davatron5000/deCSS3: deCSS3 Bookmarklet: Test CSS3 Graceful
A bookmarklet to strip CSS3 rules and check graceful degradation.
★ 4.0 / 5 iKeep scoreScreenshots
Quick facts
Overview
deCSS3 is a bookmarklet that allows developers to test how well their web pages degrade gracefully by stripping out CSS3 rules. It helps ensure compatibility with older browsers like IE6-8 without needing to open them.
Getting started with GitHub - davatron5000/deCSS3: A lil’ bookmarklet that will strip out your CSS3 rules and show you how gracefully you’re degrading
- Visit GitHub repositoryGo to the official GitHub repository at https://github.com/davatron5000/deCSS3 to access the deCSS3 bookmarklet.
- Drag bookmarklet to bookmarks barDrag the provided bookmarklet link to your browser's bookmarks bar for easy access.
- Navigate to your web pageOpen the web page you want to test in your browser.
- Click the bookmarkletClick the deCSS3 bookmarklet to strip CSS3 rules and test graceful degradation.
Pricing
| Plan | Price | Note |
|---|---|---|
| Open-source | Free | No cost for usage |
💡 Indicative pricing — check the official rates at github.com · Updated 7/27/2026
Original pricing screenshotKey features
- Strips CSS3 rules to test graceful degradation
- Supports a wide range of CSS3 properties
- Cloud-based feature roadmap matrix
- Easy to use with a simple bookmarklet
Pros
- Simplifies testing for older browser compatibility
- Supports most CSS3 properties
- Open-source and free to use
Cons
- Limited support for some CSS3 features like multiple backgrounds
- Requires manual intervention to test degradation
Use cases
- Testing web page compatibility with older browsers
- Ensuring graceful degradation of CSS3 features
- Simplifying CSS3 debugging and optimization
The verdict
deCSS3 is a valuable tool for web developers focused on ensuring their CSS3 implementations degrade gracefully in older browsers, though it has some limitations.
✓ Who should use it
Web developers who need to ensure their CSS3 designs work well in older browsers.
✕ Who should skip it
Developers who only target modern browsers and don't need backward compatibility.
Categories
Community
- GitHub Issues ↗Report bugs and suggest improvements for deCSS3
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Frequently asked questions
Is GitHub - davatron5000/deCSS3: A lil’ bookmarklet that will strip out your CSS3 rules and show you how gracefully you’re degrading free?
GitHub - davatron5000/deCSS3: A lil’ bookmarklet that will strip out your CSS3 rules and show you how gracefully you’re degrading is free to use.
What is GitHub - davatron5000/deCSS3: A lil’ bookmarklet that will strip out your CSS3 rules and show you how gracefully you’re degrading best for?
Web developers ensuring backward compatibility
Does GitHub - davatron5000/deCSS3: A lil’ bookmarklet that will strip out your CSS3 rules and show you how gracefully you’re degrading have an API?
No, GitHub - davatron5000/deCSS3: A lil’ bookmarklet that will strip out your CSS3 rules and show you how gracefully you’re degrading does not offer a public API.
Can I self-host GitHub - davatron5000/deCSS3: A lil’ bookmarklet that will strip out your CSS3 rules and show you how gracefully you’re degrading?
Yes, GitHub - davatron5000/deCSS3: A lil’ bookmarklet that will strip out your CSS3 rules and show you how gracefully you’re degrading can be self-hosted.
Who should use GitHub - davatron5000/deCSS3: A lil’ bookmarklet that will strip out your CSS3 rules and show you how gracefully you’re degrading?
Web developers who need to ensure their CSS3 designs work well in older browsers.
Reviews 4.0 ★ · 1 review
deCSS3 is a practical and efficient tool for web developers who need to ensure their CSS3 implementations degrade gracefully in older browsers. Its bookmarklet format makes it easy to use, and the cloud-based feature roadmap provides a clear view of supported CSS3 properties. While it has some limitations, such as incomplete support for certain features, it remains a valuable resource for developers focused on backward compatibility. The open-source nature of the tool also means it's free to use and can be customized to fit specific needs.
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