Polypane 30.1 introduces selector specificity highlighting in the elements panel, showing which parts of a CSS selector contribute to its specificity, including for nested selectors. The sources panel gains a toggle to compare server-sent HTML versus rendered HTML for debugging SSR issues, both validated independently. Passkey/WebAuthn support arrives on Linux via 1Password's passkey-rs library, matching existing Windows and Mac support. Other updates include gap values in the Peek tooltip, a scribble-style placeholdifier overlay, WCAG 2.2 target size checks in the accessibility panel, and an upgrade to Chromium 152, plus various fixes.
Table of contents
Selector specificity insightsGap values in Peek tooltipPasskeys support on LinuxServer-sent HTML view in the sources panelUpdated placeholdifier debug overlayChromium 152Get Polypane 30.1Polypane 30 ChangelogQuestions this post answers
What new features are included in Polypane 30.1?
Polypane 30.1 adds selector specificity highlighting in the elements panel, a toggle in the sources panel to switch between server-sent and rendered HTML, and passkey/WebAuthn support on Linux using 1Password's passkey-rs library. It also displays gap values in the Peek tooltip and runs on Chromium 152. Track browser tooling releases like Polypane's alongside the rest of your webdev stack on daily.dev.
How does Polypane highlight CSS selector specificity for nested selectors?
Hovering over a nested CSS selector in Polypane's elements panel highlights the resolved parent selector parts that contribute to specificity, and it correctly treats compound selectors like .card, #highspecificity as counting as a single ID selector even when that ID isn't present in the DOM. Complex wrapped selectors using :is() are drilled down into rather than counted as one value. Developers debugging CSS specificity conflicts can follow tooling updates like this on daily.dev.
How does Polypane implement passkey support on Linux without a platform passkey backend?
Polypane uses software passkeys through 1Password's passkey-rs library on Linux, since unlike Windows and Mac, Linux lacks a native operating-system backend for passkeys/WebAuthn. This required a custom UI in Polypane, but it brings feature parity across Windows, Mac, and Linux for testing passkey implementations. Anyone testing passkey/WebAuthn flows across platforms can track tooling like this on daily.dev.
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