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Mark Phillips13,124 Points
You can just download the project files for each lesson (usually index.html & myscript.js) and drag them to your browser icon to open them in the browser easily.
You can also go over to a site like CodePen and use that to re-create the contents of the files there for immediate results.
Florian Goussin8,925 Points
Then you just have to open your html file in the browser.