Preview mode
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Show Preview
Show an HTML preview of your document, press Command-Option-P, or move the cursor to the left of the window and press Preview button (as shown below).
Close Preview
Press the Escape-key to close the document Preview and return to Writing mode, or move the cursor to the left of the window and press the Close Preview button (as shown below).
You can also use the same keyboard shortcut (Command-Option-P) to close Preview mode as you can to show the Preview.
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