A general class to use for CEF Windows,

cef.js

class CEFWindow {
    path; local; open; x; y; width; height; browser;
    constructor(resourcePath, local, width, height, x, y) {
        this.path = resourcePath;
        this.local = local;
        this.open = false;
        this.x = x;
        this.y = y;
        this.width = width;
        this.height = height;
    }

    show() {
        if (this.open === false) {
            this.open = true;

            this.browser = API.createCefBrowser(this.width, this.height, this.local);
            API.waitUntilCefBrowserInit(this.browser);
            API.setCefBrowserPosition(this.browser, this.x, this.y);
            API.loadPageCefBrowser(this.browser, this.path);
            API.showCursor(true);
        }
    }

    destroy() {
        this.open = false;
        API.destroyCefBrowser(this.browser);
        API.showCursor(false);
    }

    eval(string) {
        this.browser.eval(string);
    }
}