HTML: the Root Element
What is Root Element
“root element” of HTML is the element represented by the <html></html> tags.
Root element of XML may be other, depending on the XML.
For example, root element of SVG is represented by the
<svg></svg> tags.
[see Practical SVG Tutorial]
Root element of Atom Web Feed is
<feed></feed>.
Why is Root Element Important
It's important because many CSS unit's meaning refers to it.
[see CSS: Units]
CSS Syntax for Root Element
In CSS, the root can be specified by: :root
For example, make all text red:
:root { color: red; }
This is often used when using CSS variables.
[see CSS Variable]