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Christoefel Champ1,008 Points
I have save my work. changes didn't happen after i click preview. The new tab written "Argh".
Help on using workspaces
Steven Parker216,175 Points
It sounds like you covered both of the points that are easy to forget: saving your changes and refreshing your preview.
The preview normally displays the content of the index.html file. Were you working in that file, or did you create a new file to work in? If it's a new file, you'll need to add the name of your file to the end of the workspace preview URL in your browser window, or move to it using a link you have added to the index.html file.
Roberto Gallardo1,772 Points
You need to refresh your browser tab. Just press the F5 key when the "Argh" tab is displayed on your screen.