Mathias Bynens @mathias
♥ JavaScript, HTML, CSS, HTTP, performance, security, Bash, Unicode, i18n. mths.be https://mastodon.xyz/@mathias Joined January 2007-
Tweets23K
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Followers65K
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Following1K
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@matanbobi @github @Microsoft Thank you so much, Matan!
That’s a first: GitHub’s Advisory Database (incorrectly) flags Puppeteer as malware. github.com/github/advisor… We are no longer able to publish new releases. Anyone at @github or @Microsoft who can escalate this, please?
@arash_sheyda @github @Microsoft Thank you so much!
@Cloudflare isitagentready.com/.well-known/ag… has an encoding issue (see the text following “Cloudflare zones”). Instead of `content-type: text/markdown`, consider serving as `content-type: text/markdown;charset=utf-8` and updating the skill accordingly.
@sarah_edo Congratulations Sarah. Such great news for Chrome!
@addyosmani @markgoho Closing the loop: we shipped this last week!
@addyosmani @alperortac Currently chrome-devtools-mcp supports global network throttling, but not on a per-request basis (yet). To help us prioritize per-request throttling support in chrome-devtools-mcp, please file a feature request with a motivating use case here: github.com/ChromeDevTools…
@elsigh @addyosmani @ChromeDevTools It's part of the config. The readme has an example: github.com/ChromeDevTools…
Announcing @ChromeDevTools MCP! 🚀 Connect your AI coding agent to Chrome's powerful automation & debugging capabilities with ease. Key features: ✅ Reliable automation: It can programmatically handle clicks, form fills, dialogs, and page navigation with ease. ✅ Performance insights: Go beyond simple audits. Instruct your agent to record a performance trace and extract actionable insights to optimize your web apps. ✅ Advanced debugging: Empower your AI to analyze network requests, list console messages, take screenshots, and even evaluate scripts in the browser context. ✅ Browser emulation: Easily test different conditions by emulating CPU slowdowns, network throttling, or various screen sizes. Works well with modern web apps and believe this will unlock new workflows for automated testing, AI-driven debugging, and interactive web development. And there's much more to come!
@guntrambechtold My favorite use case so far! 🏆
Unicode 17 is released. The process for upgrading in js tooling is: 1. wait for @mathias to land unicode 17 in test262, e.g. github.com/tc39/test262/p… 2. in js, upgrade to `@unicode/unicode-17.0.0`, e.g. github.com/babel/babel/pu… 3. in Rust, upgrade github.com/oxc-project/un…, which I maintain. blog.unicode.org/2025/09/unicod… jenniferdaniel.substack.com/p/tomorrows-em…
The src attribute on <img> is no longer required. github.com/whatwg/html/is…
@deeheber @brianleroux @begin @sanity_io Congrats!!!
Ever spent ages trying to figure out which element is actually scrolling on a page? #ChromeDevTools added a new scroll badge to help you spot them easier! Ionut & @jecfish will walk us through the technical implementation behind the scenes. Read: developer.chrome.com/blog/swe-devto…
✈️💺 Fasten your seatbelts! DevTools got a turbocharged upgrade with the new AI assistance panel. Debug styling issues, understand layouts, and fix airplanes. Ready for take-off? ➡️ developer.chrome.com/blog/5-cool-th…
Introducing AI Assistance in @ChromeDevTools! 🤯🚀 Ever wish you could have a coding buddy to help you with CSS and layout? Well, your wish is granted! The new AI Assistance in Chrome DevTools is here to make your life as a developer easier, powered by Gemini. The new panel aims to help you find and fix issues. Just ask it questions about your code, and it provides tailored explanations and even suggests solutions. This is our first exploration into agentic AI in DevTools and we're excited to hear what you think of it. Some key features: 1. Conversational prompts: Get tailored suggestions and code snippets. 2. Contextual understanding: AI understands the code you're working on. 3. Step-by-step guidance: Get help with everything from styling to debugging. Want to see it in action? Check out my screencast below to see how I used it to add a dark mode.
✨ More Gemini is coming to DevTools! ✨ Try the new experimental AI assistance panel in Chrome Canary 131 and later to get help understanding layouts and debugging your CSS. Learn more at goo.gle/devtools-ai-as…
📢 New post: The State of ES5 on the Web. For years, we defaulted to transpiling to ES5 in order to support IE. But is that still necessary? I took a look at the data to find out, and I'll just say that the results were *actually* quite surprising! 🙀 philipwalton.com/articles/the-s…
Cory House @housecor
159K Followers 808 Following I help dev teams be insanely productive with AI. Courses: https://t.co/D5emROQHUh & https://t.co/6L1fD89GbP Consulting: https://t.co/Qfp4TfpB8N ⚛️
Addy Osmani @addyosmani
395K Followers 3K Following Director, @GoogleCloud AI. Gemini ✨ Agents. Prev: Eng. leader, @GoogleChrome • Author • Great user, developer & AI experiences • @GoogleAI @GoogleDeepMind
Jarred Sumner @jarredsumner
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Jake Archibald @jaffathecake
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kitze · supermac.io ... @thekitze
101K Followers 916 Following @apple · https://t.co/2lUVc9DzP9 - superpowers for your mac
David K 🎹 @DavidKPiano
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Rich Harris @Rich_Harris
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Matteo Collina @matteocollina
56K Followers 4K Following @platformatic Co-Founder & CTO, @nodejs TSC Chair, Lead maintainer @fastifyjs, Board @OpenJSF, Conference Speaker, Ph.D. Past: @nearform. Views are my own.
Devon Govett @devongovett
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sunil pai @threepointone
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Ben Lesh @BenLesh
63K Followers 2K Following #RxJS core team lead. Dad. Art Lover. Literally not paid by the observable, or for anything RxJS-related. My views actually belong to @_jayphelps. he/him
Adam Rackis @AdamRackis
46K Followers 2K Following Software Engineer. Prev, Riot. TanStack, Next, React, C++ when I'm feeling nasty. Beer, whiskey, coffee snob. Book lover. Jr Developer for life.
Jason Miller 🦊⚛ @_developit
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Seb ⚛️ ThisWeekIn... @sebastienlorber
54K Followers 5K Following 🔥 Join 40k devs - Stay up-to-date with React: • 📨 https://t.co/DvLGHeLY5G • @ThisWeekInReact • @docusaurus maintainer • 🇫🇷
📦🛠👷🏻�... @TheLarkInn
45K Followers 3K Following Speaker, engineer, 🕸️📦 @webpack Core Team, dad, views are my own. SWE @microsoft making @rushstack; Monorepo Janitor for ODSP. Always bet on #JavaScript
Jason Lengstorf @jlengstorf
58K Followers 2K Following I make tv for developers at @codetv_dev web dev can be fun. CodeTV is out to bring a little joy back into learning and building email: [email protected]
Sindre Sorhus @sindresorhus
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Malte Ubl @cramforce
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Chris Heilmann codepo... @codepo8
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Adam Argyle @argyleink
59K Followers 2K Following @Shopify design-engineer; prior @GoogleChrome, @GoogleCloud, CSSWG, and CSS Podcast. Host on @whiskeywebfm, maker of @OpenProps, https://t.co/lb3SDxC6EC and more
Andy Guzik @andyguzik
14 Followers 487 Following Making AI actually work in production - patterns, not hype. Author of Claude and the Code. 10+ yrs shipping React/TS/Node.
D∆RSH∆N T∆MSE @d_tamse24
167 Followers 2K Following Keep it simple✌️ | Manchester United ❤️ | Seek Discomfort⚡ | Front End Developer 💻
Max @MaxiLefranc
12 Followers 234 Following Full-stack dev • Vue.js, PHP, JS enthusiast • Building hotel management software • Watching the web evolve one spec at a time 📸: el.gringo.34
abc @5bpsevC
5 Followers 137 Following
Neelakandan NC @NeelakandanNC
61 Followers 791 Following Building @agentronics | https://t.co/XWWK7LnIYp | AI Agents & Frontier Tech | STEM Enthusiast | ECE @ NITA
Victor @Victor_Sopl
47 Followers 397 Following Building AI solutions on X. Building tools that people and business actually want.
Ruse @ruse_dev
7 Followers 79 Following Mock APIs in Chrome. No server. No setup. No BS. HTTP, WebSocket & GraphQL interception in one click. https://t.co/KIRFxRJWBb
HttpWatch @HttpWatch
135 Followers 10 Following HttpWatch records, inspects and shares Chrome/Edge network traffic for developers, QA and support teams. From the team that co-designed the HAR spec
moses olawole @mosesolawole1
146 Followers 2K Following Jesus Christ's Disciple || Software Developer || Machine Learning Enthusiast || Business Developer || Student of Life
Whisper @cynthiaengozi
158 Followers 545 Following swe | cs grad | Ambassador @womentechmakers @WtmOwerri | Author @gitconnected. Unaffected by drama ❤️💡
Ramazan Arslan @rarslnnn
10 Followers 194 Following
陈 @ChenWei86
10 Followers 416 Following
ᑕOᒪᒪIᑎᔕ @C0llinsxyz
56 Followers 852 Following Writer by day✍️ Software Dev👨🏽💻 Read my insightful thoughts⬇️
Pawan kumar gupta @Pawanku80746953
720 Followers 4K Following SHARE IT MY PASSION ,POL TICS , SOCIAL WORK ETC
Sergi Chafer @sergichafer
0 Followers 44 Following
Andril Siregar @anryl_94
30 Followers 1K Following
Joshua Brunner @joshuajbrunner
132 Followers 3K Following
Andreas Kapp @andreaskapp
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jonny lisa @jonnylisaly
32 Followers 490 Following
Okay @Pankaj9Thorat
28 Followers 413 Following
خالد عبدالل... @abou_abied
45 Followers 1K Following Cybersecurity Researcher | The best code is no code at all | It's not the load that breaks you down, it's the way you carry it.
Satar @satar_nz
589 Followers 7K Following
Hartiana Jean @HartianaJe35838
0 Followers 3 Following
Nikita Tkachev @blink182_LA
16 Followers 623 Following
Garrett @Garrett58863224
0 Followers 12 Following
Samuel korie @blaq_xammie
10 Followers 135 Following Programmer, graphics designer, business computing, computer instructor and computer engineer 🤑😎😇
Juliet @AlexandreJ98992
836 Followers 8K Following you guys should follow me up on this my backup account and also DM me if you're interested on Bitcoin investment because they is real company called moonfare
Raj @itsRajHeree
2 Followers 25 Following
Sam Howell @cast_away_sam
3 Followers 142 Following
solomon yusuf lakama @YusufLakama
18 Followers 139 Following Graphic designer and Frontend developer
Gaston Olvera @GastonOlvera
1K Followers 6K Following Californian since 2000. I design and do things. Many things. I speak for no one but myself, especially my employer.
Michael Pevzner @mikepevzner
11 Followers 90 Following
John Smith @JohnSmithbs9u
1 Followers 173 Following
Sumit Builds @codew1thsumit
1 Followers 11 Following 🚀 BCA Student | Interested in AI/ML, systems, and developer tools | Building in public. #100DaysOfCode
xantifi @xantifi
38 Followers 504 Following
Tooru @TooruTooru4074
1 Followers 24 Following
junior fosso @jfosso847
0 Followers 9 Following
Fousseni Traore @FousseniT7046
0 Followers 2 Following
Mohammed Ateeq @lord_977
11 Followers 122 Following Sometimes you'll have a good day, and sometimes you'll have a bad one, no matter what just keep going.
Mark Polak @Markionium
39 Followers 313 Following
Addy Osmani @addyosmani
395K Followers 3K Following Director, @GoogleCloud AI. Gemini ✨ Agents. Prev: Eng. leader, @GoogleChrome • Author • Great user, developer & AI experiences • @GoogleAI @GoogleDeepMind
Jarred Sumner @jarredsumner
176K Followers 642 Following building @bunjavascript at @anthropicai. formerly: @stripe (twice) @thielfellowship. high school dropout. npm i -g bun
Jake Archibald @jaffathecake
107K Followers 2K Following Developer of sorts at @firefox. No thought goes unpublished. He/him. Also jaffathecake on Mastodon, bsky, Threads etc.
kitze · supermac.io ... @thekitze
101K Followers 916 Following @apple · https://t.co/2lUVc9DzP9 - superpowers for your mac
Rich Harris @Rich_Harris
95K Followers 2K Following Cheese fan. I work on @sveltejs at @vercel. Mostly posting at https://t.co/1DNxt27Pks
Matteo Collina @matteocollina
56K Followers 4K Following @platformatic Co-Founder & CTO, @nodejs TSC Chair, Lead maintainer @fastifyjs, Board @OpenJSF, Conference Speaker, Ph.D. Past: @nearform. Views are my own.
Devon Govett @devongovett
42K Followers 1K Following Creator of @parceljs. Engineer @adobe working on React Aria and React Spectrum.
Ben Lesh @BenLesh
63K Followers 2K Following #RxJS core team lead. Dad. Art Lover. Literally not paid by the observable, or for anything RxJS-related. My views actually belong to @_jayphelps. he/him
Jason Miller 🦊⚛ @_developit
63K Followers 2K Following Platform DX @Shopify. Created @preactjs. Do more with less. https://t.co/z1d6J24DlE @[email protected]
📦🛠👷🏻�... @TheLarkInn
45K Followers 3K Following Speaker, engineer, 🕸️📦 @webpack Core Team, dad, views are my own. SWE @microsoft making @rushstack; Monorepo Janitor for ODSP. Always bet on #JavaScript
Sindre Sorhus @sindresorhus
65K Followers 517 Following I make apps and open source. Made @awesome__re. Also: @sindre_gh_repos @[email protected]
Malte Ubl @cramforce
48K Followers 905 Following Self-driving infrastructure @Vercel CTO. Immigrant 🇺🇸/🇩🇪/acc
Chris Heilmann codepo... @codepo8
66K Followers 2K Following The robots are coming and we need to make a great example for them. Author, presenter, A11y lover, Online teacher at Skillshare and LinkedIn Learning
Mark Dalgleish @markdalgleish
73K Followers 0 Following 🇦🇺🐨 / Working on 💿 @ReactRouter + @remix_run at @shopify / co-creator of 🦄 CSS Modules, 🧁 Vanilla Extract / @MelbJS organiser / dad x4
Adam Argyle @argyleink
59K Followers 2K Following @Shopify design-engineer; prior @GoogleChrome, @GoogleCloud, CSSWG, and CSS Podcast. Host on @whiskeywebfm, maker of @OpenProps, https://t.co/lb3SDxC6EC and more
Surma @DasSurma
38K Followers 1K Following DX & monorepo at @ShopifyEng Craving simplicity, finding it nowhere. Internetrovert 🏳️🌈 He/him.
Lea Verou, PhD @LeaVerou
117K Followers 1K Following Product, web standards, usability • @csswg Invited Expert • @w3ctag alum • CS/HCI PhD @MIT Also: 🐘 @[email protected] • 🦋 @lea.verou.me
Minko Gechev @mgechev
58K Followers 226 Following Generative UI and AI developer productivity at Google. Martial arts and metal music. Opinions are my own 🇧🇬🇺🇸
Ahmad Shadeed @shadeed9
26K Followers 208 Following Design Engineer. 🎼 CSS Course: https://t.co/1YV2dr5Xp5 📘 https://t.co/u2Mwa0NV16 ✍️ https://t.co/uZCVbHrztF 📪 https://t.co/CRKmRtzka1 📂 https://t.co/VTAAYbMRu8, https://t.co/Jy2gQ97l4L
Niantic Support @NianticHelp
453K Followers 13K Following Official support account for @pokemongoapp, @pikminbloom, @mh_now_en and @nianticwayfarer. Now a part of @Scopely!
Matan Borenkraout �... @matanbobi
1K Followers 299 Following Principal SE @Microsoft · @TestingLib maintainer · Creating better software, one word at a time · Be kind Follow for some FE tips 👋 DMs are open, reach out 😀
Dmitry Lyalin @LyalinDotCom
22K Followers 8K Following Builder @ Google. 26yrs of summoning code • prev: @geminicli, @firebase, @microsoft | 👨👦 Dad 24/7 • 🏯 Sumo fan • 💭 Opinions mine 🇺🇸 🇺🇦
Kun Chen @kunchenguid
9K Followers 144 Following Solo builder. Former L8 engineer at Meta, Microsoft, Atlassian.
PokeMiners @poke_miners
130K Followers 85 Following We are a group of dataminers for Pokémon GO! https://t.co/Bp50PPT71x Discord: https://t.co/DgWH7AO1AF Ko-Fi: https://t.co/Pq3Ng05nWX Contact: [email protected]
Peter Steinberger �... @steipete
534K Followers 2K Following Polyagentmorous ClawFather. Came back from retirement to mess with AI and help a lobster take over the world. @OpenClaw🦞 + @OpenAI
The Pokemod Group @thepokemodgroup
40K Followers 22 Following Elevate your Pokémon Go journey. Experience a unique, richer gameplay with Pokemod.
Samiya Caur @samiyacaur
38 Followers 36 Following
Isomorphic Labs @IsomorphicLabs
57K Followers 80 Following Solve all disease. Developing and applying frontier AI to unlock deeper scientific insights, faster breakthroughs, and life-changing medicines.
Mira Murati @miramurati
606K Followers 618 Following Now building @thinkymachines. Previously CTO @OpenAI
Lauro Moura @lauromoura
369 Followers 611 Following Dad, WebKit developer @igalia, wannabe "bug" photographer (@inaturalist rocks!) Also Santa Cruz Futebol Clube sufferer. I mean, supporter.
Uliana Andriieshyna �... @uliana_munich
231 Followers 197 Following Community Creator passionate about connecting people and tech. Owner of @frontMUC meetups and co-organizer of @TheFrontConf/@PyConWeb
CipSoft @CipSoft
5K Followers 17 Following CipSoft is an independent developer and operator of online games for various platforms.
Boshen @boshen_c
12K Followers 607 Following VP of Engineering @voidzerodev, Creator of @OxcProject. Learning to be a dad. Follow me for JavaScript, Rust, and how I use AI.
Christina Warren @film_girl
98K Followers 14K Following DevRel @GitHub Past: @GoogleDeepMind, hosts: @ovrtrd Journalist turned developer. @[email protected]. Loves media, tech and OSS. opinions = own
Tim Vereecke @TimVereecke
2K Followers 959 Following Loves speeding up websites. Web performance architect @Akamai, also runs https://t.co/mPiq48nQnu and https://t.co/1K6mO9oOGq #WebPerf #PageSpeed #SEO
Benjamin Aster @Benjamin_Aster
562 Followers 1K Following Austrian nerd doing silly {programming/math} things {on/in} my {computer/head}. Int{-ernet 🌐/ -egers 🔢/ -ergalactic, planetary 🤖}. 👨🏻🎓 @TUGraz/@UniGraz
Logan Kilpatrick @OfficialLoganK
326K Followers 3K Following Member of technical staff, working on Gemini, @GoogleAIStudio, the Gemini API, & Kaggle. My views!
Freya Holmér @FreyaHolmer
125K Followers 1K Following ⭕ I made Shapes & Shader Forge 🔥 shader sorceress 🎨 artist 📏 math influencer 💜 twitch partner 📡 ex-founder of @NeatCorp banner: @YO_SU_RA
ed(1) Conference @ed1conf
2K Followers 13 Following The premier conference for ed(1), the standard text editor. A bit snarky. Accessible at 300 baud. Masto: @[email protected] https://t.co/9xThaFaYMH
reb @rebmasel
56K Followers 550 Following 31/J.D./Attorney/Author/2.1M on TikTok (scary but thx)/“the chick who reads court transcripts?”/host of @rebuttalpod❤️🔥 MERCH OUT NOW🩵⬇️
Ryan Dahl @rough__sea
42K Followers 375 Following cofounder of @deno_land, creator of @nodejs. often goes by ry.
The Olympic Games @Olympics
5.8M Followers 5K Following Excellence, respect and friendship 🕊️ ES: @JuegosOlimpicos FR: @JeuxOlympiques HI/EN: @OlympicKhel JA: @Gorin KO: @Olympic PT: @JogosOlimpicos RU: @Olympia_da
swamp hag ✨☕️�... @potatoslav
16K Followers 910 Following rachel | jersey🇺🇸 ➡️ germany🇩🇪 (not berlin) | cool mom 😎 | shitposting | i’m probably joking
nolen @itseieio
25K Followers 703 Following one million checkboxes/chessboards, https://t.co/rXQU7beXZU, https://t.co/qH1JodNJMM, etc. the internet can still be fun! alum recurse, jane street
Ashley M. Gjøvik @ashleygjovik
17K Followers 3K Following A true-crime-podcast Twitter account dedicated to my whistleblower legal battle with Apple Computer Notes: lawyer but nothing's legal advice; actually autistic
Daniel Lemire @lemire
36K Followers 2K Following Software performance expert. Ranked in the top 2% of scientists globally (Stanford/Elsevier 2025) and among GitHub's top 1000 developers. Father, husband.
Twin Galaxies @TwinGalaxies
13K Followers 9 Following Video Game Player Achievement Recognition For 35+ Years! Join the Community - Compete - Meet Friends
Selenium @SeleniumHQ
24K Followers 264 Following Selenium is a browser automation framework and ecosystem for developers and testers.
Patrick Spicer @patrickspicers
7K Followers 343 Following Comedian!! 👇Sign up to my mailing list for live shows in YOUR area👇
World Bollard Associa... @WorldBollard
195K Followers 24 Following The official Twitter account of the World Bollard Association™️. MERCH STORE - https://t.co/lGlBqCjY49
Soren Iverson @soren_iverson
289K Followers 128 Following Idea guy. Building @iverson and @stompersapp
Nicolas CHEVOBBE @nicolaschevobbe
908 Followers 14 Following @FirefoxDevTools engineer at @Mozilla Open Web & skateboarding 🐘 @[email protected]
Will Harris @parityzero
4K Followers 801 Following Chrome Security gnome. I work on the sandbox and local data protection on Windows. @parityzero.99 on signal. Opinions here are my own!
Kath Korevec @simpsoka
30K Followers 601 Following Codex @OpenAI. Previously GitHub, Google, Vercel, Heroku.
ali @endingwithali
30K Followers 444 Following software engineer - content creator @ https://t.co/4vI4dOxzmn - threatwire host @hak5 - nyc - MIT - jewish
Obbe Vermeij @ObbeVermeij
72K Followers 291 Following I make games. @SpaceStationSV (N64), @warthegame (steam), @LearniaApp, @GuideApp__, Coming soon: @PlentifulGame Also: gta3, Vice, SA & IV 🕊️ for 🇵🇸
Ollie Williams @hypeddev
679 Followers 71 Following I tweet about UX, web design and new CSS/HTML/frontend web stuff.
shadcn @shadcn
225K Followers 402 Following I own a computer / Working on https://t.co/HJcOr0AUAr & https://t.co/5FRvxukoY5.
Internal Tech Emails @TechEmails
595K Followers 888 Following Internal tech industry emails that surface in public records. 🔍






















