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I have setup a dev environment with Visual Studio 2010, IIS and ASP.NET MVC3 for the widget provider. I am using IE9 and google chrome 15.0. to test the Publisher.

I am testing the async method with the following code :
<!doctype html >

script is loading asynchronously ... (only in HTML5 compatible Web Browsers)

<script async src=""></script>

page has finished rendering


the async scenario works only in Google Chrome and NOT in IE9.
if you slightly change the script element to :
<script async defer src=""></script>
then it works in BOTH IE9 and Chrome.

Best regards
Henri d'Orgeval
benvinegar (68) [Avatar] Offline
Re: 2.2.2 Asynchronous script include
The "defer" attribute is slightly different than async. It downloads the script file asynchronously, but doesn't execute that script until the entire document has been parsed (whereas async scripts execute immediately after they're downloaded). It also preserves execution order against other scripts that declare the defer attribute.

But you're right - IE doesn't support async until IE10 (according to this: If we've made that mistake in the book, we'll correct it. We should also mention defer, at least in passing.