The specification smells a little funny, but we've already implemented emulation for it.

If you're looking to up your CSS layout game, Ahmad is definitely the person to go to, and the layout maestro looks great. Get it before tomorrow!

If you find yourself needing to pitch Polypane to your colleagues, PM or CTO, we made a handy list of common questions they might have and how to address them! polypane.app/docs/pitchin...

Polypane's elements panel shows editable pseudo styles as well as @starting-style for any element. This is already extremely useful, and it's unique among browser devtools. In the next release, you can toggle their state right from the styles💡 Excellent idea by @yatil.social, can't wait to ship!

I'm already so used to the hold-alt/option-to-inspect tool that I REPEATEDLY try to use it in other browsers despite only having this ability for a few weeks with @polypane.app! 😂🤩

By the way, there are *tons* of other features that Polypane has that devs asked for in other devtools. Here's an article from 2024 listing developer requests that Polypane already provided. Things have only gotten better since then. polypane.app/blog/the-dev...

Polypane is really cool

Finding the containing block is *super easy* in @Polypane.app, which literally just lists it for each element in the Elements panel. Along with the offsetParent and the stacking context parent, two other important concepts that often confuse devs Way too many developers are sleeping on Polypane ;)

One thing that a lot of you have reported feels missing in Polypane peek (our awesome hold-alt/option-to-inspect tool polypane.app/docs/polypan... ) are grid and flexbox layout visualisations. Building it is ...complex, but luckily our own site has plenty of stress tests like the one below!

We just released Polypane 28.0.2 with many bugfixes, big performance improvements throughout the app, 25% smaller installer size, new warnings in the outline and meta panels and a fix for macOS autoupdate. 🥳 Except the fix for macOS autoupdate didn't work. 😬 so we also released 28.0.3 to fix that 😎

We just got recognised as the most innovative web developer browser in the Business Excellence Awards by Acquisition International magazine! 😎

Not enough people know this! Sharing your localhost to a public URL takes just two clicks in @polypane.app. 👨‍🍳💋 for testing on all your real-world devices. Interactions are synced, logging is sent to Polypane. 😍 for letting others see your WIPs. Share your stuff w/o deploying polypane.app/portal/

If you turn on "AI-suggestions" (that are so bad they preemptively warn you it's probably wrong and also maybe don't run it), Google will slop up your console history and let human reviewers see it. Use a browser where the dev can't be bothered to ex-filtrate your data. Try @polypane.app.

Not enough people know this! Sharing your localhost to a public URL takes just two clicks in @polypane.app. 👨‍🍳💋 for testing on all your real-world devices. Interactions are synced, logging is sent to Polypane. 😍 for letting others see your WIPs. Share your stuff w/o deploying polypane.app/portal/

Kilian is in Montreal, Canada all week for Confoo. If you’re at Confoo: come say hi, Kilian brought stickers. If you’re not, you really should be! If you want a Polypane demo at your office this week, reach out!

Accessibility researcher (and Polypane user) @200ok.nl was on national TV just now to talk about the (lack of) accessibility of online chatbot and …what’s that on his laptop? 👀

How to Debug the “@ starting-style” At-Rule in Polypane, by @polypane.app: https://polypane.app/blog/how-to-debug-the-starting-style-at-rule-in-polypane/ #howtos #debugging #css #animations #polypane

Direct, actionable feedback and insights while you develop is exactly our goal with Polypane 🤩

We just released version 28.0.1 with some bug fixes and nice quality-of-life improvements! Full changelog: polypane.app/blog/polypan...

This seems to be missing a Dutch browser vendor 🤔 Don’t worry, @polypane.app will definitely be there as well.

I've been using @polypane.app for about a week and it's going great. It's like 1000x better than Safari for dev & the # of ways it's made my accessibility auditing workflow better is impressive. Seems like every time I search the docs "can I do XYZ?" the answer is yes! Hope to write about it soon.

How to debug the @starting-style at-rule in Polypane Why @starting-style exists, how to use it, how to inspect and edit it, and a little bit about what makes Polypane's elements panel so different from other devtools and why that makes things better for you. polypane.app/blog/how-to-...

Polypane 28: Project Improvements, Elements Panel Updates, and Chromium 146, by @polypane.app: https://polypane.app/blog/polypane-28-project-improvements-elements-panel-updates-and-chromium-146/ #releasenotes #polypane #browsers

Great release 💯 I just managed to reproduce a bug I've be failing to do in Chrome for a long time, simply because I've been trying to do it in full width! Panes are a really powerful way to quickly gain confidence that your thing works across multiple viewports.

Did you know you can right-click any element with an ID to get a link to the document fragment? And just as easily have it formatted as markdown? One of the many things that takes dozens of steps in other browsers that takes two clicks in Polypane.

Don't have chrome canary with experimental platform features set up? Don't worry, also works like a charm in @polypane.app ;)

How to debug the @starting-style at-rule in Polypane Why @starting-style exists, how to use it, how to inspect and edit it, and a little bit about what makes Polypane's elements panel so different from other devtools and why that makes things better for you. polypane.app/blog/how-to-...

If you tried installing a VPN or proxy extension into Polypane, can you tell us why? It happens a lot and it's a use case we really want to understand. We follow back, so you can DM if you prefer 🙏

Did you know you can right-click any element with an ID to get a link to the document fragment? And just as easily have it formatted as markdown? One of the many things that takes dozens of steps in other browsers that takes two clicks in Polypane.

When working on your own site in Polypane, you probably want to exclude your visits from your analytics tool. We made a list of analytics tools and how do to that directly in Polypane or in their settings. If your analytics tool isn't listed, let us know! polypane.app/docs/website...

Immediately mesmerized on open 😍

It's magical when products feel tailor made for you and "just work", that's how I'd describe Polypane. It's the vibe I strive for with Be Inclusive too, so being able to easily jump from one to the other now is a full circle moment for me, so proud! #SotB26 is 2 weeks out, get your tickets ASAP!

Polypane 28 is here! This first release of 2026 comes with plenty of improvements to Projects, the new Environments feature prevents you from confusing production for localhost, the Elements panel is faster and more powerful than ever, and it now runs on Chromium 146. polypane.app/blog/polypan...

Did you know we wrote a deep dive on offset parents and stacking context? Two essential concepts when it comes to positioning in all three dimensions. They're hard to debug, but not with Polypane! Contexts are just listed in our elements panel, easy peasy. Read here: polypane.app/blog/offset-...

Understanding the Fundamentals of CSS Layout, by @polypane.app: https://polypane.app/blog/understanding-the-fundamentals-of-css-layout/ #fundamentals #css #layout #grids #flexbox

This edition is kindly sponsored by @polypane.app 🫶 The CSS Selection already contained several links to Polypane, even before I decided to accept sponsors. Having @kilianvalkhof.com contact me felt like puzzle pieces coming together. Super stoked and proud!

Announcing The CSS Selection! 📰 www.projectwallace.com/the-css-sele... 📚 100,000 websites ⏱️ 100+ metrics 🔖 7 chapters The biggest deep-dive ever into real-world use of CSS across the globe. Dive in and find out some hidden gems. Also, see how much of 'the new CSS' is actually used!

Our upcoming release has some nice improvements to our form inspector, but did you know we also have a free online form inspector? Paste in your HTML to get an overview of your form's structure to find issues and make improvements polypane.app/form-inspect...

Our upcoming release has some nice improvements to our form inspector, but did you know we also have a free online form inspector? Paste in your HTML to get an overview of your form's structure to find issues and make improvements polypane.app/form-inspect...

We can't wait for the inaugural CSS Selection to be released!

If you are experiencing hardship, frustration and lack of qualitative feedback during your day-to-day web development activities, it is our professional recommendation that you

As promised on my previous post. If you work in web dev, get this tool! Just improved my web dev workflow by getting a @polypane.app subscription! 🥳 🔥 🤩 polypane.app

@polypane.app is amazing. I got the trial a couple days ago and it's already helped me fix a bug that's been on my backlog for weeks, and it was something that only happened on certain mobile devices I don't own to test on. It was a breeze fixing it today. I am definitely purchasing a license now.

Very cool, and very easy to play with in the upcoming Polypane release ;)

Do you use Polypane to check for Accessibility? Jules Ernst maintains an overview of which WCAG SCs Polypane helps with, and he just updated it with all the latest features in Polypane. An invaluable resource, thanks Jules! www.200ok.nl/tips/polypan...

Buy @polypane.app !

I just got Polypane again yesterday, and I am so grateful it exists. Now paid for by Factorial.io so, no more pausing my subscription :) 🙌

Just improved my web dev workflow by getting a @polypane.app subscription! 🥳 🔥 🤩 polypane.app

Any post that starts off with the rule of least power is bound to be a good one. @pawelgrzybek.com shows how you can create custom invoker commands by listening to the command event, greatly simplifying interactivity. For predefined commands you don't even need JS! pawelgrzybek.com/more-invoker...