It actually even works when it is in a template. All that happens is the "Clean up CSS" dialog comes up since some email clients don't play nice with padding. You can always click ...
I just did it successfully in an email.I opened an editable section, clicked HTML, then added:<div id="testMe" style="padding-left: 40px;">Test Text</div>Worked fine.
I can help you if you explain what you're trying to do.If you have a CO syncing to Marketo, you can just access it in an email script like this:${custom_object_name.get(0).custom_o...
There isn't sample code on that blog post but here is what it would look like (also make sure the "app-aba" part of the url is aligned with what it is for your subscription):
<form...