Is it possible to assign a class to :root?

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As I am thinking about solutions to another problem of mine, I am trying to understand to which extend CSS elements can inherit from other elements. Specifically, having the following definition

.dark {
  background-color: black;
}
.light {
  background-color: white
}

is it possible to programmatically assign (with JS, probably) one of these classes to the :root element?

It can be done easily with JS.

  1. Select the element:

    const root = document.querySelector(':root')
    
  2. Assign the class to it:

    root.classList.add('light')
    

All together:

const root = document.querySelector(':root')
root.classList.add('light')

Or, instead of having two classes, it might be better to have a :not() selector:

:root:not(.dark){
  background-color: white;
}
:root.dark{
  background-color: black;
}

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I would use (and have used) CSS variables for this.

:root {
  --background-color: black;
}

.background {
  background-color: var(--background-color);
}

Then change the CSS variable with javascript.

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In HTML, :root is equivalent to <html> (doc):

In HTML, :root represents the element and is identical to the selector html, except that its specificity is higher.

A possible solution would be to apply the class to <html>:

document.getElementsByTagName("html")[0].classList.add('dark')
.dark {
  background-color: red;
}
<html>
hello
</html>

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Sass: @extend, A number of JavaScript root objects are available when you are implementing from JavaScript controllers, this is possible by adding custom JavaScript root objects. Old Java Object) that extends the base class org.alfresco.repo. processor. Create a new branch with the object of class classname at address addobj. WARNING: Starting with Root version 3.01, the Branch function uses the new style branches (TBranchElement). To get the old behaviour, you can: call BranchOld or; call TTree::SetBranchStyle(0) Note that with the new style, classname does not need to derive from TObject.

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Comments
  • Ah this is perfect, thanks. I just posted an idea similar to yours but targeting the html element. Yours is exactly to the point.
  • document.querySelector(':root') can be more simply written as document.documentElement
  • This is actually what I want to avoid - if you could have a look at the question I linked, I want to put the CSS definitions in a CSS file (or <style>) so that I do not have to change them via JS (and keep their definition in JS)