web-sys 0.3.23

Bindings for all Web APIs, a procedurally generated crate from WebIDL
Documentation 
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use futures::future::Future;
use js_sys::{Object, Promise};
use wasm_bindgen::prelude::*;
use wasm_bindgen::JsCast;
use wasm_bindgen_futures::JsFuture;
use wasm_bindgen_test::*;
use web_sys::Event;

#[wasm_bindgen(module = "/tests/wasm/event.js")]
extern "C" {
    fn new_event() -> Promise;
}

#[wasm_bindgen_test(async)]
fn event() -> impl Future<Item = (), Error = JsValue> {
    JsFuture::from(new_event()).map(Event::from).map(|event| {
        // All DOM interfaces should inherit from `Object`.
        assert!(event.is_instance_of::<Object>());
        let _: &Object = event.as_ref();

        // These should match `new Event`.
        assert!(event.bubbles());
        assert!(event.cancelable());
        assert!(event.composed());

        // The default behavior not initially prevented, but after
        // we call `prevent_default` it better be.
        assert!(!event.default_prevented());
        event.prevent_default();
        assert!(event.default_prevented());
    })
}