Arial is a built-in font. Back up all data. Launch the Font Book application and validate all fonts. You must select the fonts in order to validate them. See the built-in help and the support article linked below for instructions.

Introduction Here you can find the list with the standard set of fonts common to all versions of Windows and their Mac substitutes, referred sometimes as 'browser safe fonts'. This is the reference I use when making web pages and I expect you will find it useful too.
If you are new to web design, maybe you are thinking: 'Why I have to limit to that small set of fonts? I have a large collection of nice fonts in my computer'. Well, as seasoned web designers already know, browsers can use only the fonts installed in each computer, so it means that every visitor of your web page needs to have all the fonts you want to use installed in his/her computer. Of course, different people will have different fonts installed, and thus come the need of a standard set of fonts.
Fortunately, CSS allows set several values for the, which eases the task a bit. If you want to know how the fonts are displayed in other OS's or browsers than yours, after the table you can find of this page in different systems and browsers. Also, you can take a look to the. The list First, a few introductory notes: • The names in grey are the generic family of each font. • In some cases the Mac equivalent is the same font, since Mac OS X also includes some of the fonts shipped with Windows.

• The notes at the bottom contains specific information about some of the fonts. 1 Georgia and Trebuchet MS are bundled with Windows 2000/XP and they are also included in the IE font pack (and bundled with other MS applications), so they are quite common in Windows 98 systems. 2 Symbolic fonts are only displayed in Internet Explorer, in other browsers a font substitute is used instead (although the Symbol font does work in Opera and the Webdings works in Safari). 3 Book Antiqua is almost exactly the same font that Palatino Linotype, Palatino Linotype is included in Windows 2000/XP while Book Antiqua was bundled with Windows 98.