docx-js/src/file/document/body/page-margin.ts

import { Attributes, XmlComponent } from "file/xml-components";

export class PageMargin extends XmlComponent {
    constructor() {
        super("w:pgMar");
        this.root.push(
            new Attributes({
                top: "1440",
                right: "1440",
                bottom: "1440",
                left: "1440",
                header: "708",
                footer: "708",
                gutter: "0",
            }),
        );
    }
}