.firstElementChild

A property containing the first element child of a node - it does not count text nodes. Returns null if no element child nodes are found. This property is read-only - it cannot be set.

let firstEl = node.firstElementChild;

See also: .lastElementChild

Example

HTML:

<p>
    All
    <strong>large</strong>
    goats
    <em>are</em>
    delicious!
</p>

JavaScript:

let first = document.query("p").firstElementChild;

Result is the <strong>large</strong> element.