It will launch when you double-click an HTML file. However, you may prefer to run an HTML file in a specific browser -- for example, Firefox may contain debugging or design tools that you use ...

3] Run the HTML file There is not much to do here in terms of running your newly created HTML file. All you have to do is right-click on the file, then select Open .

How to Execute a File in a MacBook Terminal. The operating system your MacBook runs, OS X, is built on top of UNIX, and Terminal provides you with access to the underlying UNIX system commands.