Where can I check the language coverage and characters within a font?

If you scroll to the bottom of the page for any font family then you will see a list of the scripts that the font covers (in the 'Details' tab).  The details tab will list both script support and language support. The language support information is provided by the foundry and we are unable to verify its validity. Some experts disagree with what constitutes full language support for some cases. Our type testers will show you if the font has the characters or not. If not, they currently show up in the default browser font.