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Document.documentElement - Web APIs 编辑

Document.documentElement returns the Element that is the root element of the document (for example, the <html> element for HTML documents).

Syntax

const element = document.documentElement

Example

const rootElement = document.documentElement;
const firstTier = rootElement.childNodes;
// firstTier is a NodeList of the direct children of the root element
// such as <head> and <body>

for (const child of firstTier) {
   // do something with each direct child of the root element
}

For any non-empty HTML document, documentElement will always be an <html> element. For any non-empty XML document, documentElement will always be whatever element is the root element of the document.