www.xfce.org is not serving the primary fonts it is using
The webpage CSS is selecting fonts which it is not serving. That is a bad practice. I.e, if you have this in the font selector: font-family: "Bitstream Vera Sans","Lucida Grande","Lucida Sans Unicode",Helvetica,Arial,Verdana,sans-serif; Then the webpage should serve at least the font "Bitstream Vera Sans" from its own servers. Otherwise, page visitors don't all see the same font, especially when the first specified font is not a "web-safe font", and Bitstream Vera is not web-safe, i.e. it is likely that a large proportion of visitors don't have the font installed on their system. Since fonts typically have different internal sizes, this causes further inconsistencies in positioning of webpage elements. Font data sizes generally range from 11 kB for the basic charset, 20 kB for a common charset, and 100 kB for a relatively complete charset. Basic charsets are more than sufficient for title fonts and similar, while the other two can be used for body text and similar. So, if a webpage uses about three different fonts, then that would add approximately 60 kB extra data to download, which is not that much. The only catch is that reducing the font to a small charset (called "subsetting") is not allowed by licenses of some fonts, so one should always check the font license and how to comply with it in the case of subsetting, before selecting a font for a webpage.
issue