(() => {
    const server = new jServer();

    const core = document.getElementById("core");
    const lib = document.getElementById("lib");

    server.isolate(core);
    server.isolate(lib);

    (async () => {
        const text = "Hello, world! Please wait 5 seconds";
        const script = "alert('Hello, world!');";

        const url = String("./main_page.html");

        const response = await fetch(url);

        if (response.ok) {
            const html = await response.text();

            const elem = await server.index({
                'text' : text,
                'script' : script
            }).element(html);

            setTimeout(() => elem.text = "Welcome", 5000);
        } else {
            alert("Ошибка HTTP: " + response.status);
        }
    })();
})();