Full Changelog

We expect this release to ship in the DevTools of Chrome 143, and to PageSpeed Insights within a week.

Core

• fix incorrect dpr used for responsive images advice (#16771)

Full Changelog

Release article

We expect this release to ship in the DevTools of Chrome 143, and to PageSpeed Insights within a week.

New contributors

Thanks to our new contributors 👽🐷🐰🐯🐻!

• Benjamin R Gibson @brgibson
• Leonardo Poletto @leopoletto

Notable Changes

• performance: remove audits replaced by performance insights (#16729)
• remove preload-fonts, uses-rel-preload audits (#16716)
• remove font-size audit (#16701)
• remove offscreen-images audit (#16748)
• remove no-document-write audit (#16750)
• remove uses-passive-event-listeners audit (#16751)
• remove third-party-facades audit (#16710)
• scoring: adjust a11y weights and document approach (#16624)

Core

• remove ResponseCompression artifact (#16755)
• remove OptimizedImages artifact (#16754)
• remove DOMStats artifact (#16753)
• remove CacheContents artifact (#16752)
• remove empty first-meaningful-paint audit (#16749)
• remove some unused computed artifacts (#16735)
• defer to trace engine for lcp-breakdown, ttfb (#16733)
• error on unknown category in onlyCategories (#16720)
• drop compat traces / devtoolsLogs artifacts (#16708)
• import json as modules (#16700)
• anchor-elements: don't consider ancestorListeners (#16731)
• dom-size-insight: add numericValue (#16741)
• emulation: always match host browser's version milestone (#16677)
• font-display-insight: disable entity sum for est. savings (#16746)
• image-delivery-insight: add node item for image (#16714)
• inspector-issues: remove empty arrays (#16736)
• legacy-javascript: update caniuse data (#16699)
• network-request: remove receiveHeadersStart M115 compat (#16738)
• server-response-time: defer to Document Latency insight (#16715)
• trace-elements: remove unused event types (#16734)
• trace-elements: handle shadow roots (#16718)

CLI

• improve description for form-factor flag (#16682)

Report

• add adornment to audit description when not scored (#13014)

Deps

• upgrade deps (#16760)
• remove parse-cache-control (#16747)
• upgrade trace_engine to 0.0.61 (#16745)
• upgrade @esbuild-kit/esm-loader to 2.6.5 (#16730)
• upgrade deps (#16724)
• upgrade trace_engine to 0.0.60 (#16723)
• remove es-main (#16697)
• bump chrome-launcher to 1.2.1 (#16696)
• upgrade testdouble, fix mock tests in Node 21+ (#16664)
• lighthouse-stack-packs: upgrade to 1.12.3 (#16727)

I18n

• import (#16759)

Tests

• update some comments (#16744)
• re-enable smoke test for lcp-breakdown-insight score (#16743)
• re-enable dom-size-insight node smoke test (#16742)
• enable smoke test for lcp lazy load in shadow tree (#16739)
• re-enable csp block smoke test, make less restrictive (#16728)
• re-enable startTimespan api test (#16703)
• devtools: sync e2e (#16694)
• server-response-time: enable lightrider test (#16737)
• viewer: re-enable test (#16740)

Misc

• replace dead link for insecure origins deprecation (#16711)
• upgrade typescript target to es2023 (#16316)
• fix core/scripts/legacy-javascript/examine-latest-run.js (#16706)
• update min supported node version to 22.19 (#16668)
• fix typos in a11y i18n doc comments (#16665)
• build: update devtools 3p readme, document debug build (#16695)
• proto: add ConfigSettings fields (#15616)
• structured-data: remove dead link (#16709)

Full Changelog

We expect this release to ship in the DevTools of Chrome 141, and to PageSpeed Insights within 2 weeks.

New contributors

Thanks to our new contributors 👽🐷🐰🐯🐻!

• uthem150 @uthem150
• Nirav Gondaliya @niravzxv

Core

• errors-in-console: truncate large errors (#16619)
• insights: passing score (not n/a) for empty results (#16639)
• non-composited-animations: separate custom CSS properties (#16627)

Report

• viewer: only disable save-gist button on successful save (#16618)

Deps

• upgrade deps (#16660)
• upgrade trace_engine to 0.0.59 (#16659)
• remove semver (#16655)
• upgrade tldts-icann (#16657)
• upgrade esbuild to 0.25.9 (#16652)
• upgrade / drop many dev deps (#16651)
• upgrade trace_engine to 0.0.58 (#16649)

I18n

• import (#16662)

Tests

• disable startTimespan api test (#16653)
• disable trusted-types-directive-present smoke test (#16620)
• smokehouse: log specific error message when missing tests path (#16648)

Misc

• use structuredClone instead of lodash cloneDeep (#16656)

Full Changelog

We expect this release to ship in the DevTools of Chrome 140, and to PageSpeed Insights within 2 weeks.

New contributors

Thanks to our new contributors 👽🐷🐰🐯🐻!

• Boluwatife Omosowon @bolu-tife
• Jonas Thelemann @dargmuesli

Core

• network-requests: add initiators to debugData (#16605)

I18n

• import (#16616)

Tests

• disable csp-block-all smoke test (#16598)

Misc

• revert json modules to fully support Node 20 (#16613)
• ci: clear devtools build cache (#16615)
• logger: bump to 2.0.2 (#16604)
• logger: update debug dep to v4 (#16601)
• treemap: fix sizes not showing for source map nodes (#16593)

Full Changelog

We expect this release to ship in the DevTools of Chrome 140, and to PageSpeed Insights within 1 week.

New Audits

• mitigate dom-based xss with trusted types (#16493)

Core

• tracehouse: fix OOM when computing attributable URLs (#16585)
• trusted-types-xss: add link to lighthouse docs (#16590)

Deps

• upgrade trace_engine to 0.0.57 (#16589)

Tests

• disable issues-mixed-content smoke test (#16586)
• add test for trace-engine-result (#16574)
• update expectations (#16580)
• devtools: avoid failure on Unknown VE Context (#16581)

Full Changelog

We expect this release to ship in the DevTools of Chrome 140, and to PageSpeed Insights within a week.

Core

• trace-engine-result: initialize SyntheticEventsManager (#16572)

Full Changelog

We expect this release to ship in the DevTools of Chrome 140, and to PageSpeed Insights within a week.

New contributors

Thanks to our new contributors 👽🐷🐰🐯🐻!

• demostanis @demostanis
• OronW @OronW
• Raffael Jesche @raffaelj

Notable Changes

The Performance category in the Lighthouse report now shows performance insight audits by default - read more here.

Core

• always include headers even for empty tables (#16534)
• expose error stack, artifact on runtimeError (#16524)
• cache-insight: fix wrong value being used for transfer size (#16562)
• config: throw an error if a filter is an empty array (#15118)
• crawlable-anchors: allow placeholder anchor elements (#16292)
• gather: add host DPR base artifact (#16559)
• gather: deprecate executionContext.evaluateAsync (#16518)
• insights: show estimated ms savings (#16563)
• inspector-issues: rename to elementAccessibilityIssue (#16561)
• link-text: use lang to check for only localized terms (#16526)
• network-dependency-tree-insight: add preconnect advice (#16557)
• plugins: support scoped npm packages (#16550)
• render-blocking-resources: change column label to Duration (#16519)
• timing-summary: suppress expected errors (#16520)
• trace-elements: remove sentry debugging for invalid impactedNodes (#16523)

Report

• show insight performance audits by default (#16552)
• fix 3p filter checkbox for insight audits (#16564)
• hide highlighter during print (#16544)
• remove custom focus outline styles (#16531)
• increase max width of 3-dot menu (#16530)
• hide treemap, view trace buttons when printing (#16529)

Deps

• upgrade trace_engine to 0.0.56 (#16565)
• upgrade deps (#16555)
• upgrade configstore to 7.0.0 (#16148)
• upgrade jest packages to 29.7.0 (#16147)
• sentry: upgrade to v9 (#16541)

Docs

• recipes: give explicit commands for first building Lighthouse (#16527)

Tests

• parallelize lantern database tests (#16545)

Misc

• chore: use "Note" indentation in readme (#16533)
• chore: reformat to reduce spurious newlines (#16038)
• chore: rename traceEngineData to parsedTrace (#16270)
• ci: fix logic for nightly publish cron (#16556)
• ci: prevent nightly publish if no changes in last day (#16547)
• deps: upgrade to eslint 9 (#16327)

Full Changelog

We expect this release to ship in the DevTools of Chrome 139, and to PageSpeed Insights within a couple days.

New contributors

Thanks to our new contributor 👽🐷🐰🐯🐻!

Ian Kerins @isker

Core

• emulation: bump chrome UA to m136 (#16489)
• insights: add a bunch of debugData (#16472)
• inspector-issues: remove trusted types csp issue filter (#16514)
• inspector-issues: add userReidentificationIssue to artifact (#16497)

Report

• remove innerHTML usage from insights announce icon (#16469)

Deps

• upgrade deps (#16515)
• upgrade trace_engine to 0.0.53 (#16496)
• bump chrome-launcher to 1.2.0 (#16479)

Clients

• lr: disable modern-http-insight (#16471)

Tests

• fix some lantern test failures (#16498)
• use newer trace in metrics test (#16492)

Misc

• import i18n messages as JSON modules (#16500)
• scripts: add bytes-in-trace script (#16477)
• treemap: hide unused-bytes view mode when missing data (#16478)
• treemap: highlight many nodes on hover in duplicate modules table (#16470)

Full Changelog

We expect this release to ship in the DevTools of Chrome 137, and to PageSpeed Insights within a few days.

New contributors

Thanks to our new contributors 👽🐷🐰🐯🐻!

Jack Franklin @jackfranklin
Rob Kodey @rkodey
Clément Barbaza @cba85

Notable Changes

The Performance category in the Lighthouse report now has an option to toggle "insights" - read more here.

Core

• disable invalidationTracking trace event to prevent crash (#16451)
• migrate audits from devtoolsLogs/traces to DevtoolsLog/Trace (#16448)
• modify scoreDisplayMode for insight audits to match Perf panel (#16432)
• use with import attributes for legacy-javascript, bump to node 18.20 (#16415)
• image-size-responsive: use real mimeType to exclude svg (#16443)
• insights: drop slow-css-selector-insight for now (#16457)
• insights: implement duplicated-javascript-insight (#16456)
• insights: add prominent toggle banner to report (#16461)
• insights: implement network-dependency-tree insight (#16407)
• optimized-images: ignore internal encoding errors (#16444)
• preload-fonts: add Stylesheets to required artifacts (#16421)
• stacks: correctly identify angular (#16439)
• third-party-cookies: update description (#16464)
• tracehouse: fixup parent tasks when fudging endTime (#16420)

Report

• add analytics hook for insights state (#16466)
• adjust insights notice banner, localize strings (#16463)
• add insights group description (#16455)
• associate insight audits with stack packs (#16440)
• tweak style of insight tables; use system font (#16434)
• support node inside list detail, use in insight audits (#16433)
• display insights when using toggle, even if hidden (#16431)

Deps

• upgrade trace_engine to 0.0.52 (#16465)
• upgrade trace_engine to 0.0.51 (#16447)
• upgrade deps (#16438)
• upgrade typescript to 5.8.2 (#16414)

Docs

• fix "standalone-template.html" broken link in report README (#16429)

Tests

• disable oopif-scripts smoke for devtools runner (#16446)

Misc

• prepare core/lib/legacy-javascript to be published to npm (#16416)
• treemap: represent sizes using transfer size (#16460)
• treemap: parse options properly from hash params (#16459)
• treemap: update coerceOptions to grab initialView (#16458)
• treemap: move table to right, remove Tabulator (#16428)
• treemap: set initial view mode from options (#16427)
• treemap: vary colors within bundle, update fonts (#16403)

Full Changelog

We expect this release to ship in the DevTools of Chrome 136, and to PageSpeed Insights within 2 weeks.

Core

• trace-engine-result: exclude failed source maps (#16412)