A problem of running demos

Hi I am new to web intents and very interested in this topic.

I was trying to running the demos and examples on http://webintents.org/.
But it always pops up the "complete action using" dialog. Is that because I
am using Chrome on Gentoo? Do I have to install some extra plugins or
extensions? Can anyone help with this?

BTW, the demos is working on my Windows and Android.

Thanks

Cheng Zheng