Hi
I am trying to add the appropriate css link in the head section of cassiopeia with the free version of Sourcerer - I do have other Regular Labs items as PRO versions. For reference I do the documentation for the jDownloads component
Using your example the code entered is as below:
Most probably the content you are placing the {source} tags in, is not being passed through the prepare content event.
This means that the time Sourcerer gets to see and handle the {source} tags, the head of the html document is already rendered and fixed.
If you want to do this in a component, you could for instance place this code in a module (type: Custom) and switch on the Prepare Content option in that module.