Addy Osmani

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Tip: Chrome can measure how much unused JavaScript is on your page bit.ly/unused-js. Helpful to identify code to remove or lazy-load. DevTools > three-right menu > More tools > Coverage
Speed up page loads with Early Hints in Chrome 103! bit.ly/chrome-eh ⚡️ Send hints about critical resources/origins in advance, while the server generates HTML. More on our experiments w/@Cloudflare & @Shopify improving LCP bit.ly/cloudflare-eh bit.ly/shpfy-eh
Today, HTTP 103 Early Hints ships with Chrome 103! Why is this important for #webperf? How did @Shopify help make all merchant sites faster? (LCP over 500ms faster at p50!) 🧵 Hint: A little collaboration w/@Cloudflaree &@googlechromeep
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Software Engineering - The Soft Parts: bit.ly/eng-softparts ~ my advice for engineers, reflecting on 10 years of learnings in @googlechrome.
😍@ChromeDevToolss now supports more of the Console Standard for formatting logs. This includes %i (integer), %f (float), %s (string) for type conversions. I like %o for nice formatting:console.spec.whatwg.orgf4
Woo-hoo, new options to replay slowwwwly in the @ChromeDevTools Recorder! 🐢🐌🦥 Pick the speed you need and observe the changes on screen - slow 🐢, very slow 🐌 and extremely slow 🦥. Wait... which animal is slower actually? 😆 Go try it in Chrome CanarypPFYDa
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A fantastic 5-part series on trying to build a fast site (and mistakes along the way): bit.ly/fastest-site by @tigt_. Streaming, SPAs, trade-offs & more covered.
Container Queries is shipping in Safari 16! Both size queries and container query units. Learn more about the details at webkit.org/blog/12824/new…
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What the new Shared Element Transitions API proposal enables is 😍. Learn more from@jaffathecakee's great talk:bit.ly/set-yt1, a guide:bit.ly/set-g4 or codelab with@nextjss:bit.ly/set-nextgW
Tired of having to wait for bundlers to update the page when adding console.logs? Chrome has your back! You can dynamically insert console.logs without touching your code. Just right-click on the line and choose "logpoint", enter the variables you want to log and hit Enter 🤯Q
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A good mini WebPerf case-study. My favorite part: use React 18 + wrap UI in <Suspense> to make hydration non-blocking (done in slices). This improved Total Blocking Time (⏱ page is blocked from responding to input) twitter.com/dan_abramov/st…
There have been a LOT of recent developments in the world of web performance and Core Web Vitals that are being showcased at Google I/O this week. Here's a rundown of the highlights, so you don't miss anything 👇
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Prerendering can make next-page navigations faster. Chrome on Android will soon prerender high-confidence URLs developers defined via the Speculation Rules API. One site improved LCP by 2.7x and at P95 by 1.6s! bit.ly/spec-prerender
I've been dying to share this for weeks now… Introducing the page transition API! It's still in-development, but you can play with it today. I'm really happy with where this API is heading. I hope you like it too! youtube.com/watch?v=JCJUPJ…
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Intent to ship Container Queries in Chrome! bit.ly/i2s-cq. Style elements based on the size of a container vs. just the viewport. In-development in Firefox & Safari.
Measuring Web Vitals? We just added Time To First Byte (server latency) and Interaction To Next Paint (responsiveness) to the free @ChromeUXReport API. Demo comparing sites: crux.zaps.dev Learn more: bit.ly/crx-api-m3 && bit.ly/crx-api
The "Software Engineering at Google" book is now free to read online: bit.ly/swe-book. Great insights on improving code quality & scaling engineering teams.
Want find-in-page to work with collapsed content in HTML? 🔎bit.ly/hiddenuntilS The new hidden=until-found attribute & beforematch auto-opens sections on find. In Chromium 102 thx to@JosephArharr!c
✨ Woo-hoo! You can now export, convert and replay user flows with Cypress! 📹 Try out the new@Cypress_ioo Chrome Recorder library 👉goo.gle/cypress-chrome…04Ze
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Starting in 10 minutes, can't wait to see you there! We've got amazing talks today from @devdevcharlie, @addyosmani, @BenLesh, @bencodezen, @N_Tepluhina, @mourner, @dan_abramov, and @ThePunderWoman, and more tomorrow! devsforukraine.io
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Happy to share Chrome and @angular are collaborating to improve their Core Web Vitals. Projects include a new Image optimization component 📸 & exploring improvements to SSR & hydration 👆angular.io/guide/roadmap2A &bit.ly/ng-performanceJzI
This week on the podcast, check out @lydiahallie and @addyosmani teaching us all about Patterns on the JavaScript powered open web! hanselminutes.com/837/patternsde…
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⚡️ priority hints have been in development for a few years, but now they’re coming to a browser near you! i wrote about how they can help prioritise assets, when they’re useful and how you can start experimenting (ht @patmeenan for review). 👇🏻#webperfrf calibreapp.com/blog/priority-…9b
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"What is Cumulative Layout Shift (CLS) and why does it matter?" This is probably my favorite example. twitter.com/detroit_bound/…
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Excited for Early Hints: speed up page loads by preloading resources from <link rel=preload> headers before a final response is received. +1s faster LCP in my @Cloudflare and @Shopify lab tests: bit.ly/early-hints
The life of a project
I'm speaking at devsforukraine.io on April 25-26 with lots of other great speakers. All money raised will help orgs in Ukraine that could use your help 🇺🇦. $17,000 raised so far. Any and all donations appreciated.
We've put together a small conference to benefit Ukraine on April 25-26! There are 17 amazing speakers joining in, and all of the money donates goes directly to benefit orgs that could use your help. Register, learn more, and donate here! devsforukraine.io
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HTML <canvas> & Web Audio are great for music visualizers 🎵. Here's one for a track from my upcoming album:viper.zaps.devV (flashes). Good starter guides:bit.ly/apvizWmzl.la/3LB93CL5j
I'm starting a new series of articles on @TheLeadDev about engineering management & leadership. First post: setting a vision, mission & strategy: bit.ly/visionmstr
🧵As I mentioned last weekGOV.UKj removed jQuery as a dependency for all frontend apps, meaning 32 KB of minified & compressed JS was removed. So let's see what difference this has made for users by examining our RUM data. Thread will mainly focus on JS CPU time.
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The <img> element now supports lazy-loading, async decoding, Priority Hints and more. I wrote about some of them for the @StackOverflow blog: bit.ly/soimgs. Helpful if optimizing UX & performance.
In case you weren't aware; Chromium browsers (Chrome, Edge), Firefox, and Safari now all support native image lazy loading. <img loading="lazy"/> No need for custom polyfills for major browsers anymore! caniuse.com/loading-lazy-a…
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Best practices for writing code-comments by @ellenspertus: bit.ly/codecmts. Often, comments should only answer questions code can't (e.g. the "why")
Debugging CORS errors is less painful now with @ChromeDevTools! Click on the new icon to identify the relevant network request, or use the Issues tab to find and get suggestions to fix them all.
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A good list of skills senior engineers need, beyond coding by @skamille: bit.ly/srenglist
Want to optimize your JavaScript bundles? Try the Lighthouse Treemap in @ChromeDevTools & PageSpeed to find & replace large dependencies. Great for visualizing what's in the JS you ship: bit.ly/lh-tree
`accent-color` is now supported in all modern browsers 🎉🎨 One line of code enables you to style previously-hard-to-access form controls like checkboxes and radio buttons body { accent-color: hotpink; } Works really nicely with the `color-scheme` property too2G
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Working on a short book about Developer Experience.
Native <img> lazy-loading is now shipping to Safari 15.4! webkit.org/blog/12445/new… 🎉 for stronger cross-browser support.twitter.com/addyosmani/sta…w
Rendering on the web is a spectrum. Static HTML? SSR? Streaming? Here we cover options & trade-offs: bit.ly/renderingp & bit.ly/rendering-web
33 years ago today, I submitted a proposal for a system called the World Wide Web. I'd normally publish thoughts on the state of the web. But these are not normal times. Instead, @rosemaryleith & I ask you to join us to #StandWithUkraine however you can. webfoundation.org/2022/03/standi… twitter.com/rosemaryleith/…
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It's happening! Priority hints is shipping to stable in Chrome 101 (and likely other Chromium-based browsers). Note that the HTML attribute is now "fetchpriority", so go tag those LCP images with fetchpriority=high for a quick, significant win (usually) web.dev/priority-hints/
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WordPress powers 40% of the web. Our team at Google is collaborating on improving its web performance via a new Performance team & Lab plugin. Excited for this from @TweetyThierry, @felixarntz & many more. bit.ly/wpp-lab && bit.ly/wpp-team
With our latest version of @googlechrome, we substantially increased its speed across all major platforms, including Chrome on Mac which was given the highest score to date for any browser (300) on Apple's Speedometer. blog.chromium.org/2022/03/a-new-…
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The CSS Overview in @ChromeDevTools is great. Nice summary of the colors, contrast issues, fonts, media queries & more in a page.
There's a great new blog post on web.dev from @hdjirdeh and @leena_sohoni about how to optimize script loading if you're using Next.js -- highly recommend a read! Check it out here: web.dev/script-compone…
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Just landed in Chrome Canary. You can now import & export recording as a JSON file in @ChromeDevTools. A game changer for bug reporting maybe? That's exactly what I did. 👀 Fill a bug to my teammate with the JSON while looking for flat in Munich lol. �crbug.com/1302555PV7
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Interop 2022: major browser vendors Apple, Google, Microsoft and Mozilla, plus Igalia and Bocoup, have come together to solve the top browsers compatibility issues identified by web developers. Read more: bit.ly/3HFDCog
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HOW TO HELP UKRAINE 🇺🇦 Thread of donation links and organizations I kindly ask everyone to retweet this thread so that more people in & outside of Ukraine see it.
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