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Polypane. Browser for web devs @polypane.app · 9h

Did you try our new flex item visualizer yet? Shipped in Polypane 31

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Craig Roblewsky @pointc.bsky.social · 29/09/2026

Seriously, if you're not using Polypane for development, you're missing out. Highly recommended.

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Polypane. Browser for web devs @polypane.app · 29/09/2026

Polypane 31 is here and ...it has a boatload of cool new features! 🖼️ Canvas layout with free-form placement ↔️ Flex item inspector 🎯 Navigate to custom properties ...and back! 🔍 Per-pane zoom settings 🏎️ Page performance monitoring 📱new iPhone 18 and duo presets polypane.app/blog/polypan...

polypane.app

Polypane 31: Canvas layout, elements panel improvements and Chromium 155 | Polypane

This release has a new canvas layout that lets you freely arrange panes on an infinite canvas. The elements panel now lets you filter styles, search the DOM…

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Kilian Valkhof @kilianvalkhof.com · 29/09/2026

Working on an infinite canvas is just so, so smooth.

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Polypane. Browser for web devs @polypane.app · 29/09/2026

polypane.app

Polypane 31: Canvas layout, elements panel improvements and Chromium 155 | Polypane

This release has a new canvas layout that lets you freely arrange panes on an infinite canvas. The elements panel now lets you filter styles, search the DOM…

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Polypane. Browser for web devs @polypane.app · 25/09/2026

Go to definition for CSS custom properties is pretty nice. Finding your way back with a single click, that's even nicer.

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Polypane. Browser for web devs @polypane.app · 25/09/2026

Go to definition for CSS custom properties is pretty nice. Finding your way back with a single click, that's even nicer.

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Polypane. Browser for web devs @polypane.app · 23/09/2026

The root scroller in your browser (the one scrolling the viewport) is special, but it's really easy to accidentally create a new scroll container. Learn how those nested scroll containers break scroll restoration, mobile browser UI and more, plus how to avoid them.

polypane.app

The root scroller and how not to lose it | Polypane

Every page has one main scroll container that scrolls the page itself: the root scroll container, or root scroller for short. Because it scrolls the entire page…

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Polypane. Browser for web devs @polypane.app · 23/09/2026

polypane.app

The root scroller and how not to lose it | Polypane

Every page has one main scroll container that scrolls the page itself: the root scroll container, or root scroller for short. Because it scrolls the entire page…

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Kilian Valkhof @kilianvalkhof.com · 22/09/2026

I've been debugging sites using different scroll containers at different viewports widths and thinking of ways to make it clearer what's happening, rather than people thinking the sync in Polypane doesn't work. The first change is in: highlighting the scroll badge of whatever is being scrolled.

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Polypane. Browser for web devs @polypane.app · 21/09/2026

This is Polypane. www.youtube.com/watch?v=uGr-...

youtube.com

Polypane, the browser for web developers

YouTube video by Polypane

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Kilian Valkhof @kilianvalkhof.com · 21/09/2026

There's apparently a thing about Cloudflare's tunnel... So a reminder that @polypane.app has that feature built-in. Single click, network or public URL, short-lived unique non-indexed URL. Everything is synced to all devices, all console messages are sent back to the console. polypane.app/portal/

polypane.app

Polypane Portal | Polypane

Polypane Portal shares your local development environment with anyone, anywhere, on any device while keeping everything in sync.

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Polypane. Browser for web devs @polypane.app · 04/09/2026

Pssst 🤫 We're working on an infinite canvas. What do you think?

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Polypane. Browser for web devs @polypane.app · 04/09/2026

Pssst 🤫 We're working on an infinite canvas. What do you think?

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Polypane. Browser for web devs @polypane.app · 02/09/2026

Polypane gives you more feedback and suggestions than any other tool because all those details matter. And soon, it will show you one less.

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Polypane. Browser for web devs @polypane.app · 02/09/2026

Polypane gives you more feedback and suggestions than any other tool because all those details matter. And soon, it will show you one less.

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Polypane. Browser for web devs @polypane.app · 28/08/2026

Our source panel can now toggle between the rendered and the server-sent HTML! Both are automatically formatted, both are validated. If you're not sure if an HTML issue starts on the server or in your JS, that's now super easy to find.

The Polypane Source panel with a new "rendered"/"server" toggle. The validation says"Congratulations, this server HTML is valid!"

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Polypane. Browser for web devs @polypane.app · 31/08/2026

if you missed it last friday, we have a new version out! 🥳

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Polypane. Browser for web devs @polypane.app · 28/08/2026

Our elements panel got an exciting addition. Hover over the specificity of a selector to see each part of it highlighted, so you know exactly what's responsible. Intelligent enough to drill down into nested `:is()` selectors, intelligent enough to drill up into nested selectors.

A complex selector with a highlighted specificity. Several part of the text are underlined and highlighted with different styles.

A neste selector with a highlighted specificity. Several part of the text are underlined and highlighted with different styles.

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Kilian Valkhof @kilianvalkhof.com · 28/08/2026

Well this is just cool! It even has the invisible cone between an item and its submenu so it doesn't close as you move diagonally. Video made in @polypane.app BTW :)

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Polypane. Browser for web devs @polypane.app · 26/08/2026

We've given our online CSS selector specificity calculator some nice upgrades! - Improved resolution of function nested specificity - Highlighting parts while you type (using OpagueRange + Highlight API) - Explore your selector by hovering over each part Check it out: polypane.app/css-specific...

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Polypane. Browser for web devs @polypane.app · 26/08/2026

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Polypane. Browser for web devs @polypane.app · 19/08/2026

Polypane 30 is out! 🤩 🛝 Playgrounds: go from .html to multi-device testing in 3 clicks 🔤 text-scale emulation 📹 recording w/ sound 🌐 Network panel filtering & sorting ✨ Sidepanel browser extensions 🔗 Standard.site validation & previews 🌍 Chromium 152 ⛰️ MORE STILL polypane.app/blog/polypan...

polypane.app

Polypane 30: Playgrounds, Side Panel extension API, updated video recording and Chromium 152 | Polypane

Polypane 30 introduces Playgrounds so you can open directories as real HTTPS URLs in seconds, adds support for the Side Panel extension API, brings major…

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Polypane. Browser for web devs @polypane.app · 20/08/2026

Check out our newest testimonial by @pointc.bsky.social 🤩 See all our latest testimonials here: polypane.app/testimonials/

Shout-out to Polypane. I've been working on a website with a fairly complex layout and I can't image [sic] developing anything without it.

Too many features to list. Just try it. You'll love it.

Craig Roblewsky
Cofounder Sleepy Dog Media Group

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Vale @vale.rocks · 19/08/2026

Woah. Huge Polypane update.

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Paul van Buuren 🍉‬ 🇪🇺🇳🇱 @paulvanbuuren.nl · 19/08/2026

The best browser for developers is made by @kilianvalkhof.com.

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Matija Marohnić @silvenon.com · 19/08/2026

Polypane v30 ✨ Network panel got more stable and insightful — see requests alone or grouped by origins, both very useful depending on your optimization angle. Emulating svh overlay is now on by default — always see what’s ACTUALLY above the fold on mobile. Fast startup 💨 Check out the changelog.

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Kilian Valkhof @kilianvalkhof.com · 20/08/2026

Anything random is a joy to test in @polypane.app by the way, because you really get a feel for how it behaves.

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Polypane. Browser for web devs @polypane.app · 19/08/2026

polypane.app

Polypane 30: Playgrounds, Side Panel extension API, updated video recording and Chromium 152 | Polypane

Polypane 30 introduces Playgrounds so you can open directories as real HTTPS URLs in seconds, adds support for the Side Panel extension API, brings major…

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Paul van Buuren 🍉‬ 🇪🇺🇳🇱 @paulvanbuuren.nl · 07/08/2026

@handle.invalid says @polypane.app is useful for accessibility nerds, so it must be true: www.200ok.nl/tips/polypan...

200ok.nl

Polypane and WCAG - 200 OK - Jules Ernst

Jules Ernst, onafhankelijk webadviseur

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Web Standards @web-standards.dev · 31/07/2026

Cheatsheets for flex, grid, anchor positioning and invoker commands. Kilian Valkhof shares four CSS references he made after forgetting anchor positioning and grid-area syntax. Free as PDF and PNG in print-ready A5. #css #learn polypane.app/blog/ch...

Title “Cheatsheets for flex, grid, anchor positioning and invoker commands” and four overlapping Polypane cheatsheet cards: CSS Flexbox, CSS Grid, Anchor Positioning, and Invoker Commands.

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Polypane. Browser for web devs @polypane.app · 27/07/2026

Remember these? Well, we made them available online using some fun CSS transitions, and we made them available as free print-ready downloads too! Go play with them here: polypane.app/cheatsheets/

polypane.app

Cheatsheets | Polypane

A collection of handy sheets for web devs, covering CSS Flexbox, CSS Grid, Anchor Positioning, and Invoker Commands.

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Kilian Valkhof @kilianvalkhof.com · 24/07/2026

Fix contrast automatically makes text readable on sites that have low-contrast text. I've updated it to use a much faster algorithm to go over all contrast pairs, and it's now instant even on large websites. Download for Chrome, Firefox, Edge, Vivaldi, Opera etc: fixa11y.com

fixa11y.com

FixA11y — improving accessibility

The FixA11y project improves accessibility through smart technology and education.

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Polypane. Browser for web devs @polypane.app · 21/07/2026

Our helper extension got a new update, adding even more options to help move your workflow over to Polypane. Configure any domain to get a button, full page overlay or let it automatically forward pages to Polypane. Available for all the browsers. Links here: polypane.app/docs/helper-...

"Overlay behavior. The helper adds a button to local URLs. You can configure additional rules for specific domains."

What follows is three images showing the button, overlay and auto-open styles along with instructions.

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Polypane. Browser for web devs @polypane.app · 20/07/2026

Polypane's snippets store has dozens of snippets that add new functionality to Polypane that you can install with a single click. Browse the collection here polypane.app/snippets/

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Polypane. Browser for web devs @polypane.app · 20/07/2026

Polypane's snippets store has dozens of snippets that add new functionality to Polypane that you can install with a single click. Browse the collection here polypane.app/snippets/

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Polypane. Browser for web devs @polypane.app · 14/07/2026

we're waiting for a fix to Electron to land before we can release the next version but in the mean time we're just building new features. This morning we added support for all the chrome.tabCapture extension APIs, which should bring in support for a whole new range of extensions.

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Polypane. Browser for web devs @polypane.app · 08/07/2026

Guess which browser went 29 major versions without having a directory listing feature... Well, not anymore, the upcoming version of Polypane now has a beautiful directory listing! It's fast, responsive, easy to navigate, and part of an exciting new feature we're keeping under wraps for now.

Polypane showing a directory listing page across three panes

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Kilian Valkhof @kilianvalkhof.com · 26/06/2026

Works best shown in @polypane.app :)

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Kilian Valkhof @kilianvalkhof.com · 25/06/2026

Field sizing just works, now everywhere :D

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Polypane. Browser for web devs @polypane.app · 24/06/2026

We've been experimenting with CSS´s upcoming Random() function to see what it can do. In the mean time we found a few browser crashes and a way to implement random-item() before it actually lands. Best viewed in Polypane 29+ (For now!) polypane.app/blog/experim...

polypane.app

Experimenting with random() in CSS | Polypane

CSS is getting a random() function that lets you set properties with a random value, letting you make interesting and creative new designs. It's available in…

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