6.1.0 (2020-06-25)

Full Changelog

We expect this release to ship to DevTools in Chrome 85 86, and to PageSpeed Insights within 2 weeks.

New Contributors

Thanks to our new contributors 👽🐷🐰🐯🐻!

• Loftie Ellis @lpellis
• Marvin Frachet @mfrachet
• Matt Hobbs @Nooshu
• Peter Marshall @psmarshall

Notable Changes

• If a page has publicly-accessible JavaScript source maps, Lighthouse will collect them to enhance the unused-javascript audit. In future versions of Lighthouse, source maps will be used for entirely new audits (#10990).
• The report now uses KiB instead of KB. This is simply a label change; the value was and still is equal to 1024 bytes (#10870).

New Audits

• long-tasks: a new performance diagnostic that shows the longest main-thread-blocking tasks during load (#10736)
• crawlable-anchors: a new SEO audit that checks that anchors link to resolvable URLs (#10662)

Core

• unused-javascript: increase threshold to 20KiB (#10906)
• layout-shift-elements: surface CLS contribution per shifted element (#10968)
• emulation: bump chrome versions (#10787)
• image-size-responsive: quantize DPRs (#10801)
• long-tasks: add startTime property (#10942)
• improve resilience of nodeId-dependent gatherers (#10877)
• median-run: add computeMedianRun to lib (#10859)
• preload: ignore cross-frame requests (#10847)
• new inspector issues gatherer for Audit.IssueAdded events (#10664)
• subRow refactor, rename to subItem (#10867, #10978)

Experimental

Features hidden behind the --preset=experimental flag.

• legacy-javascript: reduce polyfills, fix core-js import in test (#10937)
• legacy-javascript: use prescriptive language in title (#10850)
• legacy-javascript: fix core-js 3 detection (#10852)
• legacy-javascript: use third-party-web for scoring (#10849)
• duplicated-javascript: display transfer size (#10701)

Deps

• axe-core: upgrade to 3.5.5 (#10986)
• upgrade chrome-launcher@0.13.3 (#10911)
• snyk: update snyk snapshot (#10840, #10940, #10980, #11010)
• remove bundlesize (#10999)
• update to lhci 0.4.0 (#10828)

Report

• metrics: use css grid so metrics are aligned (#10789)
• don't dim disclaimer anchor links (#10981)
• use acronyms and round metrics for shorter calc url (#10954)
• update link for budgets audit (#10944)
• add trailing slash to web.dev links (#10967)
• fix the width of the 3-dots menu in topbar (#10855)
• updated method signature typing to remove focusevent cast (#10858)
• adjust LCP element description (#11018)
• renderer: fix null Util.i18n in PSI renderer (#10822)
• psi: show disclaimer and calclink (#10936)

Docs

• add note about git repo required for @lhci/cli usage (#11006)
• contributing: add tips for audit and gatherer PRs (#10690)
• readme: update programmatic usage recipe (#10878)
• readme: add new and updated integrations (#10838, #10901, #10826, #10818)

Tests

• move proto roundtrip json to .tmp/ (#10995)
• add heading key tests (#10746)
• run ToT and stable Chrome for smoke tests in github workflow (#10989)
• legacy-javascript: exit code 1 on failure (#10946)
• smoke: use --debug in github action (#10919)
• smokehouse: do not assert on flaky node path (#10827)

Misc

• rename subHeading to subItemsHeading (#10979, #10983)
• viewer: expose LHR as __LIGHTHOUSE_JSON__ (#10879)
• use more inclusive and descriptive language (#10949)
• update changelog for v6.0.0 (#10821, #10807)