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From: "Christoph M. Becker" <cmbecker69@arcor.de>
Newsgroups: comp.lang.javascript
Subject: Re: Flow of execution
Date: Mon, 11 Apr 2016 10:15:55 +0200
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On 10.04.2016 at 11:58, emf wrote:

> If I add an alert at the end of the following function (from
> hmf.neocities.org/ix/is5.html):
> 
> window.onload = function () {
>     "use strict";
>     document.getElementById("start").onclick = function () {
>         requestFullScreen();
>         init();
>         alert("!"); // added alert
>     };
> };
> 
> I would expect that when the Start button is clicked first the
> requestFullScreen() would execute, then the init(), and when that one
> has finished executing, the alert would come up. But obviously my
> reasoning is wrong, because the alert appears immediately after the html
> is loaded.

<https://developer.mozilla.org/de/docs/Web/API/Element/requestFullscreen> says
(emphasis mine):

| The Element.requestFullscreen() method issues an *asynchronous*
| request to make the element be displayed full-screen.

The full specification of Element.requestFullScreen() clarifies the
details:
<https://fullscreen.spec.whatwg.org/#dom-element-requestfullscreen>.

-- 
Christoph M. Becker