---
title: "How to debug the @starting-style at-rule in Polypane"
url: https://daily.dev/posts/how-to-debug-the-starting-style-at-rule-in-polypane-sruo9fgpl
source_url: https://polypane.app/blog/how-to-debug-the-starting-style-at-rule-in-polypane
type: article
source: "Polypane"
published: 2026-06-28T11:35:29.814Z
updated: 2026-07-02T02:15:50.729Z
tags: ["css", "devtools", "polypane"]
reading_time: 9
upvotes: 0
comments: 0
language: en
---

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# How to debug the @starting-style at-rule in Polypane

**[Polypane](https://daily.dev/sources/polypane)** · 9 min read · 0 upvotes · 0 comments

## Summary

The CSS @starting-style at-rule lets you define the 'from' state for animations when elements are added to the DOM, eliminating the need for JavaScript workarounds. The post explains how @starting-style works, covers specificity gotchas when placing it separately from regular styles, and demonstrates how Polypane's elements panel makes debugging it straightforward by showing all element states (including non-current ones like :hover and @starting-style) simultaneously. This design philosophy — building devtools for web developers rather than browser implementors — is why Polypane supported @starting-style inspection over a year before Chrome DevTools added the feature.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://polypane.app/blog/how-to-debug-the-starting-style-at-rule-in-polypane>

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---

Tags: [#css](https://daily.dev/tags/css), [#devtools](https://daily.dev/tags/devtools), [#polypane](https://daily.dev/tags/polypane)

[View this post on daily.dev](https://daily.dev/posts/how-to-debug-the-starting-style-at-rule-in-polypane-sruo9fgpl)