css select dropdown bold on some 's

Question

On a select dropdown, I need to make certain items \'strong/bold\'.

How can I do this?

Example of what I ideally require:

Answer 1

You actually can't.

The closest thing (you can't choose a bold item)

 
    Volvo
    Saab
  
  
    Mercedes
    Audi
  

Which gives you this:

http://www.w3schools.com/tags/tryit.asp?filename=tryhtml_optgroup

You can also build one of your own but it won't be input an input tag (you should use inputs of your own).