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Don't miss out on css variables

Tim Deschryver on July 01, 2019

At first when I heard of css variables when it was introduced, I was a bit skeptical. Why would anyone use it if there are extension languages as s...
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Ben Halpern

Without CSS variables, DEV probably wouldn’t have themes, and some folks really like their dark mode πŸ˜„

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Tim Deschryver • Edited

And we thank you and the whole team for these awesome themes 🀩

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Cosmas Gikunju

There's dark mode? been here since January and never noticed it πŸ˜‚πŸ˜‚πŸ˜‚. just found it pretty deep in settings, would be nice to have a toggle where its better accessible.

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STEN

Where can I toggle the dark mode? I can't find that option(I'm using the PWA version of DEV on my phone).

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Eugene Karataev

Settings -> misc -> style customization

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STEN

That's dope!

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Tobias Buschor

I made a polyfill to target IE11
Maybe someone can use it:
github.com/nuxodin/ie11CustomPrope...

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Tim Deschryver

Awesome work Tobias! πŸ‘Œ

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Dor Shinar

Great article, definitely learned something new here. I'm still not convinced though - how are variables transferred from one stylesheet to another? Say I scope my CSS for individual components (like in react), does it offer seamless integration like other tools already available?
If I have to edit the styles from JS whenever an event fires, why not go full blown CSS-IN-JS?

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Tim Deschryver

I'm afraid that I'm not the best to answer these questions, as I'm not really familiar with react and css-in-js.

But you can override css variables from another stylesheet in your own stylesheet, which could be useful.

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Timothy Foster

Oh my goodness, I hadn't realized you can access these variables with JS. Thanks for sharing!

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Tim Deschryver

When I encountered it I had the urge to write about it πŸ™‚
I'm glad that this post was useful!

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Andrew Evans

This is so cool!

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2pi.pl

From my point of view it's useless as long as IE11 is still used :(

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Caleb Adepitan

It's nice to use it. But I think browser support is still an issue.

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Tim Deschryver

Zero IE support, for the rest it's looking good - caniuse.com/#feat=css-variables

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Frederik Vantroys

Very nice article. Tnx Tim ... Javascript API was new to me too ...

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Tim Deschryver

Thanks Frederik, I'm glad you like it 😊

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Theo M. • Edited

My life just changed reading this! Eye opening! I always wondered how to do themes? This answers my questions for sure! And JS API on top of it... I am blown away!

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Tim Deschryver

Those were exactly my thoughts Theo!
I'm glad you learned something new out of this post 😊

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Mark Magyarodi

css variables are an excellent feature, but the selectbox example isn't the most useful use case IMHO... one can set those css attributes directly.

 
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Tim Deschryver

That's a great tip, thanks for sharing!

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2pi.pl • Edited

Unfortunately about 8% of the web users are still using IE11 and other browsers not supporting css vars. It depends on your company's policy if you need to take care about those users or not - we have to :(
Of course - it's good to know about "new" things but using them it's unfortunately other thing.
This fallback is good for simple cases, but if you'd like to change the value of the --background-color using javascript, simply changing the --background-color variable the colors won't change it in IE.