How to create a theme switcher with HTML & CSS
A few custom properties and the :has() selector make color theming super easy to do! Add in a bit of JS and we can save the user’s preferences in localStorage, and we’re good to go!
Of course, :has() support isn’t perfect, but we can build in a quick fallback with just a little bit more JS.
🔗 Links
✅ The code from this video: https://codepen.io/kevinpowell/pen/MWXybWJ
✅ More on visually-hidden: https://www.scottohara.me/blog/2017/04/14/inclusively-hidden.html
✅ Current support for :has() - https://caniuse.com/?search=%3Ahas()
⌚ Timestamps
00:00 - Introduction
00:57 - What we’re starting…
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Chapters (10)
Introduction
0:57
What we’re starting with
1:58
Setting up the color theme selector
4:04
Hiding the labels
5:39
Styling the color theme picker
12:05
Adding functionality with :has()
13:48
Using localStorage to remember the users choice
23:52
Adding a fallback for when there is no :has() support
24:54
I should have made separate selectors here, as this won't work in Firefox - see
27:20
Because I moved this here, the theme should have been changed to activeTheme - s
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