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lighthouse v8.0.0 Release Notes

Release Date: 2021-06-02 // almost 3 years ago

  • Full Changelog

    🚀 We expect this release to ship in the DevTools of Chrome 93, and is already in PageSpeed Insights!

    Notable changes

    • 🐎 The Performance Category had a number of scoring changes to align with other performance tools and to better reflect the state of the web.
      • The Performance Score has been reweighted (#12577)
      • The TBT and FCP score curves have been updated (#12576, #12556)
      • CLS has been updated to its new, windowed definition (#12554)

    See the v8.0 Performance FAQ for more detail.

    • The report includes a new metric filter. Pick a metric to focus on the opportunities and diagnostics most relevant to improving just that metric:
    • 🚀 The Lighthouse Treemap is now available across all the major Lighthouse clients. If your site exposes source maps to Lighthouse, look for the "View Treemap" button to see a breakdown of your shipped JavaScript, filterable by size and coverage on load.

    🆕 New audits

    • 🔒 The new audit csp-xss has been added to Best Practices to evaluate Content Security Policies and suggest ways of making them more secure. This can be a challenging audit to pass depending on hosting environment and page content, so for now it is unscored (#12514, #12551)

    🤖💥 Breaking changes for programmatic users

    • 🚤 Legacy metrics estimated-input-latency and first-cpu-idle have been deprecated, unweighted, and hidden since Lighthouse 6. They have now been removed (#12553)
    • 👀 Starting with Node 13, Node is built with full-icu by default, so the very large intl polyfill has been removed from Lighthouse's dependencies. See the readme FAQ if you're stuck with small-icu but need localization support (#12426)
    • Long-time audit uses-webp-images has a new ID, modern-image-formats. WebP is now rather mainstream, and this frees the audit to start including details on other cutting-edge image formats in the future (#12535)
    • The image-elements artifact has been restructured for clarity (#12568)

    🧱 Core

    • navigate: only observe longtasks in PerfObserver (#12545)
    • script-treemap-data: do not create nodes with blank names (#12569)

    ⛏️👷 Fraggle Rock

    Support for auditing user flows (#11313)

    • ➕ add settings to gather context (#12574)
    • 🛠 fix usage of distributed conditional type (#12565)
    • 👌 support inspector-issues gatherer (#12530)
    • 👌 support tags-blocking-first-paint gatherer (#12527)
    • 👌 support response-compression gatherer (#12508)
    • align navigation-runner with legacy gather-runner (#12478)

    📔 Report

    • 👌 improve accessibility of metric filter (#12552)
    • treemap: add placeholder, gist, and file upload features (#12511)
    • 👍 treemap: support passing gzipped data in url (#12509, #12519)
    • viewer: fix gist icon (#12505)

    👥 Clients

    • 🛠 fix main session OOPIF checks for devtools (#12533)
    • render treemap button in all clients (#12516, #12570, #12590)
    • 🛠 backport proto formatting fixes (#12566)

    🌍 i18n

    ✅ 📋 Tests

    • 👷 run unit tests on all active node versions in CI (#12513)
    • 🔀 sync devtools webtests (#12578)
    • treemap: reduce debug.json (#12555)

    🕸️ Deps

    • ⚡️ update lighthouse-plugin-publisher-ads to 1.4.1 (#12592)
    • ⚡️ update axe-core to 4.2.1 (#12575)
    • ⚡️ update puppeteer to 9.1.1 (#12284)
    • ⚡️ update chrome-launcher to 0.14.0 (#12507)