs expose Today, Hourly, 10-Day and Monthly destinations and preserve clear location context in page titles/headings.
maximize-content-reduce-noise `no-intrusive-interruptions`	issues	high	Desktop and mobile load screenshots show a blocking cookie dialog covering the primary weather content; on mobile it consumes nearly the full viewport. Reject all is equally prominent, which avoids a deceptive-choice finding. F05 medium: A first-visit consent dialog obscures the entire forecast until a choice is made.
maximize-content-reduce-noise `semantic-dismissible-primitives`	pass	high	The consent surface is exposed as role=dialog with explicit Accept all, Reject all and settings controls.
maximize-content-reduce-noise `reduced-chrome`	issues	high	Rendered today/10-day DOM includes repeated “Advertisement” slots and “Sponsored Content”; the HAR records 78 third-party requests, while core forecast pages devote substantial structure to non-content modules. F06 medium: Advertising and sponsored chrome repeatedly interrupt forecast content.
adapt-to-the-form-factor `responsive-no-horizontal-scroll`	pass	high	All four narrow layout probes reported viewport meta and 0 px horizontal overflow at 360×800.
adapt-to-the-form-factor `component-level-responsiveness`	pass	high	CSS probe found a container-query rule; forecast layouts reflowed to 360 px without overflow.
adapt-to-the-form-factor `input-modality-aware`	pass	high	Lighthouse accessibility scored 100 and focus probe showed a 3 px outline or focus ring on sampled primary controls; mobile controls remained operable.
support-core-task-success `clear-purpose-and-primary-action`	pass	high	Titles, location context, forecast tabs and current/forecast values make the weather task explicit on today, hourly and 10-day templates.
support-core-task-success `primary-flow-completion`	pass	high	Today, hourly and ten-day forecast destinations loaded complete London forecast data through real links without account gating.
support-core-task-success `clear-system-state-and-recovery`	pass	high	Synthetic missing route rendered a clear 404 explanation and recovery links to Video, Maps and Local Weather.
be-fast-and-stable `good-core-web-vitals`	issues	high	Lighthouse measured LCP 12.7 s, CLS 0.146 and TBT 530 ms (performance 45). The first-party trace was better at LCP 2.29 s and TBT 91.5 ms, showing variability but not negating the poor throttled result. F07 high: Lab loading performance misses the Core Web Vitals quality bar.
be-fast-and-stable `visual-stability`	issues	high	Lighthouse measured CLS 0.146, including a 0.135 shift from an animated skeleton; the narrow layout probes were stable after their observation window. F08 medium: Late forecast content causes measurable layout shift.
be-fast-and-stable `efficient-main-thread`	issues	high	Lighthouse reports 3.4 s main-thread work, 2.3 s JavaScript execution, and 530 ms TBT; the trace also captured a 141.5 ms long task. F09 high: JavaScript keeps the main thread busy during load.
be-fast-and-stable `efficient-resource-delivery`	issues	high	HAR captured 143 requests and 2.42 MB transferred, including two document redirects and multiple parser-discovered high-priority scripts; Lighthouse estimates 850 ms redirect waste and reports a 12.7 s LCP without fetchpriority. F10 high: The landing page ships a heavy, redirecting critical path.
be-fast-and-stable `trim-unused-and-duplicate-code`	issues	high	Lighthouse estimates 779 KiB unused JavaScript and 76 KiB legacy JavaScript. HAR shows 62 scripts and 2.09 MB script transfer, led by Taboola, Google Ads and Rubicon. F11 high: Large unused and legacy JavaScript dominates transfer cost.
be-inclusive `names-roles-labels`	issues	high	Lighthouse details multiple hourly links whose aria-label omits visible label content, and the DOM probe found five links plus several buttons with no text or aria-label. F12 medium: Some interactive controls have incomplete or mismatched accessible names.
be-inclusive `sufficient-contrast`	pass	high	Lighthouse accessibility scored 100 and the prefers-contrast capture retained visible text and controls.
be-inclusive `structure-and-focus`	pass	high	Main/nav/header/footer landmarks are present, a skip link appears on the 404 route, and sampled primary controls expose visible focus treatment.
be-inclusive `legible-text`	pass	high	Desktop/mobile captures and forecast DOM show readable text hierarchy and no horizontal clipping at 360 px.
be-inclusive `zoom-reflow-targets-and-media`	pass	high	Viewport allows scaling (no maximum-scale/user-scalable=no); all tested templates reflow at 360 px without overflow, and Lighthouse accessibility scored 100.
follow-best-practices `no-console-errors`	issues	high	Lighthouse captured React hydration error #418, FedCM NetworkError and missing en-GB translation messages in the console. F13 medium: The page logs runtime and hydration errors during load.
follow-best-practices `sound-document-and-assets`	pass	high	DOM reports html doctype, UTF-8 charset and valid viewport; image probe found dimensions on every img and no oversized rendered img in its sample.
follow-best-practices `browser-platform-hygiene`	issues	high	Lighthouse found a large first-party JavaScript chunk without a source map and 24 KiB minification savings. F14 low: Production debugging and asset hygiene is incomplete.
be-discoverable `title-and-description`	pass	high	Landing, hourly, ten-day, radar and login pages expose unique descriptive titles; landing has a descriptive meta description.
be-discoverable `crawlable-and-mobile-friendly`	issues	high	Lighthouse SEO found the hourly link text “More”; the DOM also includes empty links. The viewport and real hrefs otherwise passed. F15 medium: Some crawlable links use non-descriptive text.
be-discoverable `canonical-and-indexing-signals`	issues	high	Lighthouse reports hreflang="xc-MN" as an unexpected language code. Canonical, robots and sitemap signals were otherwise present and successful. F16 low: One hreflang entry is invalid.
be-discoverable `structured-and-shareable-metadata`	pass	high	Landing DOM contains 3 JSON-LD blocks and 4 Open Graph tags corresponding to visible weather/location content.
be-private-and-secure `secure-transport-and-headers`	issues	high	Headers probe found no CSP, X-Content-Type-Options, Referrer-Policy or Permissions-Policy; clickjacking protection was absent. Cookie probe found 15 cookies flagged insecure and extensive SameSite=None use. HTTPS and HSTS passed. F17 high: Core browser security headers and cookie attributes are incomplete.
be-private-and-secure `data-minimisation-and-third-parties`	issues	high	Tracker probe found 16 third-party origins and eight known trackers. HAR attributed 78 requests and 1.40 MB to third parties, including Taboola, DoubleClick, Rubicon and Amazon Ads. F18 high: The default page load has a large advertising and tracking footprint.
be-private-and-secure `in-context-permissions-and-modern-auth`	issues	high	The login DOM contains email/password controls and no WebAuthn/passkey affordance; no permission prompt fired on load. F19 medium: Sign-in exposes password-only authentication with no observed passkey path.
be-private-and-secure `defensive-browser-policies`	issues	high	Headers probe found no CSP, X-Content-Type-Options, Referrer-Policy or Permissions-Policy; clickjacking protection was absent. Cookie probe found 15 cookies flagged insecure and extensive SameSite=None use. HTTPS and HSTS passed. F17 high: Core browser security headers and cookie attributes are incomplete.
be-resilient `progressive-enhancement`	pass	high	Discoverability probe found 70% raw/rendered word coverage, with title, H1 and description in server HTML; it is not a JS shell.
be-resilient `resilient-runtime-behaviour`	pass	high	Forecast pages stabilised with low post-load CLS in layout probes and the consent dialog remained within both desktop and 360 px viewports.
be-resilient `offline-and-installable`	issues	high	A web app manifest exists, but the runtime probe found no controlling service worker; forecast access therefore has no demonstrated offline fallback. F20 low: The app-like weather experience has no active offline runtime.
be-resilient `network-and-http-failure-states`	pass	high	The representative 404 renders a useful explanation and links back to core weather surfaces rather than a blank shell.
be-internationalised `lang-dir-and-logical-properties`	pass	high	Rendered document declares lang=en-GB and dir=ltr; locale navigation offers many language/region variants.
be-internationalised `locale-aware-data`	pass	high	London forecasts render locale-appropriate “Friday 24 July”, 24-hour time and BST labels across hourly/daily templates.
be-internationalised `time-zone-correctness`	pass	high	Forecast headings explicitly state BST and all hourly entries progress coherently across the local day boundary.
be-trustworthy `no-dark-patterns`	pass	high	Consent offers equally prominent Accept all and Reject all actions plus settings; no confirmshaming or forced account gate was observed.
be-trustworthy `humane-error-handling`	pass	high	Empty login submission leaves both required controls invalid using native constraint validation; labels remain present and no data is lost.
be-trustworthy `trustworthy-input-assistance`	issues	high	Login DOM shows both email and password inputs with empty autocomplete attributes; the site-search input explicitly uses autocomplete="off". F21 medium: The sign-in fields omit standard autocomplete tokens.
be-trustworthy `safe-commercial-and-account-flows`	issues	high	The login DOM contains email/password controls and no WebAuthn/passkey affordance; no permission prompt fired on load. Login DOM shows both email and password inputs with empty autocomplete attributes; the site-search input explicitly uses autocomplete="off". F19 medium: Sign-in exposes password-only authentication with no observed passkey path. F21 medium: The sign-in fields omit standard autocomplete tokens.
be-sustainable `optimised-assets`	issues	high	Lighthouse reports the 256×256 Storm Radar PNG displayed around 70×70, with about 41 KiB potential savings; the image probe confirms a legacy PNG among otherwise SVG assets. F22 low: A footer raster image is oversized and inefficient.
be-sustainable `no-wasteful-work`	issues	high	HAR reports 1.40 MB third-party transfer across 78 requests; the largest scripts are recommendation and ad systems, while Lighthouse identifies their bundles as mostly unused. F23 high: Third-party script cost is disproportionate to the core forecast task.
be-sustainable `third-party-and-media-budget`	issues	high	HAR reports 1.40 MB third-party transfer across 78 requests; the largest scripts are recommendation and ad systems, while Lighthouse identifies their bundles as mostly unused. F23 high: Third-party script cost is disproportionate to the core forecast task.
be-agent-ready `structured-agent-capabilities`	not-applicable	high	No declared agent-facing transaction or tool surface was found; emerging WebMCP capability is optional here, while weather content remains machine-readable through server HTML and JSON-LD.
be-agent-ready `on-device-inference`	not-applicable	high	No summarisation or generative interaction is offered, so on-device inference has no concrete user task to serve in the audited forecast/account scope.
be-memory-efficient `no-leak-under-repeated-interaction`	pass	high	After 10 full-page scroll cycles, heap snapshot node count decreased by 393 and retained size changed only +10,284 bytes; DOM count stayed exactly 1,403.
be-memory-efficient `bounded-footprint`	pass	high	Baseline heap summary measured 623,558 nodes and 34.68 MB self size for the script-heavy forecast page; footprint remained stable after interaction.
be-memory-efficient `no-detached-dom-or-unbounded-listeners`	pass	high	Before/after heap constructor summaries show no Detached* population among top constructors; DOM count stayed 1,403 and closures decreased after repeated scroll.

Provenance

Canonical report: results/atomic/reports/0986-weather_com.json
Report SHA-256: 715234788b4a83edd51ce7d75f5f3433864eb4370b74c998db1bb24a7a95bc3b
Local retained report: runs/2026-07-17T17-27-24-856Z/atomic-reports/weather_com/2026-07-24T08-46-49-037Z/report.json
Local evidence root: runs/2026-07-17T17-27-24-856Z/atomic-reports/weather_com/2026-07-24T08-46-49-037Z
Catalog SHA-256: sha256:78ccfdb2d483f4c57d9dafed80fd86c6265585a56457c8dcfddc254b80fb44d7

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