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:


All together:

const root = document.querySelector(':root')

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

  background-color: white;
  background-color: black;

17 Adding a Class, Hello all, I am trying to add a class to get Root functionalities but I am and exhausted internet search resources without being able to solve my� Question: PLEASE EXPLAIN AS SOON AS POSSIBLE IN JAVA. Public Class Assignment3 { Public Static Queue MakeQueue(double[] A){ // Each Element Of The Given Array A Must Be Inserted Into A BTNode, // This Method Returns A Queue Of BTNodes, Each Node Will Contain A DataNode // The DataNode Will Have The Value Equal To The Element Of The Array // Count

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.

Adding Class to Root inside namespace - ROOT, The :root CSS pseudo-class matches the root element of a tree representing the document. In HTML, :root represents the html element and is� The EventHeader class (also defined in Event.h) does not inherit from TObject. Beginning with ROOT 3.0, an object can be placed on a branch even though it does not inherit from TObject. In previous releases branches were restricted to objects inheriting from the TObject.

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>:

.dark {
  background-color: red;

:root, When one class extends another, Sass styles all elements that match the It trims redundant selectors as much as possible, while still ensuring that the� Class to Wrap a ROOT Function class (like TF1) in a IParamFunction interface of one dimensions to be used in the ROOT::Math numerical algorithms The wrapper does not own bby default the TF1 pointer, so it assumes it exists during the wrapper lifetime

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.

JavaScript Root Objects, Nor can we assign the root user to a custom class: # set system login user root class root # commit error: cannot create user account: root error: user name is used by a system account error: commit failed: daemon file propagation failed

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  • 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)