v12.2.1

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We expect this release to ship in the DevTools of Chrome 130, and to PageSpeed Insights within 2 weeks.

Core

• third-party-cookies: update description for 3PCD updates (#​16177, #​16158)
• uses-text-compression: ignore percent threshold for large savings (#​16165)

Deps

• upgrade puppeteer to 23.3.0 (#​16178, #​16161)
• upgrade axe-core to 4.10.0 (#​16162)

Clients

• devtools: require third-party-web to be provided (#​16166)

I18n

• support reusing the same placeholder for ICU (#​16159)

Tests

• pass logger to smokehouse runners to get log even on timeout (#​16175)
• update BUILD.gn due to upstream CDT change (#​16171)
• devtools: sync e2e (#​16174)
• devtools: sync e2e (#​16160)

Misc

• format lighthouse-result.proto (#​16170)

v12.2.0

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We expect this release to ship in the DevTools of Chrome 129, and to PageSpeed Insights within 2 weeks.

Core

• import lantern from trace engine (#​16092)
• long-tasks: link to latest guidance (#​16138)
• stylesheets: disable transient stylesheet detection (#​16121)
• third-party-summary: correct blocking time calculation (#​16117)
• trace-engine-result: disable invalidations handler (#​16142)

Deps

• upgrade trace_engine to 0.0.32 (#​16143)
• upgrade puppeteer to 22.15.0 (#​16139)
• upgrade third-party-web to 0.24.5 (#​16140)
• upgrade puppeteer to 22.13.1 (#​16123)
• upgrade typescript to 5.5.3 (#​16091)

Tests

• devtools: sync e2e (#​16120)
• treemap: ignore cookie deprecation error (#​16141)

Misc

• remove alertdesk from README (#​16133)
• build: update README.chromium when rolling devtools (#​16144)

v12.1.0

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We expect this release to ship in the DevTools of Chrome 128, and to PageSpeed Insights within 2 weeks.

New Contributors

Thanks to our new contributors 👽🐷🐰🐯🐻!

• Hamir Mahal @​hamirmahal
• angad-sethi @​angad-sethi
• Junaid Ramzan @​ajuni880

Notable Changes

• remove first-meaningful-paint metric (#​16047)

Core

• move simulator creation and network analysis to lib/lantern (#​16003)
• handle target crash at any point (#​15985)
• aria-allowed-role: fix title and description (#​16042)
• inspector-issues: add shared dictionary issue (#​15993)
• lantern: refactor to DevTools modules convention (#​16071)
• lantern: rename files to PascalCase (#​16068)
• lantern: remove last usages of Lighthouse NetworkRequest (#​16067)
• lantern: remove usage of Lighthouse constants module (#​16062)
• lantern: remove all LH types (#​16061)
• lantern: move tbt-util.js to lib/lantern (#​16058)
• lantern: separate TraceEngine specific code (#​16051)
• lantern: extract main thread events w/o TraceProcessor (#​16049)
• lantern: remove usage of Lighthouse's ProcessedNavigation (#​16048)
• lantern: use LCP instead of FMP for TTI simulation bounds (#​16046)
• lantern: use computed artifact to create graph using trace (#​16040)
• lantern: rename NetworkRequest record to rawRequest (#​16037)
• lantern: resolve some differences when using trace (#​16033)
• lantern: create network graph from trace (experimental) (#​16026)
• network: align headers end time with send when no data received (#​16044)
• network: fix time units in network quiet calc (#​16013)
• test: add generatable squoosh trace (#​15997)
• test: add generatable trace for paint metrics (#​15994)
• test: add generatable iframe trace (#​15995)
• types: add missing fields to Result.Category and NodeDetails (#​16006)

CLI

• stop treating chrome launcher kill() as async (#​15998)

Deps

• upgrade puppeteer to 22.11.1 (#​16070)
• upgrade chrome-launcher to 1.1.2 (#​16069)
• upgrade puppeteer to 22.10.0 (#​16054)
• upgrade third-party-web to 0.24.3 (#​16055)
• upgrade axe-core to 4.9.1 (#​16056)

I18n

• import (#​16080)

Docs

• remove await from chrome.kill() (#​15982)

Tests

• use newer traces in network-analyzer-test.js (#​16043)
• default to 0 for network trace data length (#​16041)
• update remaining old traces for Lantern (#​16039)
• use new trace in metrics-test for pwa (#​16025)
• update many test traces, support .json.gz (#​16007)
• add timeout to runSmokeTest (#​16017)
• fix devtools e2e test runner (#​16018)
• reduce expected value of render-blocking-requests smoke (#​16011)
• update interactive test trace (#​16001)
• use new button class name for devtools run script (#​15999)
• ci: remove reference to deleted smoke test (#​16010)
• lantern: fix some tests not running (#​16073)
• lantern: refactor to DevTools test convention (#​16072)
• lantern: remove usage of devtoolsLog in simulator tests (#​16065)
• lantern: remove usage of computed SpeedIndex (#​16064)
• lantern: remove usage of computed PageDependencyGraph (#​16063)
• lantern: use TraceEngine directly in test fixtures (#​16057)
• lantern: remove Speedline from Lantern unit test for now (#​16060)
• lantern: remove devtools log from tests (#​16050)

Misc

• change connectionId from string to number (#​15983)
• ci: fix deprecated node usage in checkout@v3 (#​16022)
• strings: fix WebAuthetication typo (#​16028)

v12.0.0

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We expect this release to ship in the DevTools of Chrome 126, and to PageSpeed Insights within 2 weeks.

New Contributors

Thanks to our new contributors 👽🐷🐰🐯🐻!

• Ashley Rich @​A5hleyRich
• MrAdib @​JohnAdib

Notable Changes

PWA Category Removal

As per Chrome’s updated Installability Criteria, Lighthouse has removed the PWA category. For future PWA testing, users will be directed to use the updated PWA documentation.

SEO Category Reorganization

The SEO category has been updated to reflect the priorities of Google search in 2024. As such, several audits have been removed or moved to other categories:

• The is-crawlable audit is now weighted high enough to fail the SEO category on its own. (#​15933)
• The viewport and font-size audits are no longer priorities for SEO, but are still important for UX in general so they have been moved to the best practices category. (#​15930)
• The plugins audit is no longer a priority for SEO and has been removed. (#​15928)
• The tap-targets audit is no longer a priority for SEO and has been replaced with the target-size audit in accessibility. (#​15906)

Overall Savings Deprecation

The overallSavingsMs value on performance diagnostic audits has been deprecated (#​15902). We recommend using metricSavings.LCP or metricSavings.FCP to understand the estimated metric savings of performance diagnostics.

🆕 New Audits

• The aria-conditional-attr, aria-deprecated-role and aria-prohibited-attr Axe checks have been added to the Lighthouse accessibility category. (#​15963)
• The redirects-http audit has been brought back, but will only passively check for a http -> https redirect if the provided URL happens to be on http (#​13548)

Other Audit Changes

• The layout-shifts-elements audit is removed. Improved layout shift information can be found in the layout-shifts audit. (#​15931)
• The no-unload-listeners audit is removed. Unload listeners are deprecated and are still flagged in the deprecations and bf-cache audits. (#​15874)
• The duplicate-id-active audit is removed because it's corresponding Axe check is deprecated. (#​15900)
• The uses-rel-preload and preload-fonts audits have been moved to the experimental config. Preload advice is still on hold and these audits were already in a disabled state. (#​15876)

💥 Breaking Changes

• split up CSSUsage artifact (#​15952)
• remove budgets (#​15950)
• remove relevant audits lists from config (#​15878)
• remove ScriptElements artifact (#​15879)
• config: use explicit diagnostic group (#​15901)
• service-worker: remove service-worker gatherer (#​15942)

Core

• remove pre-v10 compat for page graph construction (#​15948)
• a11y: re-enable target-size hidden audit (#​15888)
• driver: add sendCommandAndIgnore (#​15913)
• gather: handle crash if CDP target crashes (#​11840)
• lantern: always use flexible network ordering (#​14612)
• lantern: remove LR statistics (#​15946)
• lantern: inline rtt constant (#​15944)
• lantern: add LanternError and adapter to LH error (#​15937)
• lantern: correct overlapping tasks in CPU nodes (#​15938)
• lantern: duplicate isNonNetworkProtocol in lib/lantern (#​15936)
• lantern: replace usage of LH.Artifacts.ProcessedTrace (#​15905)
• lantern: move lantern metrics to lib/lantern (#​15875)
• metric: remove gatherContext mode check (#​15899)
• render-blocking: use trace engine as the source of truth (#​15839)
• runner: use early return for readability (#​15914)
• seo: support Persian in link-text audit (#​15949)
• target-size: use binary display mode (#​15910)

Report

• fix hidden audit handling for non-perf categories (#​15968)

Deps

• upgrade tldts-icann to 6.1.16 (#​15967)
• upgrade third-party-web to 0.24.2 (#​15966)
• upgrade puppeteer to 22.6.5 (#​15951)

Clients

• viewer: stop using legacy DOM api (#​15964)

I18n

• import (#​15958)

Docs

• bug-report: require users to read FAQs (#​14383)
• readme: add DeploymentHawk to the list of integrations (#​15847)

Tests

• refresh sample artifacts (#​15962)
• invalidate devtools build cache (#​15947)
• update network target type expectations (#​15916)

Misc

• deduplicate all the dom helpers (#​15960)
• merge changelog from branch-11 (#​15957)
• remove BenchmarkIndexes base artifact (#​15941)
• update public gatherer list (#​15940)
• remove residual lighthouse-cli file (#​15935)
• use "processing duration" instead of "processing time" for INP (#​15893)
• treemap: fix column sorting when some values are blank (#​15959)