![Understanding CSS Variables. CSS variables, or “CSS Custom… | by Nirazan Basnet | YoungInnovations' Blog Understanding CSS Variables. CSS variables, or “CSS Custom… | by Nirazan Basnet | YoungInnovations' Blog](https://miro.medium.com/v2/resize:fit:1200/1*IwcCJxD9AWJ_oTGsHqHQKg.jpeg)
Understanding CSS Variables. CSS variables, or “CSS Custom… | by Nirazan Basnet | YoungInnovations' Blog
![Stefan Judis on X: "I just came across a little CSS custom properties trick I never thought of. You can use undefined properties with a fallback value to then define them later. Stefan Judis on X: "I just came across a little CSS custom properties trick I never thought of. You can use undefined properties with a fallback value to then define them later.](https://pbs.twimg.com/ext_tw_video_thumb/1222986959586570243/pu/img/CFJ6TprE_B1zDtJP.jpg:large)
Stefan Judis on X: "I just came across a little CSS custom properties trick I never thought of. You can use undefined properties with a fallback value to then define them later.
CSS variable (custom property) with fallback as nothing compiles to no fallback · Issue #3245 · sass/sass · GitHub
![Fallback for css variables doesn't seem to be replaced correctly in combination with logical properties · Issue #619 · csstools/postcss-plugins · GitHub Fallback for css variables doesn't seem to be replaced correctly in combination with logical properties · Issue #619 · csstools/postcss-plugins · GitHub](https://user-images.githubusercontent.com/25054095/189829729-874f7184-b688-4d07-98b8-293d921de6eb.png)