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I am following along with this video typing the same code in Workspace and I am not returning the same output when I click on the "preview workspace" icon. I am saving the document to Workspace prior to clicking the icon. It is very basic code that I typed letter for letter.
The code generates a blank html page with a white rectangular box at the top that may be for a header element, on the standard html white background. In the video, the alert script generated a message prompt, where I did not see any message prompt when I executed my code.
Codepen will show the alert message promt only once after the first time you saved your pen. You have to refresh your page to display the prompt again. I hope this helps, check this screenshot: http://cl.ly/h2du