I'm not entirely sure showing the code between <head> tags is going to show quality. What's your aversion to showing an actual example site you've completed in the past and it's source code (frontend html)
What's there to stop people from copying his SC then?
But I do agree - he has to take that risk and show a fully functional website - IF he wants to show a working sample - thats how it works.
If it's a public facing site there's nothing stopping anyone from stealing the SC.
Besides, it's only frontend code, not backend code. That can't be stolen.
