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:root This CSS pseudo-class matches the root element of the document tree. For HTML, :root represents the <html> element, except for higher priority, it is the same as the html selector.
Complete CSS Selector Reference Manual
Set the background color of the HTML document:
!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Basic Tutorial(oldtoolbag.com)</title>
<style>
:root
{
background:green;
color:#fff;
}
</style>
</head>
<body>
<p>First paragraph.</p>
<p>Second paragraph.</p>
<p>Third paragraph.</p>
</body>
</html>Test to see ‹/›:root
The :root selector matches the root element of the document.
The root element in HTML is always an HTML element.The numbers in the table indicate the first browser version that supports the attribute.
| Selector | |||||
|---|---|---|---|---|---|
| :root | 4.0 | 9.0 | 3.5 | 3.2 | 9.6 |