TreeWalker: firstChild() method

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

The TreeWalker.firstChild() method moves the current Node to the first visible child of the current node, and returns the found child. If no such child exists, it returns null and the current node is not changed.

Syntax

js
firstChild()

Parameters

None.

Return value

A Node object or null.

Examples

js
const treeWalker = document.createTreeWalker(
  document.body,
  NodeFilter.SHOW_ELEMENT,
  {
    acceptNode(node) {
      return NodeFilter.FILTER_ACCEPT;
    },
  },
  false,
);
const node = treeWalker.firstChild(); // returns the first child of the root element, or null if none

Specifications

Specification
DOM Standard
# dom-treewalker-firstchild

Browser compatibility

BCD tables only load in the browser

See also