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.
css
/* Selects the root element of the document:
<html> in the case of HTML */
:root {
background: yellow;
}
css
:root {
/* ... */
}
:root can be useful for declaring global CSS variables:
css
:root {
--main-color: hotpink;
--pane-padding: 5px 42px;
}
| Specification |
|---|
| Selectors Level 4 # root-pseudo |
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
:root |
1 | 12 | 1 | 9 | 9.5 | 1 | 37 | 18 | 4 | 14 | 1 | 1.0 |
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https://developer.mozilla.org/en-US/docs/Web/CSS/:root