My desktop environment is GNOME 2.30.2. I'm not sure if this question is GNOME-specific.
I know that going to System->Preferences->Appearance->Fonts will let me set the default fonts for various areas. For example, my "Window title font" is Sans bold of size 10. However, I also know that the Sans font does not contain all of the characters in, say the Basic Multilingual Plane. Therefore if I go to a site such as http://www.google.com.hk/imghp?hl=zh-tw&tab=wi and I do not have the proper fonts installed, the Window title will contain box characters.
My question is, if I DO have the proper fonts installed, how does the system choose which font to use for the characters that are not in Sans? For example I could have ten fonts that have the appropriate characters in them - which one is chosen?
Thanks in advance.