Hasty Treat - Uses for CSS Variables
In this Hasty Treat, Scott and Wes talk about CSS variables, a.k.a CSS Custom Properties - why you might want to use them, why they’re better than various preprocessor’s variables, and pitfalls to watch out for and avoid.
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Show Notes
3:25 - What
-
--example-name, represent custom properties -
called using
var() -
Overwrite with a more specific style
-
Use JavaScript to append .style.setPropert(
-
How are they scoped?
- Just like normal CSS
- Can be set on :root {}
- Can be set on any element down
9:10 - Why
-
Uses:
- Can make more sense if used semantically
- var(–accent) vs var(–yellow)
-
Independent values for things that can’t be broken up:
- box-shadow: 2px 2px 2px 2px red
- transform: rotate(var(–rotate)) scale(2);
-
Inline properties can be picked up by regular CSS (color, size, etc.)
hey
-
Themes that can easily be changed at runtime for entire app
19:15 - Calculations
- You can use them inside of calc()
- Animations
20:10 - Bummers
- Not super well supported just yet (IE 11)
- No good fallback other than manual fallback
- Syntax - Old Browsers, Fallbacks and Polyfills series
- PostCSS Custom Properties
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