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;
} :root
:root can be useful for declaring 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. |
| Desktop | ||||||
|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | |
| Basic support | 1 | ? | 1 | 9 | 9.5 | 1 |
| Mobile | |||||||
|---|---|---|---|---|---|---|---|
| Android webview | Chrome for Android | Edge Mobile | Firefox for Android | Opera for Android | iOS Safari | Samsung Internet | |
| Basic support | ? | ? | Yes | ? | ? | ? | ? |
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https://developer.mozilla.org/en-US/docs/Web/CSS/:root