:root CSS pseudo-class
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The :root CSS pseudo-class matches the root element of a tree representing the document. In HTML, :root represents the <html> element and is identical to the selector html, except that its specificity (0-1-0) is higher than html's (0-0-1).
css
/* Selects the root element of the document:
<html> in the case of HTML */
:root {
background: yellow;
}
Syntax
css
:root {
/* ... */
}
Examples
Declaring global CSS variables
:root can be useful for declaring global CSS variables:
css
:root {
--main-color: hotpink;
--pane-padding: 5px 42px;
}
Specifications
| Specification |
|---|
| Selectors Level 4 # root-pseudo |
Browser compatibility
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:root
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Legend
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- Full support
- Full support