Chrome for Developers
@developer.chrome.com
The Official Chromium Developers Account.
Check out our developer portals: https://developer.chrome.com/ and https://web.dev/
Check out our developer portals: https://developer.chrome.com/ and https://web.dev/
Reposted by Chrome for Developers
We just launched experimental ad metrics in the Chrome User Experience Report (CrUX):
- Ad Count
- Ad Density
- Ad Weight: Network
- Ad Weight: CPU
These metrics are a set of ad-related measurements that provide transparency into sites' ad experiences.
developer.chrome.com/blog/crux-ad...
1/8 🧵
- Ad Count
- Ad Density
- Ad Weight: Network
- Ad Weight: CPU
These metrics are a set of ad-related measurements that provide transparency into sites' ad experiences.
developer.chrome.com/blog/crux-ad...
1/8 🧵
New ad metrics in Chrome User Experience Report | Blog | Chrome for Developers
Learn about the new ad metrics now available in the Chrome User Experience Report (CrUX)
developer.chrome.com
September 15, 2026 at 4:29 PM
We just launched experimental ad metrics in the Chrome User Experience Report (CrUX):
- Ad Count
- Ad Density
- Ad Weight: Network
- Ad Weight: CPU
These metrics are a set of ad-related measurements that provide transparency into sites' ad experiences.
developer.chrome.com/blog/crux-ad...
1/8 🧵
- Ad Count
- Ad Density
- Ad Weight: Network
- Ad Weight: CPU
These metrics are a set of ad-related measurements that provide transparency into sites' ad experiences.
developer.chrome.com/blog/crux-ad...
1/8 🧵
Check out what's arriving in Chrome 154 beta → goo.gle/4yq2n2I
Explore new CSS features like scroll-marker-group modes, WebCrypto post-quantum algorithms, and Iterator includes() method.
Explore new CSS features like scroll-marker-group modes, WebCrypto post-quantum algorithms, and Iterator includes() method.
September 14, 2026 at 5:23 PM
Check out what's arriving in Chrome 154 beta → goo.gle/4yq2n2I
Explore new CSS features like scroll-marker-group modes, WebCrypto post-quantum algorithms, and Iterator includes() method.
Explore new CSS features like scroll-marker-group modes, WebCrypto post-quantum algorithms, and Iterator includes() method.
Open up your app's inner workings to AI agents with custom tools in DevTools for agents→ goo.gle/4r5H3x7
Write plain JavaScript to build tailored third-party tools that save tokens and bypass manual steps like login forms built for humans.
Write plain JavaScript to build tailored third-party tools that save tokens and bypass manual steps like login forms built for humans.
September 10, 2026 at 4:40 PM
Open up your app's inner workings to AI agents with custom tools in DevTools for agents→ goo.gle/4r5H3x7
Write plain JavaScript to build tailored third-party tools that save tokens and bypass manual steps like login forms built for humans.
Write plain JavaScript to build tailored third-party tools that save tokens and bypass manual steps like login forms built for humans.
Handling protected APIs clipboard access, fullscreen mode, or media autoplay requires knowing if a visitor is actively engaged.
The UserActivation API, now Baseline widely available, provides details about whether a user is interacting with your page or has done so since loading → goo.gle/4r3DGqz
The UserActivation API, now Baseline widely available, provides details about whether a user is interacting with your page or has done so since loading → goo.gle/4r3DGqz
September 9, 2026 at 3:56 PM
Handling protected APIs clipboard access, fullscreen mode, or media autoplay requires knowing if a visitor is actively engaged.
The UserActivation API, now Baseline widely available, provides details about whether a user is interacting with your page or has done so since loading → goo.gle/4r3DGqz
The UserActivation API, now Baseline widely available, provides details about whether a user is interacting with your page or has done so since loading → goo.gle/4r3DGqz
Reposted by Chrome for Developers
Back in June I shared a demo of a grid that smoothly animates on resize without JS or View Transitions.
I finally sat down to write up how it works: CSS Anchor Positioning + scoped anchors + regular CSS transitions.
→ brm.us/animated-grid
I finally sat down to write up how it works: CSS Anchor Positioning + scoped anchors + regular CSS transitions.
→ brm.us/animated-grid
September 7, 2026 at 9:31 PM
Back in June I shared a demo of a grid that smoothly animates on resize without JS or View Transitions.
I finally sat down to write up how it works: CSS Anchor Positioning + scoped anchors + regular CSS transitions.
→ brm.us/animated-grid
I finally sat down to write up how it works: CSS Anchor Positioning + scoped anchors + regular CSS transitions.
→ brm.us/animated-grid
Reposted by Chrome for Developers
I’m excited to share that we've added a consequential hint to the WebMCP spec!
For site devs: set to true when WebMCP tools may perform a high-stakes action: anything that needs explicit user permission in order to execute. If you’re going to make a purchase, send an email, or book travel.
For site devs: set to true when WebMCP tools may perform a high-stakes action: anything that needs explicit user permission in order to execute. If you’re going to make a purchase, send an email, or book travel.
Imperative API | AI in Chrome | Chrome for Developers
Define many types of WebMCP tools with standard JavaScript.
developer.chrome.com
September 8, 2026 at 1:36 PM
I’m excited to share that we've added a consequential hint to the WebMCP spec!
For site devs: set to true when WebMCP tools may perform a high-stakes action: anything that needs explicit user permission in order to execute. If you’re going to make a purchase, send an email, or book travel.
For site devs: set to true when WebMCP tools may perform a high-stakes action: anything that needs explicit user permission in order to execute. If you’re going to make a purchase, send an email, or book travel.
Here's what's new in Modern Web Guidance v0.0.186 → goo.gle/4xcsdWW
⌨️ New guide on IME-safe textarea submission, along with recs for handling KeyboardEvent.isComposing for IME
🔎 Mandatory code verification step for agents in the global MWG skill
⌨️ New guide on IME-safe textarea submission, along with recs for handling KeyboardEvent.isComposing for IME
🔎 Mandatory code verification step for agents in the global MWG skill
Release v0.0.186 · GoogleChrome/modern-web-guidance
Release Notes: v0.0.186
🆕 New Guides
Added the ime-safe-enter-submit guide, which provides implementation strategies for handling "Enter to submit" patterns in textareas without interrupting Input...
goo.gle
September 8, 2026 at 2:46 PM
Here's what's new in Modern Web Guidance v0.0.186 → goo.gle/4xcsdWW
⌨️ New guide on IME-safe textarea submission, along with recs for handling KeyboardEvent.isComposing for IME
🔎 Mandatory code verification step for agents in the global MWG skill
⌨️ New guide on IME-safe textarea submission, along with recs for handling KeyboardEvent.isComposing for IME
🔎 Mandatory code verification step for agents in the global MWG skill
Time is running out to enter the OpenAIDevs WebMCP Challenge ⌛
Polish up your final submissions, show us your agent-ready web apps, and win prizes → goo.gle/4x20isR
Polish up your final submissions, show us your agent-ready web apps, and win prizes → goo.gle/4x20isR
For everyone who said “just one more commit.”
Deadline extended:
Deadline extended:
September 3, 2026 at 7:07 PM
Time is running out to enter the OpenAIDevs WebMCP Challenge ⌛
Polish up your final submissions, show us your agent-ready web apps, and win prizes → goo.gle/4x20isR
Polish up your final submissions, show us your agent-ready web apps, and win prizes → goo.gle/4x20isR
Interop 2027 proposals are officially open → goo.gle/4xh1tEY
Which web platform features need better cross-browser compatibility next year? Submit your ideas before September 23rd. Also be sure to like and comment on submitted ideas.
Which web platform features need better cross-browser compatibility next year? Submit your ideas before September 23rd. Also be sure to like and comment on submitted ideas.
September 3, 2026 at 4:21 PM
Interop 2027 proposals are officially open → goo.gle/4xh1tEY
Which web platform features need better cross-browser compatibility next year? Submit your ideas before September 23rd. Also be sure to like and comment on submitted ideas.
Which web platform features need better cross-browser compatibility next year? Submit your ideas before September 23rd. Also be sure to like and comment on submitted ideas.
Chrome 153 is now in beta → goo.gle/4xY3INV
Try out new CSS scroll container options, Rust-based XML parsing, declarative camera and microphone HTML elements, and the new WebGPU buffer_view feature.
Try out new CSS scroll container options, Rust-based XML parsing, declarative camera and microphone HTML elements, and the new WebGPU buffer_view feature.
Chrome 153 beta | Blog | Chrome for Developers
Get a preview of the next Chrome release with this post detailing the features in the current beta.
goo.gle
August 28, 2026 at 7:44 PM
Chrome 153 is now in beta → goo.gle/4xY3INV
Try out new CSS scroll container options, Rust-based XML parsing, declarative camera and microphone HTML elements, and the new WebGPU buffer_view feature.
Try out new CSS scroll container options, Rust-based XML parsing, declarative camera and microphone HTML elements, and the new WebGPU buffer_view feature.
Why choose between local performance and cloud reliability?
Firebase AI Logic lets you run Gemini Nano directly in Chrome for Desktop, automatically switching to cloud models whenever needed, providing local privacy with cloud fallback.
Try the setup workflow → goo.gle/4gmipV9
Firebase AI Logic lets you run Gemini Nano directly in Chrome for Desktop, automatically switching to cloud models whenever needed, providing local privacy with cloud fallback.
Try the setup workflow → goo.gle/4gmipV9
August 27, 2026 at 2:40 PM
Why choose between local performance and cloud reliability?
Firebase AI Logic lets you run Gemini Nano directly in Chrome for Desktop, automatically switching to cloud models whenever needed, providing local privacy with cloud fallback.
Try the setup workflow → goo.gle/4gmipV9
Firebase AI Logic lets you run Gemini Nano directly in Chrome for Desktop, automatically switching to cloud models whenever needed, providing local privacy with cloud fallback.
Try the setup workflow → goo.gle/4gmipV9
Create agent-ready web apps for the WebMCP Challenge → goo.gle/4qpDQYV
We're excited to see ChatGPT supporting WebMCP, the experimental standard that lets users and AI agents navigate websites together. In the @openaibot.bsky.social WebMCP Challenge you can experiment with it and win prizes.
We're excited to see ChatGPT supporting WebMCP, the experimental standard that lets users and AI agents navigate websites together. In the @openaibot.bsky.social WebMCP Challenge you can experiment with it and win prizes.
August 25, 2026 at 9:18 PM
Create agent-ready web apps for the WebMCP Challenge → goo.gle/4qpDQYV
We're excited to see ChatGPT supporting WebMCP, the experimental standard that lets users and AI agents navigate websites together. In the @openaibot.bsky.social WebMCP Challenge you can experiment with it and win prizes.
We're excited to see ChatGPT supporting WebMCP, the experimental standard that lets users and AI agents navigate websites together. In the @openaibot.bsky.social WebMCP Challenge you can experiment with it and win prizes.
Discover web platform capabilities landing this month → goo.gle/4zkP8S9
Explore additions like the ruby-overhang CSS property, declarative Shadow DOM manual slot assignment, and the new usermedia element.
Explore additions like the ruby-overhang CSS property, declarative Shadow DOM manual slot assignment, and the new usermedia element.
August 25, 2026 at 3:39 PM
Discover web platform capabilities landing this month → goo.gle/4zkP8S9
Explore additions like the ruby-overhang CSS property, declarative Shadow DOM manual slot assignment, and the new usermedia element.
Explore additions like the ruby-overhang CSS property, declarative Shadow DOM manual slot assignment, and the new usermedia element.
Explicitly set subgroup sizes in WGSL compute shaders with WebGPU. Fine-tune AI workloads on specific platforms using the new @subgroup_size attribute. See the full release details → goo.gle/4gLeGj9
August 24, 2026 at 4:04 PM
Explicitly set subgroup sizes in WGSL compute shaders with WebGPU. Fine-tune AI workloads on specific platforms using the new @subgroup_size attribute. See the full release details → goo.gle/4gLeGj9
Skip writing complex JavaScript to make form elements like textarea fit user input 🍝
The field-sizing CSS property is a newly available Baseline feature that lets form controls naturally adjust their sizing to fit their contents. Find the documentation here → goo.gle/4a1HJMM
The field-sizing CSS property is a newly available Baseline feature that lets form controls naturally adjust their sizing to fit their contents. Find the documentation here → goo.gle/4a1HJMM
August 21, 2026 at 7:40 PM
Skip writing complex JavaScript to make form elements like textarea fit user input 🍝
The field-sizing CSS property is a newly available Baseline feature that lets form controls naturally adjust their sizing to fit their contents. Find the documentation here → goo.gle/4a1HJMM
The field-sizing CSS property is a newly available Baseline feature that lets form controls naturally adjust their sizing to fit their contents. Find the documentation here → goo.gle/4a1HJMM
Chrome 152 is now in beta
Explore new capabilities including connection allowlists, native PWA notification attribution on macOS, and relative alpha colors in CSS.
Get all the details → goo.gle/4hKiumS
Explore new capabilities including connection allowlists, native PWA notification attribution on macOS, and relative alpha colors in CSS.
Get all the details → goo.gle/4hKiumS
August 20, 2026 at 3:27 PM
Chrome 152 is now in beta
Explore new capabilities including connection allowlists, native PWA notification attribution on macOS, and relative alpha colors in CSS.
Get all the details → goo.gle/4hKiumS
Explore new capabilities including connection allowlists, native PWA notification attribution on macOS, and relative alpha colors in CSS.
Get all the details → goo.gle/4hKiumS
For any devs in the region, we have a great opportunity for you to collaborate with us ⬇️
🚀 The WebGPU Working Group is meeting in Paris this November, and they need your real-world insights to shape the future of the standard!
Tell us what works well and what needs improvement 👇
📊 Take the survey: forms.gle/H57wGhsTFjQb...
[1/3]
Tell us what works well and what needs improvement 👇
📊 Take the survey: forms.gle/H57wGhsTFjQb...
[1/3]
WebGPU Developer Survey 2026
The WebGPU / WGSL standardization group is meeting in November and your feedback will help shape the agenda and prioritize future developments of the API and language.
Results will be summarized and ...
forms.gle
August 19, 2026 at 2:42 PM
For any devs in the region, we have a great opportunity for you to collaborate with us ⬇️
We are looking for a few more developers to join our WebDev Insights community → goo.gle/3OvuA6T
This is your chance to participate in user research, test out experimental tools, & directly shape upcoming Chrome features. Grab one of the last spots and help us build the future of the web ecosystem.
This is your chance to participate in user research, test out experimental tools, & directly shape upcoming Chrome features. Grab one of the last spots and help us build the future of the web ecosystem.
August 19, 2026 at 2:17 PM
We are looking for a few more developers to join our WebDev Insights community → goo.gle/3OvuA6T
This is your chance to participate in user research, test out experimental tools, & directly shape upcoming Chrome features. Grab one of the last spots and help us build the future of the web ecosystem.
This is your chance to participate in user research, test out experimental tools, & directly shape upcoming Chrome features. Grab one of the last spots and help us build the future of the web ecosystem.
Check out the latest updates in Chrome 151 DevTools → bit.ly/4x6YmQE
Explore CSS specificity tooltips, improved JavaScript memory debugging, and updated device emulation presets.
Explore CSS specificity tooltips, improved JavaScript memory debugging, and updated device emulation presets.
August 17, 2026 at 9:17 PM
Check out the latest updates in Chrome 151 DevTools → bit.ly/4x6YmQE
Explore CSS specificity tooltips, improved JavaScript memory debugging, and updated device emulation presets.
Explore CSS specificity tooltips, improved JavaScript memory debugging, and updated device emulation presets.
Reposted by Chrome for Developers
Nice teardown of how the Modern Web Guidance skill actually works by @nucliweb.net
joanleon.dev/en/modern-we...
A lot of thought went into being as token-efficient as possible!
joanleon.dev/en/modern-we...
A lot of thought went into being as token-efficient as possible!
A skill that knows nothing: the architecture of Modern Web Guidance | Joan León
Modern Web Guidance doesn't keep the knowledge in the skill, it teaches the agent to retrieve it. Local semantic search with MiniLM and TensorFlow.js, guides with their own grader, and empirical calib...
joanleon.dev
August 13, 2026 at 5:28 PM
Nice teardown of how the Modern Web Guidance skill actually works by @nucliweb.net
joanleon.dev/en/modern-we...
A lot of thought went into being as token-efficient as possible!
joanleon.dev/en/modern-we...
A lot of thought went into being as token-efficient as possible!
What if we could remove the friction in the email → goo.gle/4fsFpjG
The proposed Email Verification API would let your site validate the email address right in the browser! No email sent, no confirmation click needed.
The proposed Email Verification API would let your site validate the email address right in the browser! No email sent, no confirmation click needed.
August 17, 2026 at 4:03 PM
What if we could remove the friction in the email → goo.gle/4fsFpjG
The proposed Email Verification API would let your site validate the email address right in the browser! No email sent, no confirmation click needed.
The proposed Email Verification API would let your site validate the email address right in the browser! No email sent, no confirmation click needed.
Check web platform feature availability in Lighthouse → goo.gle/3TXx3cO
Baseline status details are now in the Best Practices section, including:
🌐 Widely available features
🛠️ Newly available capabilities
⚠️ Limited availability code
Baseline status details are now in the Best Practices section, including:
🌐 Widely available features
🛠️ Newly available capabilities
⚠️ Limited availability code
August 14, 2026 at 7:10 PM
Check web platform feature availability in Lighthouse → goo.gle/3TXx3cO
Baseline status details are now in the Best Practices section, including:
🌐 Widely available features
🛠️ Newly available capabilities
⚠️ Limited availability code
Baseline status details are now in the Best Practices section, including:
🌐 Widely available features
🛠️ Newly available capabilities
⚠️ Limited availability code
Meet Chrome DevTools Connect for WebStorm → goo.gle/4i2wPuL
Now your AI agent can open Chrome, inspect rendering, read console logs, and verify runtime fixes without you leaving the WebStorm IDE.
Now your AI agent can open Chrome, inspect rendering, read console logs, and verify runtime fixes without you leaving the WebStorm IDE.
August 12, 2026 at 4:51 PM
Meet Chrome DevTools Connect for WebStorm → goo.gle/4i2wPuL
Now your AI agent can open Chrome, inspect rendering, read console logs, and verify runtime fixes without you leaving the WebStorm IDE.
Now your AI agent can open Chrome, inspect rendering, read console logs, and verify runtime fixes without you leaving the WebStorm IDE.
Modern Web Guidance passkey skills give coding agents like Claude Code and Antigravity the knowledge to build secure authentication loops autonomously → goo.gle/4bLzqp1
In our test on Claude Code Opus 4.8, an implementation using these passkey skills significantly outperformed one without them.
In our test on Claude Code Opus 4.8, an implementation using these passkey skills significantly outperformed one without them.
August 12, 2026 at 4:13 PM
Modern Web Guidance passkey skills give coding agents like Claude Code and Antigravity the knowledge to build secure authentication loops autonomously → goo.gle/4bLzqp1
In our test on Claude Code Opus 4.8, an implementation using these passkey skills significantly outperformed one without them.
In our test on Claude Code Opus 4.8, an implementation using these passkey skills significantly outperformed one without them.
✨ Get deeper insights into your data within the AI assistance panel → goo.gle/4p3oIzA
Nine additional widgets now feature data from across your panels to help you understand what Gemini uses:
📊 Performance events
🌐 Network requests
📜 Resource content
Nine additional widgets now feature data from across your panels to help you understand what Gemini uses:
📊 Performance events
🌐 Network requests
📜 Resource content
August 11, 2026 at 7:40 PM
✨ Get deeper insights into your data within the AI assistance panel → goo.gle/4p3oIzA
Nine additional widgets now feature data from across your panels to help you understand what Gemini uses:
📊 Performance events
🌐 Network requests
📜 Resource content
Nine additional widgets now feature data from across your panels to help you understand what Gemini uses:
📊 Performance events
🌐 Network requests
📜 Resource content