:root - CSS: Cascading Style Sheets 编辑
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 is higher.
/* Selects the root element of the document:
<html> in the case of HTML */
:root {
background: yellow;
}Syntax
:root
Examples
Declaring global CSS variables
:root can be useful for declaring global CSS variables:
:root {
--main-color: hotpink;
--pane-padding: 5px 42px;
}
Specifications
| Specification | Status | Comment |
|---|---|---|
| Selectors Level 4 The definition of ':root' in that specification. | Working Draft | No change. |
| Selectors Level 3 The definition of ':root' in that specification. | Recommendation | Initial definition. |
Browser compatibility
BCD tables only load in the browser
See also
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