{ "url": "https://www.mercadolivre.com.br", "auditedAt": "2026-07-28T02:29:09Z", "mode": "report", "status": "blocked", "statusDetail": "Audit stopped during recon as required because the public site could not be reached in Chrome. Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised. All 58 check rows are explicitly recorded as blocked; this run is not scored.", "page": { "appType": "unknown", "framework": "React-like error response", "notes": "The observed page was a Mercado Livre-branded error response, not the intended commerce homepage." }, "evidenceUsed": [ "screenshot", "dom", "evaluate-probe", "discoverability", "headers", "har", "Modern Web Guidance 0.0.172" ], "guidanceConsulted": [ "accessibility", "accessible-error-announcement", "adapt-scrollbar-to-contrast-preferences", "agentic-forms", "agentic-javascript-tools", "anchor-positioning-tab-underline", "animate-element-entry-exit", "animate-to-from-top-layer", "animate-to-intrinsic-sizes", "animated-select-picker", "apply-webgl-shaders", "autofill-address-form", "autofill-highlight-inputs", "autofill-payment-form", "autofill-sign-in-form", "autofill-sign-up-form", "batch-analytics-events", "brand-consistent-forms", "branded-select-styling", "break-up-long-tasks", "calculate-event-differentials", "calculate-total-foreground-time", "calculate-with-intrinsic-sizes", "capture-location-agnostic-data", "carousel-slide-effects", "carousel-snap-highlights", "child-state-based-styling", "complex-shapes", "component-specific-light-dark-theme", "conditional-async-dependencies", "consistent-cross-document-transitions", "content-based-styling", "coordinate-global-events", "cross-document-transitions", "css", "css-layout", "custom-select-picker-layouts", "customize-scrollbar-color-and-thickness", "dark-mode", "declarative-dialog-popover-control", "defer-rendering-heavy-content", "defer-work-until-scroll-ends", "deliver-optimized-decorative-images", "deprioritize-background-fetches", "design-token-reactivity", "detect-initial-visibility-state", "directional-navigation-transitions", "dynamic-sibling-animations", "dynamic-sibling-styling", "efficient-background-processing", "export-html-media-from-canvas", "expose-canvas-content-to-browser-features", "faster-spa-view-transitions", "flicker-free-client-side-ab-testing", "fluid-scaling", "form-fields-automatically-fit-contents", "format-human-readable-durations", "forms", "full-session-analytics", "group-element-transitions", "highlight-text-ranges", "html", "identify-heavy-scripts", "identify-inp-causes", "improve-next-page-load-performance", "improve-text-layout-and-legibility", "individual-transform-properties", "interactions-in-complex-layouts", "interactive-content-in-3d-scenes", "interactive-content-reveal", "interest-triggered-action-previews", "interest-triggered-tooltips", "language-detection", "language-model", "light-dismiss-a-dialog", "manage-recurring-intervals", "model-partial-time-concepts", "move-dom-element-without-losing-state", "navigation-drawer", "optimize-image-priority", "optimize-preload-priority", "optimize-script-priority", "overflow-clipping-control", "parallax-scroll-effects", "passkey-authentication", "passkey-conditional-create", "passkey-management", "passkey-reauthentication", "passkey-registration", "passkeys", "performance", "persistent-app-tours", "persistent-toast-notifications", "persistent-top-layer-ui", "physics-based-easing", "platform-controls-dismiss-dialog", "position-aware-tooltips", "precise-text-alignment", "prevent-text-wrapping", "privacy", "pull-to-reveal", "reduce-style-repetition", "required-field-feedback", "resilient-context-menus-and-nested-dropdowns", "resolution-optimized-pseudo-elements", "rich-media-picker", "same-document-transitions", "schedule-tasks-by-priority", "scroll-entry-exit-effects", "scroll-position-aware-elements", "scroll-progress-indicator", "scroll-snap-realtime-feedback", "scroll-snap-state-sync", "scroll-target-on-load", "scrollability-affordance-hints", "scrollytelling", "search-hidden-content", "security", "select-menu-interaction", "sequence-distributed-events", "shaped-cutouts", "shrinking-header-on-scroll", "size-aware-styling", "soft-edge-content-fade", "stabilize-reactive-state", "stack-drill-down", "style-parent-with-has", "summarizer", "support-global-calendar-systems", "swipe-to-remove", "translator", "validate-input-after-interaction", "visually-stable-font-fallbacks", "visually-stable-mixed-fonts", "visually-texture-content", "webmcp" ], "artifacts": [ { "type": "screenshot", "path": "evidence/home-desktop.png", "caption": "Desktop browser response: Mercado Livre error page.", "condition": "desktop viewport", "findingIds": [] }, { "type": "screenshot", "path": "evidence/home-mobile.png", "caption": "Mobile browser response: the same error page.", "condition": "viewport: 360x800", "findingIds": [] }, { "type": "dom", "path": "evidence/home-dom.json", "caption": "Rendered error-page DOM with no title, lang, viewport meta, or H1.", "condition": "desktop viewport", "findingIds": [] }, { "type": "other", "path": "evidence/recon.json", "caption": "Structured recon probe of the rendered error response.", "condition": "desktop viewport", "findingIds": [] }, { "type": "discoverability", "path": "evidence/discoverability.json", "caption": "Raw-fetch/rendered comparison; rendered browser remained on the error response.", "condition": "JavaScript on/off comparison", "findingIds": [] }, { "type": "screenshot", "path": "evidence/discoverability-rendered.png", "caption": "Rendered-browser side of discoverability comparison.", "condition": "JavaScript enabled", "findingIds": [] }, { "type": "screenshot", "path": "evidence/discoverability-crawler.png", "caption": "Crawler side of discoverability comparison.", "condition": "JavaScript disabled", "findingIds": [] }, { "type": "other", "path": "evidence/headers.json", "caption": "Headers observed on the blocked/error response; not treated as representative of the storefront.", "condition": "main document response", "findingIds": [] }, { "type": "har", "path": "evidence/home.har", "caption": "Network capture of blocked load; contains two HTTP 403 responses.", "condition": "5-second load window", "findingIds": [] }, { "type": "har-summary", "path": "evidence/home-summary.json", "caption": "Compact HAR summary showing 4 requests and two HTTP 403 responses.", "condition": "5-second load window", "findingIds": [] }, { "type": "other", "path": "coverage-manifest.json", "caption": "Atomic coverage manifest for all 58 registered checks.", "condition": "catalog modern-web-guidance@0.0.172", "findingIds": [] } ], "config": { "loaded": false }, "coverage": { "catalogVersion": "modern-web-guidance@0.0.172", "catalogChecksum": "sha256:78ccfdb2d483f4c57d9dafed80fd86c6265585a56457c8dcfddc254b80fb44d7", "expected": 58, "recorded": 58, "judged": 0, "blocked": 58, "notRun": 0, "missing": 0, "unknown": 0, "duplicates": 0, "complete": false }, "checkOutcomes": [ { "principleId": "respect-user-preferences", "checkId": "respects-color-scheme", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (a screenshot or computed background under an emulated prefers-color-scheme: dark condition will reveal whether surfaces re-tint; the page CSS / a color-scheme declaration is corroborating evidence. The model chooses the method.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "respect-user-preferences", "checkId": "respects-reduced-motion", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (a transition video, or an in-page probe of getAnimations()/computed animation under an emulated prefers-reduced-motion: reduce condition, can show whether motion stops. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "respect-user-preferences", "checkId": "respects-contrast", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (a screenshot under emulated prefers-contrast: more / forced-colors, or an axe/contrast probe, can show whether controls and text survive. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "implement-natural-interactions", "checkId": "view-transitions", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (a transition video of a route/state change shows whether it animates; the page source / ::view-transition usage corroborates. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "implement-natural-interactions", "checkId": "scroll-driven-animations", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (source/CSS inspection for animation-timeline: scroll()/view(); a long-task / scroll-handler probe can flag the main-thread anti-pattern. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "implement-natural-interactions", "checkId": "physical-gestures", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (CSS inspection for scroll-snap / overscroll-behavior / physics-based easing vs custom pointermove listeners. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "provide-guided-navigation", "checkId": "scroll-state-aware-chrome", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (a transition video of scrolling, or CSS inspection for scroll-state container queries. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "provide-guided-navigation", "checkId": "anchored-positioning", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (CSS inspection for anchor-name / position-anchor / position-try on overlays; a screenshot of an open overlay near a viewport edge can show drift. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "provide-guided-navigation", "checkId": "directs-attention", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (CSS inspection for ::highlight / scroll-marker; a transition video can show whether attention is cued after navigation. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "maximize-content-reduce-noise", "checkId": "no-intrusive-interruptions", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (a screenshot on load, or a DOM probe for full-viewport overlays present before interaction. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "maximize-content-reduce-noise", "checkId": "semantic-dismissible-primitives", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (DOM/source inspection for popover / /
vs custom overlay divs with manual dismiss handling. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "maximize-content-reduce-noise", "checkId": "reduced-chrome", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (a screenshot plus layout metrics can show the proportion of the viewport given to chrome vs content. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "adapt-to-the-form-factor", "checkId": "responsive-no-horizontal-scroll", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (layout metrics (scrollWidth vs innerWidth) and a screenshot at an emulated narrow mobile viewport reveal overflow. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "adapt-to-the-form-factor", "checkId": "component-level-responsiveness", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (CSS inspection for @container / container-type; a computed-style probe of the same component in a wide vs narrow container shows whether it adapts. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "adapt-to-the-form-factor", "checkId": "input-modality-aware", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (a focus probe (focus an element, read the computed outline) or an axe target-size check; a screenshot of a focused control corroborates. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "support-core-task-success", "checkId": "clear-purpose-and-primary-action", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (screenshot the first viewport and key scrolled states; inspect heading structure, nav labels, button text, and visual hierarchy; a task walkthrough can show whether the next action is obvious. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "support-core-task-success", "checkId": "primary-flow-completion", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (run the flow manually with screenshots/DOM snapshots at each step; compare expected vs actual path length; inspect form requirements, navigation continuity, and blockers. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "support-core-task-success", "checkId": "clear-system-state-and-recovery", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (exercise network delay/failure, invalid input, empty data and success states; screenshot the state messaging and recovery controls; inspect whether browser history and focus remain sensible. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "be-fast-and-stable", "checkId": "good-core-web-vitals", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (Lighthouse reports LCP/CLS/TBT directly and the model may run it; layout metrics + a layout-shift observer + a long-task observer (the evidence primitives) give the same signal first-party. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "be-fast-and-stable", "checkId": "visual-stability", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (the layout primitive's CLS observer captures shifts; a transition video of the first seconds shows content jumping. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "be-fast-and-stable", "checkId": "efficient-main-thread", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (the layout primitive records long tasks; a heap summary shows the object population; Lighthouse reports TBT. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "be-fast-and-stable", "checkId": "efficient-resource-delivery", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (a HAR summary can reveal cache headers, redirects, render-blocking candidates, weight offenders and dependency shape; a trace/Lighthouse insight report can corroborate LCP discovery, render-blocking, font-display and document latency. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "be-fast-and-stable", "checkId": "trim-unused-and-duplicate-code", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (Lighthouse/trace/code-coverage style evidence can flag unused JS/CSS, duplicated JavaScript and legacy code; a HAR summary shows third-party byte cost and request count. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "be-inclusive", "checkId": "names-roles-labels", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (axe-core (injectable via the evaluate primitive) or Lighthouse's a11y audits enumerate these; a DOM probe of the accessibility-relevant attributes is a first-party alternative. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "be-inclusive", "checkId": "sufficient-contrast", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (axe contrast rules, a Lighthouse contrast audit, or an in-page probe computing contrast ratios from computed colours. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "be-inclusive", "checkId": "structure-and-focus", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (axe/Lighthouse structural audits; a focus-walk probe (tab through, read activeElement + computed outline) is a first-party alternative. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "be-inclusive", "checkId": "legible-text", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (a screenshot of body and heading text, plus CSS inspection for text-wrap / text alignment / font fallback handling. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "be-inclusive", "checkId": "zoom-reflow-targets-and-media", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (Lighthouse/axe target-size, meta-viewport and media-caption audits are useful signals; screenshots at narrow and zoomed conditions plus DOM/media inspection can corroborate. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "follow-best-practices", "checkId": "no-console-errors", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (capture Runtime/Log CDP events, or a probe that reads collected errors; Lighthouse reports this too. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "follow-best-practices", "checkId": "sound-document-and-assets", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (a DOM/source probe for doctype/charset/img dimensions; CSS inspection for repetition; Lighthouse best-practices audits cover the rest. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "follow-best-practices", "checkId": "browser-platform-hygiene", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (Lighthouse best-practices audits and DevTools inspector/deprecation signals can surface these; DOM/source probes can verify paste handlers and prompt timing. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "be-discoverable", "checkId": "title-and-description", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (a DOM probe reads and meta[name=description]; Lighthouse SEO audits cover the same ground. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "be-discoverable", "checkId": "crawlable-and-mobile-friendly", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (a DOM probe for anchor hrefs, viewport meta, and robots; Lighthouse SEO audits corroborate. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "be-discoverable", "checkId": "canonical-and-indexing-signals", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (inspect response status and headers, <link rel=canonical>, hreflang links, robots meta, robots.txt and sitemap.xml; Lighthouse SEO audits cover several of these. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "be-discoverable", "checkId": "structured-and-shareable-metadata", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (inspect JSON-LD/microdata and social preview tags against visible content; Lighthouse has a manual structured-data audit, and ad-hoc probes can parse schema.org blocks. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "be-private-and-secure", "checkId": "secure-transport-and-headers", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (inspect response headers / page protocol via an evaluate probe or the network layer; Lighthouse best-practices flags HTTPS and CSP issues. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "be-private-and-secure", "checkId": "data-minimisation-and-third-parties", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (inspect network requests and third-party origins; a probe of analytics/beacon calls. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "be-private-and-secure", "checkId": "in-context-permissions-and-modern-auth", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (a probe for permission requests fired on load; source inspection for passkey / WebAuthn / navigator.credentials usage in auth flows. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "be-private-and-secure", "checkId": "defensive-browser-policies", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (inspect response headers and browser security state; Lighthouse/DevTools security audits can corroborate HSTS, clickjacking, Trusted Types, origin isolation and third-party cookie findings. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "be-resilient", "checkId": "progressive-enhancement", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (load with scripting disabled or compare a no-JS fetch of the HTML against the rendered page; check for Baseline-aware fallbacks in source. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "be-resilient", "checkId": "resilient-runtime-behaviour", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (exercise menus near viewport edges with a screenshot; a probe of async/visibility behaviour. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "be-resilient", "checkId": "offline-and-installable", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (a probe for a service worker registration and a web app manifest; test behaviour offline. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "be-resilient", "checkId": "network-and-http-failure-states", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (simulate failed fetches/offline mode or inspect representative 404/500 routes; screenshots and DOM snapshots of error/loading/empty states show whether recovery is possible. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "be-internationalised", "checkId": "lang-dir-and-logical-properties", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (a DOM probe for <html lang>/dir and CSS inspection for logical vs physical properties. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "be-internationalised", "checkId": "locale-aware-data", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (source inspection for Intl.* usage vs hand-rolled formatting; a probe of rendered dates/numbers under a different locale. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "be-internationalised", "checkId": "time-zone-correctness", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (source inspection for time-zone-aware date handling vs naive local Date math. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "be-trustworthy", "checkId": "no-dark-patterns", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (a screenshot of consent/upsell/cancel flows; source inspection for declarative button actions vs misleading controls. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "be-trustworthy", "checkId": "humane-error-handling", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (exercise a form, submit invalid input, and observe timing and clarity of errors via a screenshot or a :user-invalid / aria-invalid probe. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "be-trustworthy", "checkId": "trustworthy-input-assistance", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (source/DOM inspection for autocomplete attributes on form fields; a probe of autofill affordances. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "be-trustworthy", "checkId": "safe-commercial-and-account-flows", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (walkthrough checkout/subscription/auth/account flows when present; screenshot pricing, confirmation, cancellation and reauthentication states; inspect passkey/autocomplete support for sign-in and payment. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "be-sustainable", "checkId": "optimised-assets", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (inspect transferred image bytes vs displayed size; source inspection for modern formats and resolution handling. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "be-sustainable", "checkId": "no-wasteful-work", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (a long-task / network probe for background fetches and processing while idle or backgrounded. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "be-sustainable", "checkId": "third-party-and-media-budget", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (a HAR summary shows third-party bytes, font/media weight and caching; screenshots/video reveal autoplay and decorative media; trace/layout evidence shows whether media/animation keeps work running. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "be-agent-ready", "checkId": "structured-agent-capabilities", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (source inspection for WebMCP / agentic-tool registration and agent-readable affordances. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "be-agent-ready", "checkId": "on-device-inference", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (source inspection for built-in AI (language model / summariser) usage. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "be-memory-efficient", "checkId": "no-leak-under-repeated-interaction", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (compare heap snapshots for retained growth - a baseline, then one taken after repeating the interaction with `--interact` about 10x (the memory-tracer methodology: baseline -> repeat -> post -> compare). Performance.getMetrics (JSHeapUsedSize, Nodes) across the same before/after window is corroboration. If Chrome DevTools MCP is available, follow its memory-leak-debugging skill: capture baseline, target, and final snapshots, then use memlab or the provided comparison workflow rather than reading raw .heapsnapshot files directly. The package-native `heap` primitive remains the default path. This check is only meaningful where the page has a real interaction to repeat; for a static page with none, mark it not-applicable with a rationale rather than fabricating one. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "be-memory-efficient", "checkId": "bounded-footprint", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (a single `heap` summary's totals (nodeCount, totalSelfSizeBytes, constructor population) plus Performance.getMetrics (Nodes, JSHeapUsedSize) give the current footprint to judge against the page's purpose. Chrome DevTools MCP heap snapshots and memlab snapshot analysis can provide the same memory distribution when available. Read summaries or derived analysis, never raw snapshots unless a dedicated heap-analysis tool is doing the analysis. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] }, { "principleId": "be-memory-efficient", "checkId": "no-detached-dom-or-unbounded-listeners", "status": "blocked", "confidence": "high", "method": "Attempted planned check-specific inspection (the `heap` summary by constructor (Detached* nodes) compared across a before/after pair shows a growing detached-DOM population; an `evaluate` probe can sample listener/timer counts (e.g. getEventListeners-style counting, or instrumenting addEventListener/setInterval) before and after the repeated interaction to spot growth. Chrome DevTools MCP heap snapshots plus the memory-leak-debugging skill's common-leak guidance can corroborate detached DOM, listeners, closures, globals, and unbounded caches. Caveat from the memory-tracer and Chrome DevTools MCP guidance: detached nodes can be intentional caches, so judge confidence rather than asserting a bug. The model chooses.) after desktop/mobile recon, rendered DOM capture, and network capture.", "evidence": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "reason": "Chrome received Mercado Livre’s error/bot-block response instead of the public storefront: the rendered DOM has no title, lang, viewport meta or H1 and only says “Hubo un error accediendo a esta pagina...”; the HAR recorded two HTTP 403 responses. The intended page and journeys could not be exercised.", "artifacts": [ "evidence/home-desktop.png", "evidence/home-dom.json", "evidence/home-summary.json" ] } ], "principleOutcomes": [ { "principleId": "respect-user-preferences", "expectation": "default", "status": "incomplete", "reason": "All 3 registered checks were blocked because the target returned an error/403 response to the audit browser rather than the intended site." }, { "principleId": "implement-natural-interactions", "expectation": "default", "status": "incomplete", "reason": "All 3 registered checks were blocked because the target returned an error/403 response to the audit browser rather than the intended site." }, { "principleId": "provide-guided-navigation", "expectation": "default", "status": "incomplete", "reason": "All 3 registered checks were blocked because the target returned an error/403 response to the audit browser rather than the intended site." }, { "principleId": "maximize-content-reduce-noise", "expectation": "default", "status": "incomplete", "reason": "All 3 registered checks were blocked because the target returned an error/403 response to the audit browser rather than the intended site." }, { "principleId": "adapt-to-the-form-factor", "expectation": "default", "status": "incomplete", "reason": "All 3 registered checks were blocked because the target returned an error/403 response to the audit browser rather than the intended site." }, { "principleId": "support-core-task-success", "expectation": "default", "status": "incomplete", "reason": "All 3 registered checks were blocked because the target returned an error/403 response to the audit browser rather than the intended site." }, { "principleId": "be-fast-and-stable", "expectation": "default", "status": "incomplete", "reason": "All 5 registered checks were blocked because the target returned an error/403 response to the audit browser rather than the intended site." }, { "principleId": "be-inclusive", "expectation": "default", "status": "incomplete", "reason": "All 5 registered checks were blocked because the target returned an error/403 response to the audit browser rather than the intended site." }, { "principleId": "follow-best-practices", "expectation": "default", "status": "incomplete", "reason": "All 3 registered checks were blocked because the target returned an error/403 response to the audit browser rather than the intended site." }, { "principleId": "be-discoverable", "expectation": "default", "status": "incomplete", "reason": "All 4 registered checks were blocked because the target returned an error/403 response to the audit browser rather than the intended site." }, { "principleId": "be-private-and-secure", "expectation": "default", "status": "incomplete", "reason": "All 4 registered checks were blocked because the target returned an error/403 response to the audit browser rather than the intended site." }, { "principleId": "be-resilient", "expectation": "contextual", "status": "incomplete", "reason": "All 4 registered checks were blocked because the target returned an error/403 response to the audit browser rather than the intended site." }, { "principleId": "be-internationalised", "expectation": "contextual", "status": "incomplete", "reason": "All 3 registered checks were blocked because the target returned an error/403 response to the audit browser rather than the intended site." }, { "principleId": "be-trustworthy", "expectation": "default", "status": "incomplete", "reason": "All 4 registered checks were blocked because the target returned an error/403 response to the audit browser rather than the intended site." }, { "principleId": "be-sustainable", "expectation": "contextual", "status": "incomplete", "reason": "All 3 registered checks were blocked because the target returned an error/403 response to the audit browser rather than the intended site." }, { "principleId": "be-agent-ready", "expectation": "contextual", "status": "incomplete", "reason": "All 2 registered checks were blocked because the target returned an error/403 response to the audit browser rather than the intended site." }, { "principleId": "be-memory-efficient", "expectation": "default", "status": "incomplete", "reason": "All 3 registered checks were blocked because the target returned an error/403 response to the audit browser rather than the intended site." } ], "paths": [ { "id": "home", "description": "Homepage/storefront entry and recon. Selected to discover representative listing, product, search, sign-in, cart, and checkout paths, but the browser received an error/403 response before those archetypes could be identified or exercised.", "url": "https://www.mercadolivre.com.br", "conditions": [ "desktop viewport", "viewport: 360x800", "JavaScript disabled crawler comparison" ], "result": "failed" } ], "findings": [], "taskList": [], "budget": { "pathCount": 1, "auditPasses": 1 }, "agent": "pi", "runId": "2026-07-28T02-26-55-248Z" }