HTML: the Root Element

What is Root Element

Root element of HTML is the element represented by the html tag.

Root element of SVG is represented by the svg tag. [see Practical SVG Tutorial]

Root element of Atom Webfeed is feed.

Root element of XML may be other, depending on the XML.

Why is Root Element Important

It's important because many CSS's meaning refers to it.

For example:

• Length unit rem refers to root element.
• position: absolute refers to root element.

• CSS: Length Units
• CSS: Position Absolute