Creates a temporary copy of the current document in HTML format, opens the system default Web browser, and displays the HTML file in the Web browser.
Choose File - Preview in Web Browser.
The HTML formatted copy is written to the temporary files folder that you can select in Tools - Options - Office - Paths. When you quit Office, the HTML file will be deleted.
You can set the HTML export filter options by choosing Tools - Options - Load/Save - HTML Compatibility.