From the Web Designer Help (Groups):Converting Text To Be A Graphic
As mentioned above only a very limited number of fonts are available in web browsers. If you want to use a different font on a button or, say, as a heading, you can do this by ensuring it is converted to a graphic, and all you need to do is group the object to make this happen automatically. You can still edit the text inside the group, but groups are automatically converted into a graphic when the website is exported.
Simply select the text, then Arrange > Group (Ctrl+G). This applies to any of the three text formats.
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