The :root CSS pseudo-class matches the root element of a tree representing the document. Applied to HTML, :root represents the <html> element and is identical to the selector html, except that its specificity is higher.
:root { style properties } Using :root can be useful to declare global CSS Variables:
:root {
--main-color: hotpink;
--pane-padding: 5px 42px;
}
| 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 |
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
| Basic support | 1 | 1.0 (1.7 or earlier) | 9 | 9.5 | 1.0 |
| Feature | Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|
| Basic support | ? | ? | ? | ? | ? |
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https://developer.mozilla.org/en-US/docs/Web/CSS/:root