![Basic CSS challenge “Improve Compatibility with Browser Fallbacks“ not showing on timeline when completed · Issue #18166 · freeCodeCamp/freeCodeCamp · GitHub Basic CSS challenge “Improve Compatibility with Browser Fallbacks“ not showing on timeline when completed · Issue #18166 · freeCodeCamp/freeCodeCamp · GitHub](https://user-images.githubusercontent.com/25120737/45926723-ebc0b800-bf1e-11e8-974c-248f79c9ef8e.png)
Basic CSS challenge “Improve Compatibility with Browser Fallbacks“ not showing on timeline when completed · Issue #18166 · freeCodeCamp/freeCodeCamp · GitHub
![Basic CSS challenge “Improve Compatibility with Browser Fallbacks“ not showing on timeline when completed · Issue #18166 · freeCodeCamp/freeCodeCamp · GitHub Basic CSS challenge “Improve Compatibility with Browser Fallbacks“ not showing on timeline when completed · Issue #18166 · freeCodeCamp/freeCodeCamp · GitHub](https://user-images.githubusercontent.com/25120737/45926724-ebc0b800-bf1e-11e8-8e87-c80700d7a698.png)
Basic CSS challenge “Improve Compatibility with Browser Fallbacks“ not showing on timeline when completed · Issue #18166 · freeCodeCamp/freeCodeCamp · GitHub
![Your .red-box rule should include a fallback with the background set to red immediately before the existing background declaration. · Issue #18231 · freeCodeCamp/freeCodeCamp · GitHub Your .red-box rule should include a fallback with the background set to red immediately before the existing background declaration. · Issue #18231 · freeCodeCamp/freeCodeCamp · GitHub](https://user-images.githubusercontent.com/27268962/46475633-ab591800-c803-11e8-9d07-fdb474a49c65.png)
Your .red-box rule should include a fallback with the background set to red immediately before the existing background declaration. · Issue #18231 · freeCodeCamp/freeCodeCamp · GitHub
![Basic CSS: Improve Compatibility with Browser Fallbacks tests fail on Firefox latest version - HTML-CSS - The freeCodeCamp Forum Basic CSS: Improve Compatibility with Browser Fallbacks tests fail on Firefox latest version - HTML-CSS - The freeCodeCamp Forum](https://i.imgur.com/eWE1op7.png)
Basic CSS: Improve Compatibility with Browser Fallbacks tests fail on Firefox latest version - HTML-CSS - The freeCodeCamp Forum
![Duke_Grant on Twitter: "While completing the "Basic #CSS: Improve # Compatibility with Browser Fallbacks" tutorial on @freeCodeCamp, I thought about the fact that if you care about IE compatibility you won't use CSS # Duke_Grant on Twitter: "While completing the "Basic #CSS: Improve # Compatibility with Browser Fallbacks" tutorial on @freeCodeCamp, I thought about the fact that if you care about IE compatibility you won't use CSS #](https://pbs.twimg.com/media/EfjXA2xWkCAL1zz.jpg)