I have seen a type of browser which Apple spits out, for example, when connecting to hotel WiFi's. They seem to be a pop-up window without any specific application.
I find Github's screenshots to be displayed in the same way – Example. How do I achieve this to open any URL in a similar fashion?
Purpose: This would be a clean way to take screenshots etc.
Best Answer
One way to accomplish something similar is to use the Website Popup workflow in Automator.
Modify the settings in each workflow to your preference. The popup can be then captured for screen shots.
From the Mac OS X Automation website:
Sample using "Website" in a Wikipedia search workflow: