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Help:RichText editor - Font sizes
Although PetroWiki has strict font formatting in place a few additional font sizes are available.
In PetroWiki the Size determines how big or small a font used in the document text will be.
To change a font size for a text fragment, open the menu by clicking the button on the toolbar. The font size drop-down list contains a number of sizes that you can use. To make the choice easier, the items of the list are displayed in a font size that they represent, giving you a preview of what the text will look like.
A font size can be applied to the whole document, a paragraph, or a text fragment of arbitrary length — even a single letter. Do note, however, that for aesthetic and readability reasons it is recommended not to combine too many different font sizes in one document.