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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

Example

: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

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
Basic supportChrome Full support 1Edge ? Firefox Full support 1IE Full support 9Opera Full support 9.5Safari Full support 1WebView Android ? Chrome Android ? Edge Mobile Full support YesFirefox Android ? Opera Android ? Safari iOS ? Samsung Internet Android ?

Legend

Full support  
Full support
Compatibility unknown  
Compatibility unknown

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