How can you tell if the fonts on dafont.com are web safe or not? Thanks

You can't unless the font is (also) offered as a webfont. And then still the license applies.

what do you mean by "web safe" ?

I think that the general interpretation of "web safe" is that you may specify them via CSS (or HTML - shudder) without any of the newer font technologies, and have most people see them.

In which case the answer is no. There are very few web-safe fonts (basically fonts present on 80%+ of devices for a given OS), since the bit where uploading a font here magically installs it on every computer worldwide doesn't seem to be working yet. :-)

See the various sites devoted to creating CSS font stacks to see what the web-safe fonts are.