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use graffiti::gfx::{GlBackend, RenderBackend};use graffiti::{App, Document, Viewport, Window};use std::cell::RefCell;use std::rc::Rc;
fn main() {    let app = unsafe { App::init() };    let mut win = Window::new(&app, "Hello", 1024, 768);    let mut viewport = Viewport::new(win.size(), &Rc::new(RefCell::new(Document::new())));    let mut backend = unsafe { GlBackend::new(|s| win.get_proc_address(s) as _) };
    let mut doc = viewport.document().borrow_mut();    let root = doc.root();    let h1 = doc.create_element("h1");    let hello = doc.create_text_node("Hello");    doc.insert_child(h1, hello, 0);    doc.insert_child(root, h1, 0);    drop(doc);
    while !win.should_close() {        for e in win.events().try_iter() {            viewport                .document()                .borrow_mut()                .set_cdata(hello, &format!("Hello {:#?}", e));        }
        backend.render_frame(viewport.render());
        win.swap_buffers();        app.wait_events();    }}