lighthouse
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Automated auditing, performance metrics, and best practices for the web.
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{
"high": {
"a": "2015-07-29",
"abbr": "2015-07-29",
"abortable-fetch": "2019-03-25",
"aborting": "2019-03-25",
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"typed-array-iteration-methods": "2016-09-20",
"typed-array-iterators": "2016-09-20",
"typed-arrays": "2015-07-29",
"u": "2015-07-29",
"unicode-point-escapes": "2015-09-30",
"unset-value": "2016-03-21",
"update": "2023-09-18",
"upgrade-insecure-requests": "2018-04-30",
"url": "2015-07-29",
"url-canparse": "2023-12-07",
"user-action-pseudos": "2015-07-29",
"user-activation": "2023-11-21",
"user-agent-sniffing": "2016-09-20",
"user-pseudos": "2023-11-02",
"var": "2015-07-29",
"vertical-align": "2015-07-29",
"video": "2015-07-29",
"viewport-unit-variants": "2022-12-05",
"viewport-units": "2017-10-17",
"visibility": "2015-07-29",
"visual-viewport": "2021-08-10",
"wasm": "2017-10-17",
"wasm-bigint": "2021-04-26",
"wasm-bulk-memory": "2021-10-25",
"wasm-exception-handling": "2022-05-03",
"wasm-multi-value": "2020-10-20",
"wasm-mutable-globals": "2020-03-24",
"wasm-non-trapping-float-to-int": "2021-10-25",
"wasm-reference-types": "2021-11-19",
"wasm-sign-extension-operators": "2021-04-26",
"wasm-simd": "2023-03-27",
"wasm-threads": "2021-12-13",
"wbr": "2015-07-29",
"weak-references": "2021-04-26",
"weakmap": "2015-07-29",
"weakset": "2015-09-30",
"web-animations": "2020-09-16",
"web-audio": "2021-04-26",
"web-cryptography": "2015-07-29",
"web-locks": "2022-03-14",
"webauthn": "2021-09-07",
"webauthn-public-key-easy": "2023-10-24",
"webgl": "2015-07-29",
"webgl-color-buffer-float": "2021-09-20",
"webgl-compressed-texture-astc": "2020-01-15",
"webgl-compressed-texture-etc": "2020-03-24",
"webgl-compressed-texture-etc1": "2020-03-24",
"webgl-debug-renderer-info": "2017-04-19",
"webgl-debug-shaders": "2020-09-16",
"webgl-depth-texture": "2015-07-29",
"webgl-lose-context": "2018-04-30",
"webgl-oes-draw-buffers-indexed": "2022-12-13",
"webgl2": "2021-09-20",
"webp": "2020-09-16",
"webrtc": "2020-01-15",
"webrtc-sctp": "2023-05-09",
"webrtc-stats": "2020-01-15",
"websockets": "2015-07-29",
"webvtt": "2015-07-29",
"webvtt-cue-settings": "2020-01-15",
"where": "2021-01-21",
"white-space": "2015-07-29",
"width-height": "2015-07-29",
"will-change": "2020-01-15",
"window": "2015-07-29",
"word-break": "2015-09-30",
"word-spacing": "2015-07-29",
"writing-mode": "2017-03-27",
"xhr": "2015-07-29",
"xml-serializer": "2015-07-29",
"xpath": "2015-07-29",
"xslt": "2015-07-29",
"z-index": "2015-07-29"
},
"low": {
"abortsignal-any": "2024-03-19",
"abortsignal-timeout": "2024-04-18",
"abs-sign": "2025-06-26",
"active-view-transition": "2026-01-13",
"align-content-block": "2024-04-16",
"alt-text-generated-content": "2024-07-09",
"array-fromasync": "2024-01-25",
"array-group": "2024-03-05",
"async-clipboard": "2024-06-11",
"atomics-pause": "2025-04-01",
"atomics-wait-async": "2025-11-11",
"avif": "2024-01-25",
"backdrop-filter": "2024-09-16",
"baseline-shift": "2026-03-24",
"canvas-2d-willreadfrequently": "2024-09-16",
"check-visibility": "2024-03-05",
"clipboard-supports": "2025-03-31",
"composed-ranges": "2025-08-19",
"container-style-queries": "2026-05-19",
"content-visibility": "2025-09-15",
"contenteditable-plaintextonly": "2025-03-04",
"contrast-color": "2026-04-10",
"cookie-enabled": "2024-09-16",
"crisp-edges": "2026-05-07",
"declarative-shadow-dom": "2024-02-20",
"details-content": "2025-09-16",
"details-name": "2024-09-03",
"document-caretpositionfrompoint": "2025-12-12",
"event-timing": "2025-12-12",
"fetch-priority": "2024-10-29",
"field-sizing": "2026-06-16",
"float16array": "2025-04-04",
"font-family-math": "2026-03-24",
"font-size-adjust": "2024-07-25",
"gethtml": "2024-09-16",
"getorinsert": "2026-02-14",
"gradient-interpolation": "2024-06-11",
"highlight": "2026-03-24",
"http3": "2024-09-16",
"input-file-webkitdirectory": "2025-08-19",
"intl-duration-format": "2025-03-04",
"intl-segmenter": "2024-04-16",
"invoker-commands": "2025-12-12",
"iterator-concat": "2026-03-24",
"iterator-methods": "2025-03-31",
"js-modules-service-workers": "2026-01-13",
"js-modules-shared-workers": "2026-05-05",
"json-modules": "2025-04-29",
"json-raw": "2025-03-31",
"largest-contentful-paint": "2025-12-12",
"light-dark": "2024-05-13",
"link-rel-dns-prefetch": "2025-09-15",
"math-sum-precise": "2026-04-10",
"navigation": "2026-01-13",
"open-pseudo": "2026-05-11",
"page-setup": "2024-12-11",
"paint-order": "2024-03-22",
"parse-html-unsafe": "2025-09-15",
"popover": "2025-01-27",
"print-color-adjust": "2025-05-01",
"promise-try": "2025-01-07",
"promise-withresolvers": "2024-03-05",
"rcap": "2026-01-13",
"rch": "2026-01-13",
"readable-byte-streams": "2026-03-24",
"rect-xywh": "2024-01-23",
"regexp-escape": "2025-05-01",
"registered-custom-properties": "2024-07-09",
"relative-color": "2024-09-16",
"reporting": "2026-03-24",
"reporting-csp-violations": "2026-03-24",
"request-video-frame-callback": "2024-10-29",
"requestclose": "2025-05-27",
"resizable-buffers": "2024-07-09",
"rex": "2026-01-13",
"ric": "2026-01-13",
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"ruby-align": "2024-12-11",
"ruby-position": "2024-12-11",
"scope": "2025-12-12",
"screen-wake-lock": "2025-03-31",
"scroll-to-text-fragment": "2024-10-01",
"scrollbar-color": "2025-12-12",
"scrollbar-gutter": "2024-12-11",
"scrollbar-width": "2024-12-11",
"scrollend": "2025-12-12",
"set-methods": "2024-06-11",
"shape-function": "2026-02-24",
"shared-workers": "2026-05-05",
"starting-style": "2024-08-06",
"state": "2024-05-17",
"target-text": "2024-12-11",
"text-decoration-skip-ink-all": "2026-05-07",
"text-decoration-spelling-grammar": "2025-12-12",
"text-indent-each-line": "2026-03-13",
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"text-wrap": "2024-10-17",
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"toggleevent-source": "2026-05-11",
"transferable-arraybuffer": "2024-03-05",
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"transition-behavior": "2024-08-06",
"trusted-types": "2026-02-24",
"uint8array-base64-hex": "2025-09-05",
"urlpattern": "2025-09-15",
"vertical-form-controls": "2024-04-18",
"view-transition-class": "2025-10-14",
"view-transitions": "2025-10-14",
"wasm-branch-hinting": "2026-02-24",
"wasm-extended-constant-expressions": "2024-03-05",
"wasm-garbage-collection": "2024-12-11",
"wasm-tail-call-optimization": "2024-12-11",
"wasm-typed-fun-refs": "2024-09-16",
"webgl-color-management": "2024-10-29",
"webgl2-color-management": "2024-10-29",
"webrtc-encoded-transform": "2025-10-03",
"webtransport": "2026-03-24",
"white-space-collapse": "2024-03-19",
"zoom": "2024-05-14",
"zstd": "2026-02-11"
},
"limited": [
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"accent-color",
"accessor-methods",
"ad-selection",
"alignment-baseline",
"alternative-style-sheets",
"ambient-light",
"anchor-positioning",
"anchor-positioning-transforms",
"app-file-handlers",
"app-launch-handler",
"app-migration",
"app-protocol-handlers",
"app-share-targets",
"app-shortcuts",
"arguments-callee",
"arianotify",
"async-iterable-streams",
"attr",
"attribution-reporting",
"audio-session",
"audio-video-tracks",
"audiolistener",
"audiolistener-setposition-setorientation",
"autocapitalize",
"autocorrect",
"autofill",
"background-attachment",
"background-clip-border-area",
"background-clip-text",
"background-fetch",
"background-sync",
"badging",
"barcode",
"baseline-source",
"battery",
"beforeinstallprompt",
"beforeunload",
"bfcache-blocking-reasons",
"blocking-render",
"border-shape",
"box-decoration-break",
"calc-size",
"canvas-2d-alpha",
"canvas-2d-color-management",
"canvas-2d-desynchronized",
"canvas-context-lost",
"canvas-html",
"capture-handle",
"capture-stream-audio-video",
"caret-shape",
"case-sensitive-attributes",
"clear-site-data",
"clip",
"clipboard-custom-format",
"clipboard-svg",
"clipboard-unsanitized-formats",
"clipboardchange",
"closewatcher",
"color-adjust",
"color-contrast",
"color-mix-variadic",
"colrv1",
"column-breaks",
"column-pseudo",
"compression-dictionary-transport",
"compute-pressure",
"contact-picker",
"container-anchor-position-queries",
"container-scroll-state-queries",
"content-index",
"context-fill-stroke",
"controls-list",
"cookie-store",
"corner-shape",
"counter-reset-reversed",
"cross-document-view-transitions",
"cross-fade",
"css-modules",
"css-object-model-discouraged",
"css-typed-om",
"cursor",
"custom-ellipses",
"custom-media-queries",
"customizable-select",
"customized-built-in-elements",
"datalist",
"date-get-year-set-year",
"date-to-gmt-string",
"declarative-webmcp",
"device-bound-session-credentials",
"device-memory",
"device-posture",
"device-queries",
"devicepixelratio",
"dialog-closedby",
"digital-credentials",
"digital-goods",
"display-animation",
"display-contents",
"display-mode",
"display-ruby",
"document-colors",
"document-modelcontext",
"document-picture-in-picture",
"document-write",
"dynamic-range-limit",
"early-data",
"edit-context",
"element",
"element-capture",
"element-timing",
"escape-unescape",
"execcommand",
"explicit-resource-management",
"ext-disjoint-timer-query",
"ext-float-blend",
"ext-frag-depth",
"ext-shader-texture-lod",
"ext-texture-compression-bptc",
"ext-texture-compression-rgtc",
"ext-texture-norm16",
"external",
"eyedropper",
"fast-seek",
"feature-policy",
"fedcm",
"federated-credentials",
"fencedframe",
"fetch-formdata",
"fetch-metadata",
"fetch-request-streams",
"fetchlater",
"file-system-access",
"filter-function",
"fit-content-function",
"focusgroup",
"font-family-ui",
"font-language-override",
"font-metric-overrides",
"font-palette-animation",
"font-synthesis-position",
"font-variant-emoji",
"font-variant-position",
"font-width",
"fullscreen",
"function",
"functions-caller-arguments",
"gamepad-haptics",
"gamepad-touch",
"gamepad-vr",
"gap-decorations",
"geolocation-element",
"getallrecords",
"getboxquads",
"glyph-orientation-vertical",
"gpc",
"gyroscope",
"hanging-punctuation",
"has-slotted",
"heading-offset",
"heading-selectors",
"hidden-until-found",
"highlightsfrompoint",
"host-context",
"html-media-capture",
"html-wrapper-methods",
"hyphenate-limit-chars",
"idle-detection",
"if",
"iframe-credentialless",
"image-function",
"ime-mode",
"import-assertions",
"initial-letter",
"ink",
"input-color",
"input-color-alpha",
"insertable-streams",
"install",
"interactivity",
"interest-invokers",
"interpolate-size",
"intersection-observer-v2",
"intl-locale-info",
"inverted-colors",
"is-error",
"is-input-pending",
"jpegxl",
"justify-self-block",
"keyboard-lock",
"keyboard-map",
"khr-parallel-shader-compile",
"languagedetector",
"languagemodel",
"layout-instability",
"light-dark-image",
"line-clamp",
"link-rel-expect",
"link-rel-prefetch",
"loading-lazy-media",
"local-fonts",
"local-network-access",
"long-animation-frames",
"longtasks",
"magnetometer",
"managed-media-source",
"manifest",
"manifest-localization",
"margin-trim",
"marker",
"mask-border",
"masonry",
"mathml-full",
"measure-memory",
"media-pseudos",
"media-session",
"media-source",
"mediacontroller",
"meta-application-title",
"meta-text-scale",
"meta-theme-color",
"mixin",
"move-before",
"mutation-events",
"navigation-precommit-handlers",
"navigation-timing-confidence",
"navigator-install",
"network-information",
"non-cookie-storage-access",
"notifications",
"numeric-factory-functions",
"object-view-box",
"observable",
"oes-texture-half-float-linear",
"opaquerange",
"orientation-sensor",
"origin",
"overflow-anchor",
"overflow-clip-margin",
"overflow-overlay",
"overlay",
"overscroll-behavior",
"ovr-multiview2",
"page-break-aliases",
"page-lifecycle",
"page-orientation",
"page-selectors",
"page-visibility-state",
"paint",
"partitioned-cookies",
"password-credentials",
"path-shape",
"payment-handler",
"payment-request",
"performancetiming",
"periodic-background-sync",
"permissions-policy",
"picture-in-picture",
"ping",
"pointer-lock",
"popover-hint",
"portal",
"prefers-reduced-data",
"prefers-reduced-transparency",
"presentation-api",
"private-click-measurement",
"private-network-access",
"profiler",
"progress-function",
"protected-audience",
"proto",
"random-function",
"readablestream-from",
"reading-flow",
"referencetarget",
"regexp-compile",
"regexp-static-properties",
"region-capture",
"registerprotocolhandler",
"related-apps",
"related-website-sets",
"remote-playback",
"reporting-coep-violations",
"reporting-crashes",
"reporting-crashes-storage",
"reporting-deprecation",
"reporting-integrity-violations",
"reporting-interventions",
"reporting-permissions-policy-violations",
"requestidlecallback",
"resize",
"rhythmic-sizing",
"ruby-overhang",
"sanitizer",
"savedata",
"scheduler",
"scoped-custom-element-registries",
"screen-capture",
"screen-orientation-lock",
"scroll-buttons",
"scroll-driven-animations",
"scroll-initial-target",
"scroll-into-view-container",
"scroll-marker-targets",
"scroll-markers",
"scroll-snap-events",
"scroll-target-group",
"secure-payment-confirmation",
"selection",
"serial",
"serializable-errors",
"service-workers-static-routes",
"share",
"shared-storage",
"shared-storage-locks",
"show-picker-input",
"show-picker-select",
"sibling-count",
"signature-based-resource-integrity",
"sizes-auto",
"smooth",
"speak",
"speak-as",
"speculation-rules",
"speech-recognition",
"speech-recognition-grammar",
"spelling-grammar-error",
"storage-buckets",
"stretch",
"style-query-range-syntax",
"summarizer",
"supports-at-rule",
"svg-discouraged",
"switch-control",
"table-discouraged",
"target-within",
"temporal",
"text-autospace",
"text-box",
"text-decoration-line-blink",
"text-decoration-selection",
"text-fit",
"text-justify",
"text-size-adjust",
"text-spacing-trim",
"text-wrap-pretty",
"time-relative-selectors",
"top-level-await",
"topics",
"touch-events",
"transferable-streams",
"transformstream-transformer-cancel",
"translator",
"ua-client-hints",
"url-cross-origin",
"url-integrity",
"url-referrer-policy",
"user-select",
"usermedia",
"vibration",
"video-dynamic-range",
"view-transitions-element-scoped",
"viewport-segments",
"virtual-keyboard",
"virtual-pressure-sources",
"virtual-sensors",
"wasm-exnref-exceptions",
"wasm-jspi",
"wasm-memory64",
"wasm-multi-memory",
"wasm-simd-relaxed",
"wasm-string-builtins",
"web-animations-iterationcomposite",
"web-bluetooth",
"web-midi",
"web-nfc",
"web-otp",
"webauthn-signals",
"webcodecs",
"webdriver",
"webdriver-bidi",
"webgl-compressed-texture-pvrtc",
"webgl-compressed-texture-s3tc",
"webgl-compressed-texture-s3tc-srgb",
"webgl-desynchronized",
"webgl-draw-buffers",
"webgl-multi-draw",
"webgl-sab",
"webgl2-desynchronized",
"webgpu",
"webgpu-subgroups",
"webhid",
"webnn",
"webusb",
"webvr",
"webvtt-cue-alignment",
"webvtt-regions",
"webxr-anchors",
"webxr-ar",
"webxr-camera",
"webxr-depth-sensing",
"webxr-device",
"webxr-dom-overlays",
"webxr-gamepads",
"webxr-hand-input",
"webxr-hit-test",
"webxr-layers",
"webxr-lighting-estimation",
"wheel-events",
"widows-orphans",
"window-controls-overlay",
"window-management",
"with",
"word-break-auto-phrase",
"word-break-break-word",
"writing-mode-svg-values",
"writingsuggestions"
]
}