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Identifying Installed Fonts [webreference.com]
The script would be particularly useful in a web application or Intranet where you could control what user agents and O/S are involved. But I must admit, my inner geek is very happy with this toy and I'm likely to experiment on a general traffic web page anyway.
As they mention in the article, there are TWO issues involved:
1) Is the font installed
2) Can the browser display that font
It's question two where the fuzz comes in for me. I know that browsers download with their own "native" versions of fonts. 12px Arial is a different size in different browsers, not because they count pixels differently but because they actually use different fonts that are similarly named. And all browsers cannot display all types of fonts, even if they are installed.
I've been very unadventurous with fonts and font-families so the information never caught my attention until recently. Something new to learn about.