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 Part 1
Part 2
Part 3
PostCSS Custom Properties
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