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Support for various features in gedit

I'm currently creating a website for myself in HTML 5, and I've noticed that in the tutorials I'm watching, Notepad++ has little + or - boxes next to the line number which allow for elements of the website to be collapsible. For example, if I pressed the - box next to the section, it would collapse the entire section, and if I pressed +, it would reappear. Is something like this possible in GEdit, since things are starting to get crowded and it would be extremely helpful if that was possible.

If not, can someone direct me to a text editor that does have it (i.e. an alternative to Notepad++ which has about the same features) and works in Ubuntu?