Code patch by Roger Serwy.

This is a behavior change: before this leading and trailing spaces were
stripped from ASCII parts, now they are preserved.  Without this fix we didn't
parse the examples in the RFC correctly, so I think breaking backward
compatibility here is justified.

Patch by Ralf Schlatterbeck.

Use a threshold of 20 ms instead of 10 ms.

Initial patch by Michael Driscoll, I added the example.

Initial patch by Michael Driscoll, I added the example.

but this is more readable.

Includes exposing a doctype handler from expat through pyexpat.

the code are unnecessary.

Obsolete 2.x method.

Thanks to Nick Coghlan for pointing out that I'd forgotten about class
decorators.