took a look at w3cshools example. Implemented exactly the same code on my environment. Firefox was performing the transformation as expected Internet Explorer (IE) all versions were failing and returning error:
Webpage error details User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; eSobiSubscriber 2.0.4.16; [...]