{"id":92984,"date":"2022-10-20T23:45:39","date_gmt":"2022-10-20T21:45:39","guid":{"rendered":"https:\/\/rmarketingdigital.com\/dev\/whats-new-in-lighthouse-6-0\/"},"modified":"2020-10-18T06:22:42","modified_gmt":"2020-10-18T09:22:42","slug":"whats-new-in-lighthouse-6-0","status":"publish","type":"post","link":"https:\/\/rmarketingdigital.com\/en\/dev\/whats-new-in-lighthouse-6-0\/","title":{"rendered":"What&#039;s New in Lighthouse 6.0"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/rmarketingdigital.com\/en\/dev\/whats-new-in-lighthouse-6-0\/#New-metrics\" >New metrics<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/rmarketingdigital.com\/en\/dev\/whats-new-in-lighthouse-6-0\/#Largest-Contentful-Paint-LCP\" >Largest Contentful Paint (LCP)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/rmarketingdigital.com\/en\/dev\/whats-new-in-lighthouse-6-0\/#Cumulative-Layout-Shift-CLS\" >Cumulative Layout Shift (CLS)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/rmarketingdigital.com\/en\/dev\/whats-new-in-lighthouse-6-0\/#Total-Blocking-Time-TBT\" >Total Blocking Time (TBT)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/rmarketingdigital.com\/en\/dev\/whats-new-in-lighthouse-6-0\/#Performance-score-update\" >Performance score update<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/rmarketingdigital.com\/en\/dev\/whats-new-in-lighthouse-6-0\/#Shifts-in-scores\" >Shifts in scores<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/rmarketingdigital.com\/en\/dev\/whats-new-in-lighthouse-6-0\/#Scoring-calculator\" >Scoring calculator<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/rmarketingdigital.com\/en\/dev\/whats-new-in-lighthouse-6-0\/#New-audits\" >New audits<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/rmarketingdigital.com\/en\/dev\/whats-new-in-lighthouse-6-0\/#Unused-JavaScript\" >Unused JavaScript<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/rmarketingdigital.com\/en\/dev\/whats-new-in-lighthouse-6-0\/#Accessibility-audits\" >Accessibility audits<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/rmarketingdigital.com\/en\/dev\/whats-new-in-lighthouse-6-0\/#Maskable-icon\" >Maskable icon<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/rmarketingdigital.com\/en\/dev\/whats-new-in-lighthouse-6-0\/#Charset-declaration\" >Charset declaration<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/rmarketingdigital.com\/en\/dev\/whats-new-in-lighthouse-6-0\/#Lighthouse-CI\" >Lighthouse CI<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/rmarketingdigital.com\/en\/dev\/whats-new-in-lighthouse-6-0\/#Mobile-emulation\" >Mobile emulation<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/rmarketingdigital.com\/en\/dev\/whats-new-in-lighthouse-6-0\/#Browser-extension\" >Browser extension<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/rmarketingdigital.com\/en\/dev\/whats-new-in-lighthouse-6-0\/#Budgets\" >Budgets<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/rmarketingdigital.com\/en\/dev\/whats-new-in-lighthouse-6-0\/#Source-location-links\" >Source location links<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/rmarketingdigital.com\/en\/dev\/whats-new-in-lighthouse-6-0\/#On-the-horizon\" >On the horizon<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/rmarketingdigital.com\/en\/dev\/whats-new-in-lighthouse-6-0\/#Thank-you\" >Thank you!<\/a><\/li><\/ul><\/nav><\/div>\n<p><\/p>\n<div>\n<header class=\"w-article-header\">\n<p class=\"w-article-header__subhead w-mb--non\">\n          New metrics, Performance score update, new audits, and more.\n        <\/p>\n<p>\n          <time>May 19, 2020<\/time><\/p>\n<\/header>\n<p>Today we&#039;re releasing Lighthouse 6.0!<\/p>\n<p><a rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\/\/github.com\/GoogleChrome\/lighthouse\/\">Lighthouse<\/a> is an automated website auditing tool that<br \/>\nhelps developers with opportunities and diagnostics to improve the user experience of their sites.<br \/>\nIt&#039;s available in Chrome DevTools, npm (as a Node module and a CLI), or as a browser extension (in<br \/>\n<a rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\/\/chrome.google.com\/webstore\/detail\/lighthouse\/blipmdconlkpinefehnmjammfjpmpbjk\">Chrome<\/a> and<br \/>\n<a rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\/\/addons.mozilla.org\/en-US\/firefox\/addon\/google-lighthouse\/\">Firefox<\/a>). It powers many Google<br \/>\nservices, including web.dev\/measure and <a rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\/\/developers.google.com\/speed\/pagespeed\/insights\/\">PageSpeed<br \/>\nInsights<\/a>.<\/p>\n<p>Lighthouse 6.0 is available immediately on npm and in <a rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\/\/www.google.com\/chrome\/canary\/\">Chrome<br \/>\nCanary<\/a>. Other Google services that leverage Lighthouse will<br \/>\nget the update by the end of the month. It will land in Chrome Stable in Chrome 84 (mid-July).<\/p>\n<p>To try the Lighthouse Node CLI, use the following commands:<\/p>\n<p><web-copy-code><\/p>\n<pre class=\"language-bash\"><code class=\"language-bash\"><span class=\"token function\">npm<\/span> <span class=\"token function\">install<\/span> -g lighthouse<br>lighthouse https:\/\/www.example.com --view<\/code><\/pre>\n<p><\/web-copy-code><\/p>\n<p>This version of Lighthouse comes with a large number of changes that are<br \/>\n<a rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\/\/github.com\/GoogleChrome\/lighthouse\/releases\/tag\/v6.0.0\">listed in the 6.0 changelog<\/a>. We&#039;ll cover<br \/>\nthe highlights in this article.<\/p>\n<h2 id=\"new-metrics\"><span class=\"ez-toc-section\" id=\"New-metrics\"><\/span>New metrics <span class=\"ez-toc-section-end\"><\/span><\/h2>\n<figure class=\"w-figure\">\n  <img alt='lighthouse-new-metrics-2369866' class=\"w-screenshot\" src='https:\/\/rmarketingdigital.com\/wp-content\/uploads\/2020\/10\/lighthouse-new-metrics-2369866.png' width=\"600\"><br \/>\n<\/figure>\n<p>Lighthouse 6.0 introduces three new metrics to the report. Two of these new metrics \u2013 Largest<br \/>\nContentful Paint (LCP) and Cumulative Layout Shift (CLS) \u2013are lab implementations of Core Web<br \/>\nVitals.<\/p>\n<h3 id=\"lcp\"><span class=\"ez-toc-section\" id=\"Largest-Contentful-Paint-LCP\"><\/span>Largest Contentful Paint (LCP) <span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Largest Contentful Paint (LCP) is a measurement of perceived loading<br \/>\nexperience. It marks the point during page load when the primary \u2013 or \u00ablargest\u00bb \u2013content has loaded and<br \/>\nis visible to the user. LCP is an important complement to First Contentful Paint (FCP) which only<br \/>\ncaptures the very beginning of the loading experience. LCP provides a signal to developers about how<br \/>\nquickly a user is actually able to see the content of a page. An LCP score below 2.5 seconds is<br \/>\nconsidered &#039;Good.&#039;<\/p>\n<p>For more information, <a rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\/\/youtu.be\/diAc65p15ag\">watch this deep-dive on LCP<\/a> by Paul Irish.<\/p>\n<h3 id=\"cls\"><span class=\"ez-toc-section\" id=\"Cumulative-Layout-Shift-CLS\"><\/span>Cumulative Layout Shift (CLS) <span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Cumulative Layout Shift (CLS) is a measurement of visual stability. Item<br \/>\nquantifies how much a page&#039;s content visually shifts around. A low CLS score is a signal to<br \/>\ndevelopers that their users aren&#039;t experiencing undue content shifts; a CLS score below 0.10 is<br \/>\nconsidered &#039;Good.&#039;<\/p>\n<p>CLS in a lab environment is measured through the end of page load. Whereas in the field, you can<br \/>\nmeasure CLS up to the first user interaction or including all user input.<\/p>\n<p>For more information, <a rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\/\/youtu.be\/zIJuY-JCjqw\">watch this deep-dive on CLS<\/a> by Annie Sullivan.<\/p>\n<h3 id=\"tbt\"><span class=\"ez-toc-section\" id=\"Total-Blocking-Time-TBT\"><\/span>Total Blocking Time (TBT) <span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Total Blocking Time (TBT) quantifies load responsiveness, measuring the<br \/>\ntotal amount of time when the main thread was blocked long enough to prevent input responsiveness.<br \/>\nTBT measures the total amount of time between First Contentful Paint (FCP) and Time to Interactive<br \/>\n(TTI). It is a companion metric to TTI and it brings more nuance to quantifying main thread activity<br \/>\nthat blocks a user&#039;s ability to interact with your page.<\/p>\n<p>Additionally, TBT correlates well with the field metric First Input Delay<br \/>\n(FID), which is a Core Web Vital.<\/p>\n<h2 id=\"score\"><span class=\"ez-toc-section\" id=\"Performance-score-update\"><\/span>Performance score update  <span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The performance score in Lighthouse is calculated from a<br \/>\nweighted blend of multiple metrics to summarize a page&#039;s speed. The 6.0 performance score formula<br \/>\nfollows.<\/p>\n<table class=\"lh-table\">\n<thead>\n<tr>\n<th><strong>Phase<\/strong><\/th>\n<th><strong>Metric Name<\/strong><\/th>\n<th><strong>Metric Weight<\/strong><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Early (15%)<\/td>\n<td>First Contentful Paint (FCP)<\/td>\n<td>15%<\/td>\n<\/tr>\n<tr>\n<td>Mid (40%)<\/td>\n<td>Speed Index (SI)<\/td>\n<td>15%<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td>Largest Contentful Paint (LCP)<\/td>\n<td>25%<\/td>\n<\/tr>\n<tr>\n<td>Late (15%)<\/td>\n<td>Time To Interactive (TTI)<\/td>\n<td>15%<\/td>\n<\/tr>\n<tr>\n<td>Main Thread (25%)<\/td>\n<td>Total Blocking Time (TBT)<\/td>\n<td>25%<\/td>\n<\/tr>\n<tr>\n<td>Predictability (5%)<\/td>\n<td>Cumulative Layout Shift (CLS)<\/td>\n<td>5%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>While three new metrics have been added, three old ones have been removed: First Meaningful Paint,<br \/>\nFirst CPU Idle, and Max Potential FID. The weights of remaining metrics have been modified to<br \/>\nemphasize main thread interactivity and layout predictability.<\/p>\n<p>For comparison, here is version 5 scoring:<\/p>\n<table class=\"lh-table\">\n<thead>\n<tr>\n<th><strong>Phase<\/strong><\/th>\n<th><strong>Metric Name<\/strong><\/th>\n<th><strong>Weight<\/strong><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Early (23%)<\/td>\n<td>First Contentful Paint (FCP)<\/td>\n<td>23%<\/td>\n<\/tr>\n<tr>\n<td>Mid (34%)<\/td>\n<td>Speed Index (SI)<\/td>\n<td>27%<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td>First Meaningful Paint (FMP)<\/td>\n<td>7%<\/td>\n<\/tr>\n<tr>\n<td>Finished (46%)<\/td>\n<td>Time to Interactive (TTI)<\/td>\n<td>33%<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td>First CPU Idle (FCI)<\/td>\n<td>13%<\/td>\n<\/tr>\n<tr>\n<td>Main Thread<\/td>\n<td>Max Potential FID<\/td>\n<td>0%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><img alt='lighthouse-weight-changes-2177453' src='https:\/\/rmarketingdigital.com\/wp-content\/uploads\/2020\/10\/lighthouse-weight-changes-2177453.png'><\/p>\n<p>Some highlights of scoring changes between Lighthouse versions 5 and 6:<\/p>\n<ul>\n<li><strong>TTI&#039;s weight has been reduced from 33% to 15%<\/strong>. This was in direct response to user<br \/>\nfeedback about TTI variability, as well as inconsistencies in metric optimizations leading to<br \/>\nimprovements in user experience. TTI is still a useful signal for when a page is fully<br \/>\ninteractive, however with TBT as a<br \/>\ncomplement\u2013<a rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\/\/docs.google.com\/document\/d\/1xCERB_X7PiP5RAZDwyIkODnIXoBk-Oo7Mi9266aEdGg\/edit#heading=h.vkfjuiyx1s5l\">variability is reduced<\/a>.<br \/>\nWith this scoring change, we hope developers are more effectively encouraged to optimize for<br \/>\nuser interactivity.<\/li>\n<li><strong>FCP&#039;s weight has been reduced from 23% to 15%.<\/strong> Measuring only when the first pixel is<br \/>\npainted (FCP) didn&#039;t give us a complete picture. Combining it with measuring when users are able<br \/>\nto see what they most likely care about (LCP) better reflects the loading experience.<\/li>\n<li><strong>Max Potential FID<\/strong> <strong>has been deprecated<\/strong>. It is no longer shown in the report, but is<br \/>\nstill available in the JSON. It is now recommended to look at TBT to quantify your interactivity<br \/>\ninstead of mpFID.<\/li>\n<li><strong>First Meaningful Paint has been deprecated.<\/strong> This metric was too variant and had not viable<br \/>\npath to standardization as the implementation is specific to Chrome rendering internals. While<br \/>\nsome teams do find the FMP timing to be worthwhile on their site, the metric will not receive<br \/>\nadditional improvements.<\/li>\n<li><strong>First CPU Idle has been deprecated<\/strong> because it&#039;s not distinct enough from TTI. TBT and TTI<br \/>\nare the go-to metrics for interactivity now.<\/li>\n<li>CLS&#039;s weight is relatively low, though we expect to increase it in a future major version.<\/li>\n<\/ul>\n<h3 id=\"score-shifts\"><span class=\"ez-toc-section\" id=\"Shifts-in-scores\"><\/span>Shifts in scores <span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>How do these changes affect the scores of real sites? We have published an<br \/>\n<a rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\/\/docs.google.com\/spreadsheets\/d\/1BZFh7AyyaLHCj5LGAbrn3m72ysu4yv8okyHG-f3MoXI\/edit?usp=sharing\">analysis<\/a><br \/>\nof the score changes using two datasets: a <a rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\/\/gist.github.com\/connorjclark\/8afe673d4e7c6e17204834a256e7caf1\">general set of<br \/>\nsites<\/a> and a<br \/>\n<a rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\/\/gist.github.com\/connorjclark\/0be52464887ae3a6f29ad5a798122e0c#file-readme-md\">set of static sites<\/a><br \/>\nbuilt with <a rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\/\/www.11ty.dev\/\">Eleventy<\/a>. In summary, ~ 20% of sites see noticeably higher<br \/>\nscores, ~ 30% have hardly any change, and ~ 50% see a decrease of at least five points.<\/p>\n<p>The score changes can be broken down into three primary components:<\/p>\n<ul>\n<li>score weight changes<\/li>\n<li>bug fixes to underlying metric implementations<\/li>\n<li>individual score curve changes<\/li>\n<\/ul>\n<p>Score weight changes and the introduction of three new metrics drove a majority of overall score<br \/>\nchanges. New metrics that developers have yet to optimize for carry significant weight in the version 6<br \/>\nperformance score. While the average performance score of the test corpus in version 5 was around 50, the average scores on the new Total Blocking Time and Largest Contentful Paint metrics were around 30. Together those two metrics account for 50% of the weight in the Lighthouse version 6 performance score, so naturally a large percentage of sites saw decreases.<\/p>\n<p>Bug fixes to the underlying metric computation can result in different scores. This affects<br \/>\nrelatively few sites but can have sizable impact in certain situations. Overall, about 8% of sites<br \/>\nexperienced a score improvement due to metric implementation changes and about 4% of sites saw a score<br \/>\ndecrease due to metric implementation changes. Approximately 88% of sites were unaffected by these fixes.<\/p>\n<p>Individual score curve changes also impacted the overall score shifts although very slightly. We<br \/>\nperiodically ensure that the score curve aligns with the observed metrics in the <a rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"http:\/\/httparchive.org\/\">HTTPArchive<br \/>\ndataset<\/a>. Excluding sites affected by major implementation changes, minor<br \/>\nadjustments to the score curve for individual metrics improved the scores of about 3% of sites and<br \/>\ndecreased the scores of about 4% of sites. Approximately 93% of sites were unaffected by this change.<\/p>\n<h3 id=\"calculator\"><span class=\"ez-toc-section\" id=\"Scoring-calculator\"><\/span>Scoring calculator <span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>We&#039;ve published a <a rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\/\/googlechrome.github.io\/lighthouse\/scorecalc\/\">scoring calculator<\/a> to help<br \/>\nyou explore performance scoring. The calculator also gives you a comparison between Lighthouse version 5 and<br \/>\n6 scores. When you run an audit with Lighthouse 6.0, the report comes with a link to the calculator<br \/>\nwith your results populated.<\/p>\n<figure class=\"w-figure\">\n  <img alt='lighthouse-scorecalc-1889936' class=\"w-screenshot\" src='https:\/\/rmarketingdigital.com\/wp-content\/uploads\/2020\/10\/lighthouse-scorecalc-1889936.png' width=\"600\"><figcaption class=\"w-figcaption\">Huge thanks to <a rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\/\/twitter.com\/anatudor\">Ana Tudor<\/a> for the gauge upgrade!<\/figcaption><\/figure>\n<h2 id=\"new-audits\"><span class=\"ez-toc-section\" id=\"New-audits\"><\/span>New audits <span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 id=\"unused-javascript\"><span class=\"ez-toc-section\" id=\"Unused-JavaScript\"><\/span>Unused JavaScript <span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>We are leveraging <a rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\/\/developers.google.com\/web\/tools\/chrome-devtools\/coverage\">DevTools code<br \/>\ncoverage<\/a> in a new audit: <strong>Unused<br \/>\nJavaScript<\/strong>.<\/p>\n<p>This audit isn&#039;t <em>entirely<\/em> new: it was <a rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\/\/github.com\/GoogleChrome\/lighthouse\/issues\/1852#issuecomment-306900595\">added in<br \/>\nmid-2017<\/a>, but<br \/>\nbecause of the performance overhead it was disabled by default to keep the Lighthouse as fast as<br \/>\npossible. Collecting this coverage data is far more efficient now, so we feel comfortable enabling<br \/>\nit by default.<\/p>\n<h3 id=\"a11y\"><span class=\"ez-toc-section\" id=\"Accessibility-audits\"><\/span>Accessibility audits <span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Lighthouse uses the wonderful <a rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\/\/github.com\/dequelabs\/axe-core\">ax-core<\/a> library to power the<br \/>\naccessibility category. In Lighthouse 6.0, we&#039;ve added the following audits:<\/p>\n<h3 id=\"maskable-icon\"><span class=\"ez-toc-section\" id=\"Maskable-icon\"><\/span>Maskable icon <span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Maskable icons is a new icon format that makes icons for your PWA<br \/>\nlook great across all types of devices. To help your PWA look as good as possible, we&#039;ve introduced<br \/>\na new audit to check if your manifest.json supports this new format.<\/p>\n<h3 id=\"charset\"><span class=\"ez-toc-section\" id=\"Charset-declaration\"><\/span>Charset declaration <span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The meta charset element declares what character encoding should be used<br \/>\nto interpret an HTML document. If this element is missing, or if it is declared late in the<br \/>\ndocument, browsers employ a number of heuristics to guess which encoding should be used. If a<br \/>\nbrowser guesses incorrectly, and a late meta charset element is found, the parser generally throws<br \/>\nout all the work done so far and starts over, leading to poor experiences for the user. This new<br \/>\naudit verifies the page has a valid character encoding and it&#039;s defined early and up front.<\/p>\n<h2 id=\"ci\"><span class=\"ez-toc-section\" id=\"Lighthouse-CI\"><\/span>Lighthouse CI <span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>At CDS last November<br \/>\nwe announced <a rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\/\/github.com\/GoogleChrome\/lighthouse-ci\">Lighthouse CI<\/a>, the open source Node<br \/>\nCLI and server that tracks Lighthouse results on every commit in your continuous integration<br \/>\npipeline, and we&#039;ve come a long way since the alpha release. Lighthouse CI now has support<br \/>\nfor numerous CI providers including Travis, Circle, GitLab, and Github Actions. Ready-to-deploy<br \/>\n<a rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\/\/github.com\/GoogleChrome\/lighthouse-ci\/tree\/master\/docs\/recipes\">docker images<\/a> make setup a<br \/>\nbreeze, and a comprehensive dashboard redesign now reveals trends across every category and metric<br \/>\nin Lighthouse for detailed analysis.<\/p>\n<p>Start using Lighthouse CI on your project today by following our<br \/>\n<a rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\/\/github.com\/GoogleChrome\/lighthouse-ci\/blob\/master\/docs\/getting-started.md\">getting started guide<\/a>.<\/p>\n<figure class=\"w-figure w-figure--inline-left\">\n<p>    <img alt='lighthouse-ci-1-2123731' class=\"w-screenshot\" src='https:\/\/rmarketingdigital.com\/wp-content\/uploads\/2020\/10\/lighthouse-ci-1-2123731.png' width=\"600\"><\/p>\n<\/figure>\n<figure class=\"w-figure w-figure--inline-left\">\n<p>    <img alt='lighthouse-ci-2-4937296' class=\"w-screenshot\" src='https:\/\/rmarketingdigital.com\/wp-content\/uploads\/2020\/10\/lighthouse-ci-2-4937296.png' width=\"600\"><\/p>\n<\/figure>\n<figure class=\"w-figure\">\n<p>    <img alt='lighthouse-ci-3-3713028' class=\"w-screenshot\" src='https:\/\/rmarketingdigital.com\/wp-content\/uploads\/2020\/10\/lighthouse-ci-3-3713028.png' width=\"600\"><\/p>\n<\/figure>\n<p>We&#039;ve renamed the <strong>Audits<\/strong> panel to the <strong>Lighthouse<\/strong> panel. Enough said!<\/p>\n<p>Depending on your DevTools window size, the panel is probably behind the <code>\u00bb<\/code> button. You can drag<br \/>\nthe tab to change the order.<\/p>\n<p>To quickly reveal the panel with the <a rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\/\/developers.google.com\/web\/tools\/chrome-devtools\/command-menu\">Command<br \/>\nmenu<\/a>:<\/p>\n<ol>\n<li>Press <code>Control + Shift + J<\/code> (or <code>Command + Option + J<\/code> on Mac) to open DevTools.<\/li>\n<li>Press <code>Control + Shift + P<\/code> (or <code>Command + Shift + P<\/code> on Mac) to<br \/>\nOpen the <strong>Command<\/strong> menu.<\/li>\n<li>Start typing \u00abLighthouse\u00bb.<\/li>\n<li>Press <code>Enter<\/code>.<\/li>\n<\/ol>\n<h2 id=\"emulation\"><span class=\"ez-toc-section\" id=\"Mobile-emulation\"><\/span>Mobile emulation <span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Lighthouse follows a mobile-first mindset. Performance problems are more apparent under typical<br \/>\nmobile conditions, but developers often don&#039;t test in these conditions. This is why the default<br \/>\nconfiguration in Lighthouse applies mobile emulation. The emulation consists of:<\/p>\n<ul>\n<li>Simulated slow network and CPU conditions (via a simulation engine called<br \/>\n<a rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\/\/github.com\/GoogleChrome\/lighthouse\/blob\/master\/docs\/lantern.md\">Lantern<\/a>).<\/li>\n<li>Device screen emulation (the same found in Chrome DevTools).<\/li>\n<\/ul>\n<p>Since the beginning, Lighthouse has used Nexus 5X as its reference device. In recent years, most<br \/>\nperformance engineers have been using Moto G4 for testing purposes. Now Lighthouse is following suit<br \/>\nand has changed its reference device to Moto G4. In practice, this change is not very noticeable,<br \/>\nbut here are all the changes detectable by a webpage:<\/p>\n<ul>\n<li>Screen size is changed from 412 \u00d7 660 px to 360 \u00d7 640 px.<\/li>\n<li>The user agent string is changed slightly, the device portion that was previously <code>Nexus 5 Build \/ MRA58N<\/code><br \/>\nwill now be <code>Moto G (4)<\/code>.<\/li>\n<\/ul>\n<p>As of Chrome 81, Moto G4 is also available in the Chrome DevTools device emulation list.<\/p>\n<figure class=\"w-figure\">\n  <img alt='lighthouse-motog4-3361904' class=\"w-screenshot w-screenshot--filled\" src='https:\/\/rmarketingdigital.com\/wp-content\/uploads\/2020\/10\/lighthouse-motog4-3361904.png'><br \/>\n<\/figure>\n<h2 id=\"extension\"><span class=\"ez-toc-section\" id=\"Browser-extension\"><\/span>Browser extension <span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The<br \/>\n<a rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\/\/chrome.google.com\/webstore\/detail\/lighthouse\/blipmdconlkpinefehnmjammfjpmpbjk\">Chrome extension for Lighthouse<\/a><br \/>\nhas been a convenient way to run Lighthouse locally. Unfortunately, it was complicated to support.<br \/>\nWe felt that because the Chrome DevTools <strong>Lighthouse<\/strong> panel is a better experience (the report<br \/>\nintegrates with other panels), we could reduce our engineering overhead by simplifying the Chrome<br \/>\nextension.<\/p>\n<p>Instead of running Lighthouse locally, the extension now uses the <a rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\/\/developers.google.com\/speed\/docs\/insights\/v5\/get-started\">PageSpeed Insights<br \/>\nAPI<\/a>. We recognize that this will<br \/>\nnot be a sufficient replacement for some of our users. These are the key differences:<\/p>\n<ul>\n<li>PageSpeed Insights is unable to audit non-public websites, since it is run via a remote<br \/>\nserver and not your local Chrome instance. If you need to audit a non-public website, use<br \/>\nthe DevTools <strong>Lighthouse<\/strong> panel, or the Node CLI.<\/li>\n<li>PageSpeed Insights is not guaranteed to use the latest Lighthouse release. If you want to use<br \/>\nthe latest release, use the Node CLI. The browser extension will get the update ~ 1-2 weeks after release.<\/li>\n<li>PageSpeed Insights is a Google API, using it constitutes accepting the Google API Terms of<br \/>\nService. If you do not wish to or cannot accept the terms of service, use the DevTools <strong>Lighthouse<\/strong> panel,<br \/>\nor the Node CLI.<\/li>\n<\/ul>\n<p>The good news is that simplifying the product story allowed us to focus on other engineering<br \/>\nproblems. As a result, we released the <a rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\/\/addons.mozilla.org\/en-US\/firefox\/addon\/google-lighthouse\/\">Lighthouse Firefox<br \/>\nextension<\/a>!<\/p>\n<h2 id=\"budgets\"><span class=\"ez-toc-section\" id=\"Budgets\"><\/span>Budgets <span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Lighthouse 5.0 introduced performance budgets which<br \/>\nsupported adding thresholds for<br \/>\n<a rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\/\/github.com\/GoogleChrome\/lighthouse\/blob\/master\/docs\/performance-budgets.md#resource-budgets\">how much of each resource type<\/a><br \/>\n(such as scripts, images, or css) a page can serve.<\/p>\n<p>Lighthouse 6.0 adds<br \/>\n<a rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\/\/github.com\/GoogleChrome\/lighthouse\/blob\/master\/docs\/performance-budgets.md#timing-budgets\">support for budgeting metrics<\/a>,<br \/>\nso now you can set thresholds for specific metrics such as FCP. For now, budgets are only available<br \/>\nto the Node CLI and Lighthouse CI.<\/p>\n<h2 id=\"source-location\"><span class=\"ez-toc-section\" id=\"Source-location-links\"><\/span>Source location links <span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Some of the issues that Lighthouse finds about a page can be traced back to a specific line of<br \/>\nsource code and the report will state the exact file and line that&#039;s relevant. To make this easy to<br \/>\nexplore in DevTools, clicking on the locations specified in the report will open the relevant files<br \/>\nin the <strong>Sources<\/strong> panel.<\/p>\n<figure class=\"w-figure\">\n  <video autoplay=\"\" loop=\"\" muted=\"\" playsinline=\"\" class=\"w-screenshot\"><source src=\"https:\/\/storage.googleapis.com\/web-dev-assets\/lighthouse-whats-new-6.0\/lighthouse-source-location.webm\" type=\"video\/webm\"><source src=\"https:\/\/storage.googleapis.com\/web-dev-assets\/lighthouse-whats-new-6.0\/lighthouse-source-location.mp4\" type=\"video\/mp4\"><\/source><\/source><\/video><figcaption class=\"w-caption\">\n    DevTools reveals the exact line of code that causes the issue.<br \/>\n  <\/figcaption><\/figure>\n<h2 id=\"horizon\"><span class=\"ez-toc-section\" id=\"On-the-horizon\"><\/span>On the horizon <span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Lighthouse has begun experimenting with collecting source maps to power new features, such as:<\/p>\n<ul>\n<li>Detecting duplicate modules in JavaScript bundles.<\/li>\n<li>Detecting excessive polyfills or transforms in code sent to modern browsers.<\/li>\n<li>Augmenting the Unused JavaScript audit to provide module-level granularity.<\/li>\n<li>Treemap visualizations highlighting the modules that require action.<\/li>\n<li>Displaying the original source code for report items with a &quot;source location&quot;.<\/li>\n<\/ul>\n<figure class=\"w-figure\">\n  <img alt='lighthouse-sourcemaps-unusedjs-8218644' class=\"w-screenshot\" src='https:\/\/rmarketingdigital.com\/wp-content\/uploads\/2020\/10\/lighthouse-sourcemaps-unusedjs-8218644.png' width=\"600\"><figcaption class=\"w-caption\">\n    The Unused JavaScript audit using source maps to show unused code in specific bundled modules.<br \/>\n  <\/figcaption><\/figure>\n<p>These features will be enabled by default in a future version of Lighthouse. For now, you can view<br \/>\nLighthouse&#039;s experimental audits with the following CLI flag:<\/p>\n<p><web-copy-code><\/p>\n<pre class=\"language-bash\"><code class=\"language-bash\">lighthouse https:\/\/web.dev --view --preset experimental<\/code><\/pre>\n<p><\/web-copy-code><\/p>\n<h2 id=\"thanks\"><span class=\"ez-toc-section\" id=\"Thank-you\"><\/span>Thank you! <span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>We thank you for using Lighthouse and providing feedback. Your feedback helps us improve Lighthouse<br \/>\nand we hope Lighthouse 6.0 will make it easier for you to improve the performance of your<br \/>\nwebsites.<\/p>\n<p>What can you do next?<\/p>\n<ul>\n<li>Open Chrome Canary and give the <strong>Lighthouse<\/strong> panel to go.<\/li>\n<li>Use the Node CLI: <code>npm install -g lighthouse &amp;&amp; lighthouse https:\/\/yoursite.com --view<\/code>.<\/li>\n<li>Get <a rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\/\/github.com\/GoogleChrome\/lighthouse-ci#lighthouse-ci\">Lighthouse CI<\/a> running with<br \/>\nyour project.<\/li>\n<li>Review the Lighthouse audit documentation.<\/li>\n<li>Have fun making the web better!<\/li>\n<\/ul>\n<p>We&#039;re passionate about the web and we love working with the developer community to build tooling to<br \/>\nhelp improve the web. Lighthouse is an open source project and we extend a huge thanks to all the<br \/>\ncontributors helping out with everything from typo fixes to documentation refactors to brand new<br \/>\naudits.<br \/>\n<a rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\/\/github.com\/GoogleChrome\/lighthouse\/blob\/master\/CONTRIBUTING.md\">Interested in contributing?<\/a><br \/>\nSwing by the <a rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\/\/github.com\/GoogleChrome\/lighthouse\">Lighthouse GitHub repo<\/a>.<\/p>\n<p>    <web-feedback additional-questions=\"\"><\/web-feedback>\n  <\/div>\n<p><script async src=\"\/\/platform.twitter.com\/widgets.js\" charset=\"utf-8\"><\/script><\/p>","protected":false},"excerpt":{"rendered":"<p>New metrics, Performance score update, new audits, and more. May 19, 2020 Today we&#8217;re releasing Lighthouse 6.0! Lighthouse is an automated website auditing tool that helps developers with opportunities and&#8230;<\/p>","protected":false},"author":1,"featured_media":92985,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1356],"tags":[1434,1418],"class_list":["post-92984","post","type-post","status-publish","format-standard","has-post-thumbnail","category-dev","tag-chrome","tag-mac"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.0 (Yoast SEO v28.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>What&#039;s New in Lighthouse 6.0 - R Marketing Digital<\/title>\n<meta name=\"description\" content=\"New metrics, Performance score update, new audits, and more. May 19, 2020 Today we&#039;re releasing Lighthouse 6.0! 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