Hi Leo,

I added the bodyClass to an existing QWP I made like this:

var qwpDataset = new LABKEY.QueryWebPart({
             bodyClass: 'dataset-body',
             queryName: <some query>,
             schemaName: <some schema>,
             renderTo: <dome div id or el>
             });
   qwpDataset.render( <dome div id or el> );

Then I ran the following in the Google Developer Console:

$$(".dataset-body")

And got actual results (see screenshot).

Can you re-try it with the double $$ and double quotes?

Regards,

Jon