In-page contact form is not displayed

Are you planning to create a nice site, where you are going to use collapsing forms which are expanding on click with included LiveAgent contact widget?

It is possible without a problem. However be aware using of Display: none; function is not the correct way. It will cause the problem with the displaying and In-page contact will be still hidden. Please do not use: 
Display: none;
attribute for the hiding of content. Instead of Display: none; use attributes
height:0px; overflow:hidden
And for next displaying the collapsed section of the content use attribute
height: auto;

That is it! :)