Polypane Blog
https://polypane.app
See every screen, device & user preference in sync while you build. Plus all the tools to ship responsive, fast, accessible and SEO-friendly sites.
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Polypane 31: Canvas layout, elements panel improvements and Chromium 155
Polypane Blog
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…
2ヶ月前
The root scroller and how not to lose it
Polypane Blog
Every page has one main scroll container that scrolls the page itself: the root scroll container, or root scroller for short. Because it…
2ヶ月前
Polypane 30.1: Selector specificity insights, server HTML validation, and more
Polypane Blog
Polypane 30.1 adds selector specificity highlighting to the elements panel, a new server-sent HTML view in the sources panel, passkey…
3ヶ月前
Polypane 30: Playgrounds, Side Panel extension API, updated video recording and Chromium 152
Polypane Blog
Polypane 30 introduces Playgrounds so you can open directories as real HTTPS URLs in seconds, adds support for the Side Panel extension API…
3ヶ月前
Cheatsheets for flex, grid, anchor positioning and invoker commands
Polypane Blog
For CSS Day this year we created a set of cheatsheets explaining Flexbox, Grid, Anchor positioning and Invoker commands. They came out…
4ヶ月前
Experimenting with the new pure CSS random() function
Polypane Blog
CSS is getting a random() function that lets you set properties with a random value, opening up a ton of interesting creative…
5ヶ月前
Using safe-area-inset to build mobile-safe layouts
Polypane Blog
Modern phones are not simple rectangles. They have rounded corners, camera cutouts, dynamic islands, and home indicators that double as…
6ヶ月前
Polypane 29: New network panel, snippet store and Chromium 148
Polypane Blog
Polypane 29 introduces an updated panel UI, a new network panel for inspecting requests, a new snippet store for discovering and installing…
6ヶ月前
The Intl API: The best browser API you're not using
Polypane Blog
Chances are you've used Moment.js , date-fns , Luxon , or numeral.js at some point. Developers have relied on these libraries for years…
7ヶ月前
How to debug the @starting-style at-rule in Polypane
Polypane Blog
The @starting-style at-rule makes it possible to animate in elements as you add them to the DOM, something that previously needed…
9ヶ月前
Polypane 28: Project improvements, Elements panel updates and Chromium 146
Polypane Blog
The first release of 2026 comes with plenty of improvements to Projects, the new Environments feature prevents you from confusing production…
9ヶ月前
Understanding the fundamentals of CSS Layout
Polypane Blog
When developers say that CSS is hard, they're usually talking about CSS layout. What often gets omitted though is that developers are…
10ヶ月前
Not All Browser APIs Are "Web" APIs
Polypane Blog
When we talk about "the web platform", we often treat it as a unified, standards-based system: browsers implement features from the same…
10ヶ月前
Polypane 27.1: Expanding Portal
Polypane Blog
Polypane 27.1 is here and Polypane Portal has expanded! The Polypane console will now show the console messages from all connected browsers…
1年前
Polypane 27: Projects, a Snippets Panel and Chromium 142
Polypane Blog
Polypane 27 is out! This release brings a new project-focused workflow, a new snippets panel, improved DOM editing and is built on Chromium…
1年前
Using chrome-devtools-mcp with Polypane
Polypane Blog
The recently released chrome-devtools-mcp allows you to connect your coding agent (like GitHub Copilot) to a running Chromium instance to…
1年前
Polypane 26: Accurate device emulation with safe area and small viewport units
Polypane Blog
Polypane 26 brings the most accurate device emulation available anywhere. We now emulate small viewport units (svh) and device-specific safe…
1年前
CSS-only floating focus with anchor positioning
Polypane Blog
The Track focus debug tool in Polypane shows a floating outline that follows the keyboard focus around the page. This makes it easier to…
1年前
Polypane with Stefan Judis
Polypane Blog
I recently joined Stefan Judis for a Polypane walkthrough/demo over on his YouTube channel. We touched on how I came to develop Polypane…
1年前
Polypane 25.1: DRM support and bug fixes
Polypane Blog
Polypane 25.1 is now available, and it brings DRM support through Widevine, a new reopen last closed tab feature and a number of…
1年前