In a HTML document, the pseudo class :root always refers to the <html> element. code example

Example: :root css

/* Selects the root element of the document:
   <html> in the case of HTML
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.

*/
:root {
  background: yellow;
}

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